10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________________________________

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period ended September 30, 2021

Or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number: 1-11607

DTE Energy Company

Michigan	38-3217752
(State or other jurisdiction of incorporation or organization)	(I.R.S Employer Identification No.)

Commission File Number: 1-2198

DTE Electric Company

Michigan	38-0478650
(State or other jurisdiction of incorporation or organization)	(I.R.S Employer Identification No.)

Registrants address of principal executive offices: One Energy Plaza, Detroit, Michigan 48226-1279

Registrants telephone number, including area code: (313) 235-4000

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol(s)	Name of Exchange on which Registered
Common stock, without par value	DTE	New York Stock Exchange
2016 Series F 6.00% Junior Subordinated Debentures due 2076	DTY	New York Stock Exchange
2017 Series E 5.25% Junior Subordinated Debentures due 2077	DTW	New York Stock Exchange
2019 6.25% Corporate Units	DTP	New York Stock Exchange
2020 Series G 4.375% Junior Subordinated Debentures due 2080	DTB	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

DTE Energy Company (DTE Energy) Yes ☒ No ☐ DTE Electric Company (DTE Electric) Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

DTE Energy Yes ☒ No ☐ DTE Electric Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

DTE Energy	Large accelerated filer	Accelerated filer	Non-accelerated filer	Smaller reporting company	Emerging growth company
	☒	☐	☐	☐	☐
DTE Electric	Large accelerated filer	Accelerated filer	Non-accelerated filer	Smaller reporting company	Emerging growth company
	☐	☐	☒	☐	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

DTE Energy Yes ☐ No ☒ DTE Electric Yes ☐ No ☒

Number of shares of Common Stock outstanding at September 30, 2021:

Registrant	Description	Shares
DTE Energy	Common Stock, without par value	193,727,278
DTE Electric	Common Stock, $10 par value, indirectly-owned by DTE Energy	138,632,324

This combined Form 10-Q is filed separately by two registrants: DTE Energy and DTE Electric. Information contained herein relating to any individual registrant is filed by such registrant solely on its own behalf. DTE Electric makes no representation as to information relating exclusively to DTE Energy.

DTE Electric, an indirect wholly-owned subsidiary of DTE Energy, meets the conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q and is therefore filing this form with the reduced disclosure format specified in General Instructions H(2) of Form 10-Q.

TABLE OF CONTENTS

		Page
	Definitions	1
	Filing Format	3
	Forward-Looking Statements	3
PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements
	DTE Energy Consolidated Financial Statements (Unaudited)	5
	DTE Electric Consolidated Financial Statements (Unaudited)	12
	Combined Notes to Consolidated Financial Statements (Unaudited)	18
	Note 1 — Organization and Basis of Presentation	18
	Note 2 — Significant Accounting Policies	21
	Note 3 — New Accounting Pronouncements	25
	Note 4 — Dispositions and Impairments	26
	Note 5 — Revenue	30
	Note 6 — Regulatory Matters	32
	Note 7 — Common Stock and Earnings Per Share	33
	Note 8 — Fair Value	35
	Note 9 — Financial and Other Derivative Instruments	42
	Note 10 — Long-Term Debt	47
	Note 11 — Short-Term Credit Arrangements and Borrowings	48
	Note 12 — Leases	49
	Note 13 — Commitments and Contingencies	50
	Note 14 — Retirement Benefits and Trusteed Assets	55
	Note 15 — Segment and Related Information	56
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	58
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	74
Item 4.	Controls and Procedures	76
PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	77
Item 1A.	Risk Factors	77
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	77
Item 6.	Exhibits	78
	Signatures	79

DEFINITIONS

ACE	Affordable Clean Energy
AFUDC	Allowance for Funds Used During Construction
AMV	Applicable Market Value
ASU	Accounting Standards Update issued by the FASB
CAD	Canadian Dollar (C$)
CARB	California Air Resources Board that administers California's Low Carbon Fuel Standard
CARES Act	Coronavirus Aid, Relief, and Economic Security Act enacted in March 2020 to assist individuals and employers with the impacts of the COVID-19 pandemic, including certain tax relief provisions
CCR	Coal Combustion Residuals
CFTC	U.S. Commodity Futures Trading Commission
COVID-19	Coronavirus disease of 2019
DTE Electric	DTE Electric Company (an indirect wholly-owned subsidiary of DTE Energy) and subsidiary companies
DTE Energy	DTE Energy Company, directly or indirectly the parent of DTE Electric, DTE Gas, and numerous non-utility subsidiaries
DTE Gas	DTE Gas Company (an indirect wholly-owned subsidiary of DTE Energy) and subsidiary companies
DTE Sustainable Generation	DTE Sustainable Generation Holdings, LLC (an indirect wholly-owned subsidiary of DTE Energy) and subsidiary companies
DT Midstream	DT Midstream, Inc., formerly DTE Energy's natural gas pipeline, storage, and gathering non-utility business comprising the Gas Storage and Pipelines segment and certain DTE Energy holding company activity in the Corporate and Other segment, which separated from DTE Energy and became an independent public company on July 1, 2021
EGLE	Michigan Department of Environment, Great Lakes, and Energy, formerly known as Michigan Department of Environmental Quality
EGU	Electric Generating Unit
ELG	Effluent Limitations Guidelines
EPA	U.S. Environmental Protection Agency
Equity units	DTE Energy's 2019 equity units issued in November 2019, which were used to finance the Gas Storage and Pipelines acquisition on December 4, 2019
ERCOT	Electric Reliability Council of Texas, the independent power market operator for substantially all of the Texas power market
EWR	Energy Waste Reduction program, which includes a mechanism authorized by the MPSC allowing DTE Electric and DTE Gas to recover through rates certain costs relating to energy waste reduction
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
FGD	Flue Gas Desulfurization
FOV	Finding of Violation
FTRs	Financial Transmission Rights are financial instruments that entitle the holder to receive payments related to costs incurred for congestion on the transmission grid
GCR	A Gas Cost Recovery mechanism authorized by the MPSC that allows DTE Gas to recover through rates its natural gas costs
GHGs	Greenhouse gases

1

DEFINITIONS

Green Bonds	A financing option to fund projects that have a positive environmental impact based upon a specified set of criteria. The proceeds are required to be used for eligible green expenditures
LIBOR	London Inter-Bank Offered Rates
MGP	Manufactured Gas Plant
MPSC	Michigan Public Service Commission
MTM	Mark-to-market
NAV	Net Asset Value
NEXUS	NEXUS Gas Transmission, LLC, a joint venture in which DTE Energy previously owned a 50% partnership interest that separated with DT Midstream effective July 1, 2021
Non-utility	An entity that is not a public utility. Its conditions of service, prices of goods and services, and other operating related matters are not directly regulated by the MPSC
NOX	Nitrogen Oxides
NPDES	National Pollutant Discharge Elimination System
NRC	U.S. Nuclear Regulatory Commission
Production tax credits	Tax credits as authorized under Sections 45K and 45 of the Internal Revenue Code that are designed to stimulate investment in and development of alternate fuel sources. The amount of a production tax credit can vary each year as determined by the Internal Revenue Service
PSCR	A Power Supply Cost Recovery mechanism authorized by the MPSC that allows DTE Electric to recover through rates its fuel, fuel-related, and purchased power costs
REC	Renewable Energy Credit
REF	Reduced Emissions Fuel
Registrants	DTE Energy and DTE Electric
Retail access	Michigan legislation provided customers the option of access to alternative suppliers for electricity and natural gas
RPS	Renewable Portfolio Standard program, which includes a mechanism authorized by the MPSC allowing DTE Electric to recover through rates its renewable energy costs
RSN	Remarketable Senior Note
SGG	Stonewall Gas Gathering is a midstream natural gas asset that was previously owned 85% by DTE Energy and separated with DT Midstream effective July 1, 2021
SIP	State Implementation Plan
SO2	Sulfur Dioxide
TCJA	Tax Cuts and Jobs Act of 2017, which reduced the corporate Federal income tax rate from 35% to 21%
Topic 606	FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, as amended
VIE	Variable Interest Entity

Units of Measurement
Bcf	Billion cubic feet of natural gas
BTU	British thermal unit, heat value (energy content) of fuel
MMBtu	One million BTU
MWh	Megawatt-hour of electricity

2

FILING FORMAT

This combined Form 10-Q is separately filed by DTE Energy and DTE Electric. Information in this combined Form 10-Q relating to each individual Registrant is filed by such Registrant on its own behalf. DTE Electric makes no representation regarding information relating to any other companies affiliated with DTE Energy other than its own subsidiaries. Neither DTE Energy, nor any of DTE Energy’s other subsidiaries (other than DTE Electric), has any obligation in respect of DTE Electric's debt securities, and holders of such debt securities should not consider the financial resources or results of operations of DTE Energy nor any of DTE Energy’s other subsidiaries (other than DTE Electric and its own subsidiaries (in relevant circumstances)) in making a decision with respect to DTE Electric's debt securities. Similarly, none of DTE Electric nor any other subsidiary of DTE Energy has any obligation in respect to debt securities of DTE Energy. This combined Form 10-Q should be read in its entirety. No one section of this combined Form 10-Q deals with all aspects of the subject matter of this combined Form 10-Q. This combined Form 10-Q should be read in conjunction with the Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements and with Management's Discussion and Analysis included in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.

FORWARD-LOOKING STATEMENTS

Certain information presented herein includes "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 with respect to the financial condition, results of operations, and businesses of the Registrants. Words such as "anticipate," "believe," "expect," "may," "could," "projected," "aspiration," "plans," and "goals" signify forward-looking statements. Forward-looking statements are not guarantees of future results and conditions, but rather are subject to numerous assumptions, risks, and uncertainties that may cause actual future results to be materially different from those contemplated, projected, estimated, or budgeted. Many factors may impact forward-looking statements of the Registrants including, but not limited to, the following:

•Risks related to the separation of DT Midstream, including that providing DT Midstream with transition services could adversely affect our business and that the transaction may not achieve some or all of the anticipated benefits;

•the duration and impact of the COVID-19 pandemic on the Registrants and customers;

•impact of regulation by the EPA, EGLE, the FERC, the MPSC, the NRC, and for DTE Energy, the CFTC and CARB, as well as other applicable governmental proceedings and regulations, including any associated impact on rate structures;

•the amount and timing of cost recovery allowed as a result of regulatory proceedings, related appeals, or new legislation, including legislative amendments and retail access programs;

•economic conditions and population changes in the Registrants' geographic area resulting in changes in demand, customer conservation, and thefts of electricity and, for DTE Energy, natural gas;

•the operational failure of electric or gas distribution systems or infrastructure;

•impact of volatility in prices in international steel markets on the operations of DTE Vantage (formerly Power and Industrial Projects);

•the risk of a major safety incident;

•environmental issues, laws, regulations, and the increasing costs of remediation and compliance, including actual and potential new federal and state requirements;

•the cost of protecting assets and customer data against, or damage due to, cyber incidents and terrorism;

•health, safety, financial, environmental, and regulatory risks associated with ownership and operation of nuclear facilities;

•volatility in commodity markets, deviations in weather, and related risks impacting the results of DTE Energy's energy trading operations;

•changes in the cost and availability of coal and other raw materials, purchased power, and natural gas;

•advances in technology that produce power, store power, or reduce power consumption;

3

•changes in the financial condition of significant customers and strategic partners;

•the potential for losses on investments, including nuclear decommissioning and benefit plan assets and the related increases in future expense and contributions;

•access to capital markets and the results of other financing efforts which can be affected by credit agency ratings;

•instability in capital markets which could impact availability of short and long-term financing;

•the timing and extent of changes in interest rates;

•the level of borrowings;

•the potential for increased costs or delays in completion of significant capital projects;

•changes in, and application of, federal, state, and local tax laws and their interpretations, including the Internal Revenue Code, regulations, rulings, court proceedings, and audits;

•the effects of weather and other natural phenomena on operations and sales to customers, and purchases from suppliers;

•unplanned outages;

•employee relations and the impact of collective bargaining agreements;

•the availability, cost, coverage, and terms of insurance and stability of insurance providers;

•cost reduction efforts and the maximization of plant and distribution system performance;

•the effects of competition;

•changes in and application of accounting standards and financial reporting regulations;

•changes in federal or state laws and their interpretation with respect to regulation, energy policy, and other business issues;

•contract disputes, binding arbitration, litigation, and related appeals; and

•the risks discussed in the Registrants' public filings with the Securities and Exchange Commission.

New factors emerge from time to time. The Registrants cannot predict what factors may arise or how such factors may cause results to differ materially from those contained in any forward-looking statement. Any forward-looking statements speak only as of the date on which such statements are made. The Registrants undertake no obligation to update any forward-looking statement to reflect events or circumstances after the date on which such statement is made or to reflect the occurrence of unanticipated events.

4

Part I — Financial Information

Item 1. Financial Statements

DTE Energy Company

Consolidated Statements of Operations (Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions, except per share amounts)
Operating Revenues
Utility operations	$	1,875	$	1,844	$	5,483	$	5,119
Non-utility operations	1,840		1,236		4,834		3,224
	3,715		3,080		10,317		8,343
Operating Expenses
Fuel, purchased power, and gas — utility	477		455		1,411		1,296
Fuel, purchased power, gas, and other — non-utility	1,766		1,174		4,708		2,923
Operation and maintenance	615		556		1,750		1,651
Depreciation and amortization	344		318		1,010		949
Taxes other than income	106		100		329		294
Asset (gains) losses and impairments, net	2		(2)		29		43
	3,310		2,601		9,237		7,156
Operating Income	405		479		1,080		1,187
Other (Income) and Deductions
Interest expense	156		149		477		450
Interest income	(6)		(11)		(16)		(25)
Non-operating retirement benefits, net	3		5		10		20
Loss on extinguishment of debt	376		—		384		—
Other income	(90)		(75)		(187)		(188)
Other expenses	30		20		50		72
	469		88		718		329
Income (Loss) Before Income Taxes	(64)		391		362		858
Income Tax Expense (Benefit) (Note 2)	(119)		21		(124)		19
Net Income from Continuing Operations	55		370		486		839
Income (Loss) from Discontinued Operations, Net of Taxes (Note 4)	(33)		107		112		257
Net Income	22		477		598		1,096
Less: Net Income (Loss) Attributable to Noncontrolling Interests
Continuing operations	(3)		(2)		(9)		(5)
Discontinued operations	—		3		6		8
Net Income Attributable to DTE Energy Company	$	25	$	476	$	601	$	1,093
Basic Earnings per Common Share
Continuing operations	0.30		1.93		2.55		4.37
Discontinued operations	(0.17)		0.54		0.55		1.30
Total	$	0.13	$	2.47	$	3.10	$	5.67
Diluted Earnings per Common Share
Continuing operations	0.30		1.92		2.55		4.37
Discontinued operations	(0.17)		0.54		0.55		1.29
Total	$	0.13	$	2.46	$	3.10	$	5.66
Weighted Average Common Shares Outstanding
Basic	193		193		193		192
Diluted	194		193		194		193

See Combined Notes to Consolidated Financial Statements (Unaudited)

5

DTE Energy Company

Consolidated Statements of Comprehensive Income (Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Income	$	22	$	477	$	598	$	1,096
Other comprehensive income, net of tax:
Benefit obligations, net of taxes of $1, $1, $2, and $3, respectively	2		2		5		7
Net unrealized gains (losses) on derivatives, net of taxes of $1, $—, $2, and $1, respectively	4		1		6		3
Other comprehensive income	6		3		11		10
Comprehensive income	28		480		609		1,106
Less: Comprehensive income (loss) attributable to noncontrolling interests	(3)		1		(3)		3
Comprehensive Income Attributable to DTE Energy Company	$	31	$	479	$	612	$	1,103

See Combined Notes to Consolidated Financial Statements (Unaudited)

6

DTE Energy Company

Consolidated Statements of Financial Position (Unaudited)

	September 30,		December 31,
	2021		2020
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	54	$	472
Restricted cash	2		2
Accounts receivable (less allowance for doubtful accounts of $102 and $104, respectively)
Customer	1,522		1,542
Other	170		127
Inventories
Fuel and gas	398		335
Materials, supplies, and other	517		373
Derivative assets	347		116
Regulatory assets	187		129
Other	297		185
Current assets of discontinued operations	—		217
	3,494		3,498
Investments
Nuclear decommissioning trust funds	2,007		1,855
Investments in equity method investees	186		177
Other	187		196
	2,380		2,228
Property
Property, plant, and equipment	36,134		34,016
Accumulated depreciation and amortization	(9,977)		(9,517)
	26,157		24,499
Other Assets
Goodwill	1,993		1,993
Regulatory assets	3,974		4,125
Intangible assets	181		199
Notes receivable	304		261
Derivative assets	81		40
Prepaid postretirement costs	620		561
Operating lease right-of-use assets	100		107
Other	151		126
Noncurrent assets of discontinued operations	—		7,859
	7,404		15,271
Total Assets	$	39,435	$	45,496

See Combined Notes to Consolidated Financial Statements (Unaudited)

7

DTE Energy Company

Consolidated Statements of Financial Position (Unaudited) — (Continued)

	September 30,		December 31,
	2021		2020
	(In millions, except shares)
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	1,365	$	1,000
Accrued interest	147		158
Dividends payable	160		210
Short-term borrowings	361		38
Current portion long-term debt, including finance leases	324		469
Derivative liabilities	465		68
Regulatory liabilities	41		39
Operating lease liabilities	14		16
Other	556		594
Current liabilities of discontinued operations	—		99
	3,433		2,691
Long-Term Debt (net of current portion)
Mortgage bonds, notes, and other	16,022		17,802
Junior subordinated debentures	883		1,175
Finance lease liabilities	19		24
	16,924		19,001
Other Liabilities
Deferred income taxes	2,105		2,069
Regulatory liabilities	3,220		3,363
Asset retirement obligations	2,974		2,829
Unamortized investment tax credit	158		162
Derivative liabilities	244		60
Accrued pension liability	732		797
Accrued postretirement liability	398		407
Nuclear decommissioning	310		283
Operating lease liabilities	77		83
Other	281		326
Noncurrent liabilities of discontinued operations	—		836
	10,499		11,215
Commitments and Contingencies (Notes 6 and 13)
Equity
Common stock (No par value, 400,000,000 shares authorized, and 193,727,278 and 193,770,617 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively)	5,366		5,406
Retained earnings	3,317		7,156
Accumulated other comprehensive loss	(116)		(137)
Total DTE Energy Company Equity	8,567		12,425
Noncontrolling interests of continuing operations	12		10
Noncontrolling interests of discontinued operations	—		154
Total Equity	8,579		12,589
Total Liabilities and Equity	$	39,435	$	45,496

See Combined Notes to Consolidated Financial Statements (Unaudited)

8

DTE Energy Company

Consolidated Statements of Cash Flows (Unaudited)

	Nine Months Ended September 30,
	2021		2020
	(In millions)
Operating Activities
Net Income	$	598	$	1,096
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	1,092		1,059
Nuclear fuel amortization	44		22
Allowance for equity funds used during construction	(20)		(19)
Deferred income taxes	(36)		350
Equity earnings of equity method investees	(90)		(96)
Dividends from equity method investees	78		122
Loss on extinguishment of debt	384		—
Asset (gains) losses and impairments, net	46		44
Changes in assets and liabilities:
Accounts receivable, net	(8)		343
Inventories	(209)		(54)
Prepaid postretirement benefit costs	(59)		(56)
Accounts payable	225		(80)
Accrued pension liability	(65)		(126)
Accrued postretirement liability	(9)		—
Derivative assets and liabilities	309		15
Regulatory assets and liabilities	270		(30)
Other current and noncurrent assets and liabilities	(178)		191
Net cash from operating activities	2,372		2,781
Investing Activities
Plant and equipment expenditures — utility	(2,591)		(2,362)
Plant and equipment expenditures — non-utility	(109)		(526)
Acquisitions related to business combinations, net of cash acquired	—		(126)
Proceeds from sale of assets	2		7
Proceeds from sale of nuclear decommissioning trust fund assets	854		2,054
Investment in nuclear decommissioning trust funds	(853)		(2,051)
Distributions from equity method investees	11		6
Contributions to equity method investees	(7)		(32)
Notes receivable	(65)		(58)
Other	(22)		(5)
Net cash used for investing activities	(2,780)		(3,093)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	4,033		2,724
Redemption of long-term debt	(3,242)		(682)
Short-term borrowings, net	323		160
Repurchase of common stock	(66)		—
Dividends paid on common stock	(631)		(574)
Contributions from noncontrolling interests, principally REF entities	35		25
Distributions to noncontrolling interests	(33)		(27)
Acquisition related deferred payment, excluding accretion	—		(380)
Prepayment costs for extinguishment of long-term debt	(361)		—
Transfer of cash to DT Midstream at separation	(37)		—
Other	(73)		(65)
Net cash from (used for) financing activities	(52)		1,181
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	(460)		869
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	516		93
Cash, Cash Equivalents, and Restricted Cash at End of Period	$	56	$	962
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	$	386	$	282
Separation of DT Midstream net assets, excluding cash transferred	$	3,962	$	—

See Combined Notes to Consolidated Financial Statements (Unaudited)

9

DTE Energy Company

Consolidated Statements of Changes in Equity (Unaudited)

				Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interests
	Common Stock
	Shares	Amount								Total
	(Dollars in millions, shares in thousands)
Balance, December 31, 2020	193,771	$	5,406	$	7,156	$	(137)	$	164	$	12,589
Net Income	—	—		397		—		—		397
Dividends declared on common stock ($1.09 per Common Share)	—	—		(210)		—		—		(210)
Repurchase of common stock	(430)	(54)		—		—		—		(54)
Other comprehensive income, net of tax	—	—		—		3		—		3
Stock-based compensation, net distributions to noncontrolling interests, and other	386	(8)		(1)		—		(2)		(11)
Balance, March 31, 2021	193,727	$	5,344	$	7,342	$	(134)	$	162	$	12,714
Net Income	—	—		179		—		—		179
Dividends declared on common stock ($1.91 per Common Share)	—	—		(370)		—		—		(370)
Other comprehensive income, net of tax	—	—		—		2		—		2
Stock-based compensation, net distributions to noncontrolling interests, and other	25	17		(2)		—		(1)		14
Balance, June 30, 2021	193,752	$	5,361	$	7,149	$	(132)	$	161	$	12,539
Net Income (Loss)	—	—		25		—		(3)		22
Repurchase of common stock	(99)	(12)		—		—		—		(12)
Other comprehensive income, net of tax	—	—		—		6		—		6
Stock-based compensation, net contributions from noncontrolling interests, and other	74	17		1		—		5		23
Separation of DT Midstream	—	—		(3,858)		10		(151)		(3,999)
Balance, September 30, 2021	193,727	$	5,366	$	3,317	$	(116)	$	12	$	8,579

See Combined Notes to Consolidated Financial Statements (Unaudited)

10

DTE Energy Company

Consolidated Statements of Changes in Equity (Unaudited) — (Continued)

				Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interests
	Common Stock
	Shares	Amount								Total
	(Dollars in millions, shares in thousands)
Balance, December 31, 2019	192,209	$	5,233	$	6,587	$	(148)	$	164	$	11,836
Net Income	—	—		340		—		2		342
Dividends declared on common stock ($1.01 per Common Share)	—	—		(195)		—		—		(195)
Other comprehensive income, net of tax	—	—		—		3		—		3
Stock-based compensation, net distributions to noncontrolling interests, and other	403	2		—		—		—		2
Balance, March 31, 2020	192,612	$	5,235	$	6,732	$	(145)	$	166	$	11,988
Net Income	—	—		277		—		—		277
Dividends declared on common stock ($2.03 per Common Share)	—	—		(390)		—		—		(390)
Other comprehensive income, net of tax	—	—		—		4		—		4
Stock-based compensation, net contributions from noncontrolling interests, and other	39	12		(1)		—		2		13
Balance, June 30, 2020	192,651	$	5,247	$	6,618	$	(141)	$	168	$	11,892
Net Income	—	—		476		—		1		477
Issuance of common stock	98	11		—		—		—		11
Contribution of common stock to pension plan	694	82		—		—		—		82
Other comprehensive income, net of tax	—	—		—		3		—		3
Stock-based compensation, net distributions to noncontrolling interests, and other	117	29		(2)		—		(4)		23
Balance, September 30, 2020	193,560	$	5,369	$	7,092	$	(138)	$	165	$	12,488

See Combined Notes to Consolidated Financial Statements (Unaudited)

11

DTE Electric Company

Consolidated Statements of Operations (Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Utility operations	$	1,700	$	1,690	$	4,468	$	4,211
Operating Expenses
Fuel and purchased power — utility	462		451		1,185		1,090
Operation and maintenance	410		361		1,122		1,074
Depreciation and amortization	278		258		810		768
Taxes other than income	83		79		245		220
Asset (gains) losses and impairments, net	—		—		—		41
	1,233		1,149		3,362		3,193
Operating Income	467		541		1,106		1,018
Other (Income) and Deductions
Interest expense	84		83		251		249
Interest income	—		—		—		(2)
Non-operating retirement benefits, net	—		—		(1)		—
Other income	(14)		(18)		(52)		(68)
Other expenses	8		18		26		66
	78		83		224		245
Income Before Income Taxes	389		458		882		773
Income Tax Expense	45		58		92		96
Net Income	$	344	$	400	$	790	$	677

See Combined Notes to Consolidated Financial Statements (Unaudited)

12

DTE Electric Company

Consolidated Statements of Comprehensive Income (Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Income	$	344	$	400	$	790	$	677
Other comprehensive income	—		—		—		—
Comprehensive Income	$	344	$	400	$	790	$	677

See Combined Notes to Consolidated Financial Statements (Unaudited)

13

DTE Electric Company

Consolidated Statements of Financial Position (Unaudited)

	September 30,		December 31,
	2021		2020
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	18	$	16
Accounts receivable (less allowance for doubtful accounts of $55 and $57, respectively)
Customer	782		763
Affiliates	17		13
Other	64		62
Inventories
Fuel	175		187
Materials and supplies	320		292
Regulatory assets	178		123
Prepaid property tax	126		52
Other	43		19
	1,723		1,527
Investments
Nuclear decommissioning trust funds	2,007		1,855
Other	41		42
	2,048		1,897
Property
Property, plant, and equipment	28,014		26,171
Accumulated depreciation and amortization	(7,506)		(7,050)
	20,508		19,121
Other Assets
Regulatory assets	3,335		3,440
Intangible assets	3		11
Prepaid postretirement costs — affiliates	371		335
Operating lease right-of-use assets	67		75
Other	120		107
	3,896		3,968
Total Assets	$	28,175	$	26,513

See Combined Notes to Consolidated Financial Statements (Unaudited)

14

DTE Electric Company

Consolidated Statements of Financial Position (Unaudited) — (Continued)

	September 30,		December 31,
	2021		2020
	(In millions, except shares)
LIABILITIES AND SHAREHOLDER’S EQUITY
Current Liabilities
Accounts payable
Affiliates	$	64	$	62
Other	582		410
Accrued interest	87		91
Current portion long-term debt, including finance leases	322		468
Regulatory liabilities	36		18
Short-term borrowings
Affiliates	32		101
Other	159		—
Operating lease liabilities	11		11
Other	165		219
	1,458		1,380
Long-Term Debt (net of current portion)
Mortgage bonds, notes, and other	8,590		7,774
Finance lease liabilities	9		13
	8,599		7,787
Other Liabilities
Deferred income taxes	2,677		2,525
Regulatory liabilities	2,322		2,432
Asset retirement obligations	2,744		2,607
Unamortized investment tax credit	158		162
Nuclear decommissioning	310		283
Accrued pension liability — affiliates	697		731
Accrued postretirement liability — affiliates	378		384
Operating lease liabilities	49		56
Other	91		96
	9,426		9,276
Commitments and Contingencies (Notes 6 and 13)
Shareholder’s Equity
Common stock ($10 par value, 400,000,000 shares authorized, and 138,632,324 shares issued and outstanding for both periods)	5,720		5,447
Retained earnings	2,972		2,623
Total Shareholder’s Equity	8,692		8,070
Total Liabilities and Shareholder’s Equity	$	28,175	$	26,513

See Combined Notes to Consolidated Financial Statements (Unaudited)

15

DTE Electric Company

Consolidated Statements of Cash Flows (Unaudited)

	Nine Months Ended September 30,
	2021		2020
	(In millions)
Operating Activities
Net Income	$	790	$	677
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	810		768
Nuclear fuel amortization	44		22
Allowance for equity funds used during construction	(18)		(18)
Deferred income taxes	90		74
Asset (gains) losses and impairments, net	—		41
Changes in assets and liabilities:
Accounts receivable, net	(25)		(71)
Inventories	(19)		(30)
Accounts payable	40		37
Prepaid postretirement benefit costs — affiliates	(36)		—
Accrued pension liability — affiliates	(34)		(80)
Accrued postretirement liability — affiliates	(6)		(35)
Regulatory assets and liabilities	229		(79)
Other current and noncurrent assets and liabilities	(259)		(20)
Net cash from operating activities	1,606		1,286
Investing Activities
Plant and equipment expenditures	(2,152)		(1,981)
Proceeds from sale of nuclear decommissioning trust fund assets	854		2,054
Investment in nuclear decommissioning trust funds	(853)		(2,051)
Notes Receivable and Other	(22)		(14)
Net cash used for investing activities	(2,173)		(1,992)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	986		1,683
Redemption of long-term debt	(321)		(632)
Capital contribution by parent company	273		400
Short-term borrowings, net — affiliate	(69)		7
Short-term borrowings, net — other	159		(154)
Dividends paid on common stock	(441)		(404)
Other	(18)		(17)
Net cash from financing activities	569		883
Net Increase in Cash and Cash Equivalents	2		177
Cash and Cash Equivalents at Beginning of Period	16		12
Cash and Cash Equivalents at End of Period	$	18	$	189
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	$	307	$	141

See Combined Notes to Consolidated Financial Statements (Unaudited)

16

DTE Electric Company

Consolidated Statements of Changes in Shareholder's Equity (Unaudited)

				Additional Paid-in Capital		Retained Earnings
	Common Stock
	Shares	Amount						Total
	(Dollars in millions, shares in thousands)
Balance, December 31, 2020	138,632	$	1,386	$	4,061	$	2,623	$	8,070
Net Income	—	—		—		208		208
Dividends declared on common stock	—	—		—		(147)		(147)
Balance, March 31, 2021	138,632	$	1,386	$	4,061	$	2,684	$	8,131
Net Income	—	—		—		238		238
Dividends declared on common stock	—	—		—		(146)		(146)
Balance, June 30, 2021	138,632	$	1,386	$	4,061	$	2,776	$	8,223
Net Income	—	—		—		344		344
Dividends declared on common stock	—	—		—		(148)		(148)
Capital contribution by parent company	—	—		273		—		273
Balance, September 30, 2021	138,632	$	1,386	$	4,334	$	2,972	$	8,692

				Additional Paid-in Capital		Retained Earnings
	Common Stock
	Shares	Amount						Total
	(Dollars in millions, shares in thousands)
Balance, December 31, 2019	138,632	$	1,386	$	3,425	$	2,384	$	7,195
Net Income	—	—		—		94		94
Dividends declared on common stock	—	—		—		(135)		(135)
Balance, March 31, 2020	138,632	$	1,386	$	3,425	$	2,343	$	7,154
Net Income	—	—		—		183		183
Dividends declared on common stock	—	—		—		(134)		(134)
Balance, June 30, 2020	138,632	$	1,386	$	3,425	$	2,392	$	7,203
Net Income	—	—		—		400		400
Dividends declared on common stock	—	—		—		(135)		(135)
Capital contribution by parent company				400				400
Balance, September 30, 2020	138,632	$	1,386	$	3,825	$	2,657	$	7,868

See Combined Notes to Consolidated Financial Statements (Unaudited)

17

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited)

Index of Combined Notes to Consolidated Financial Statements (Unaudited)

The Combined Notes to Consolidated Financial Statements (Unaudited) are a combined presentation for DTE Energy and DTE Electric. The following list indicates the Registrant(s) to which each note applies:

Note 1	Organization and Basis of Presentation	DTE Energy and DTE Electric
Note 2	Significant Accounting Policies	DTE Energy and DTE Electric
Note 3	New Accounting Pronouncements	DTE Energy and DTE Electric
Note 4	Dispositions and Impairments	DTE Energy
Note 5	Revenue	DTE Energy and DTE Electric
Note 6	Regulatory Matters	DTE Energy and DTE Electric
Note 7	Common Stock and Earnings per Share	DTE Energy
Note 8	Fair Value	DTE Energy and DTE Electric
Note 9	Financial and Other Derivative Instruments	DTE Energy and DTE Electric
Note 10	Long-Term Debt	DTE Energy and DTE Electric
Note 11	Short-Term Credit Arrangements and Borrowings	DTE Energy and DTE Electric
Note 12	Leases	DTE Energy
Note 13	Commitments and Contingencies	DTE Energy and DTE Electric
Note 14	Retirement Benefits and Trusteed Assets	DTE Energy and DTE Electric
Note 15	Segment and Related Information	DTE Energy

NOTE 1 — ORGANIZATION AND BASIS OF PRESENTATION

Corporate Structure

DTE Energy owns the following businesses:

•DTE Electric is a public utility engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.3 million customers in southeastern Michigan;

•DTE Gas is a public utility engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million customers throughout Michigan and the sale of storage and transportation capacity; and

•Other businesses include (1) DTE Vantage, formerly DTE Energy's Power and Industrial Projects segment, which is primarily involved in providing industrial energy services, reduced emissions fuel projects, and renewable natural gas projects, and 2) energy marketing and trading operations.

DTE Electric and DTE Gas are regulated by the MPSC. Certain activities of DTE Electric and DTE Gas, as well as various other aspects of businesses under DTE Energy, are regulated by the FERC. In addition, the Registrants are regulated by other federal and state regulatory agencies including the NRC, the EPA, EGLE, and for DTE Energy, the CFTC and CARB.

Basis of Presentation

The Consolidated Financial Statements should be read in conjunction with the Combined Notes to Consolidated Financial Statements included in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.

The accompanying Consolidated Financial Statements of the Registrants are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Registrants' estimates.

18

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The Consolidated Financial Statements are unaudited but, in the Registrants' opinions, include all adjustments necessary to present a fair statement of the results for the interim periods. All adjustments are of a normal recurring nature, except as otherwise disclosed in these Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2021.

The information in these combined notes relates to each of the Registrants as noted in the Index of Combined Notes to Consolidated Financial Statements. However, DTE Electric does not make any representation as to information related solely to DTE Energy or the subsidiaries of DTE Energy other than itself.

Certain prior year balances for DTE Electric were reclassified to match the current year's Consolidated Financial Statements presentation.

Separation of DT Midstream

On July 1, 2021, DTE Energy completed the previously announced separation of its natural gas pipeline, storage and gathering non-utility business. Effective with the separation, DTE retains no ownership in the new company, DT Midstream, which was formerly comprised of DTE Energy's Gas Storage and Pipelines segment and also included certain DTE Energy holding company activity within the Corporate and Other segment. Gas Storage and Pipelines is no longer a reportable segment of DTE Energy, and financial results of DT Midstream are presented as Income from discontinued operations, net of taxes on DTE Energy's Consolidated Statements of Operations. Assets and liabilities of DT Midstream are also presented as discontinued operations on DTE Energy's Consolidated Statements of Financial Position. Prior periods have been recast to reflect this presentation.

No adjustments were made to the historical activity within the Consolidated Statements of Comprehensive Income, Consolidated Statements of Cash Flows, or the Consolidated Statements of Changes in Equity. Unless noted otherwise, discussion in the Notes to the Consolidated Financial Statements relate to continuing operations. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information regarding the separation of DT Midstream and discontinued operations.

Principles of Consolidation

The Registrants consolidate all majority-owned subsidiaries and investments in entities in which they have controlling influence. Non-majority owned investments are accounted for using the equity method when the Registrants are able to significantly influence the operating policies of the investee. When the Registrants do not influence the operating policies of an investee, the equity investment is valued at cost minus any impairments, if applicable. These Consolidated Financial Statements also reflect the Registrants' proportionate interests in certain jointly-owned utility plants. The Registrants eliminate all intercompany balances and transactions.

The Registrants evaluate whether an entity is a VIE whenever reconsideration events occur. The Registrants consolidate VIEs for which they are the primary beneficiary. If a Registrant is not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, a Registrant considers all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. The Registrants perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

During the third quarter of 2021, the Registrants performed reassessments of certain VIEs owned by DT Midstream. Upon the separation of DT Midstream, DTE Energy no longer owns any interest in SGG, owner and operator of certain midstream natural gas assets. Therefore, SGG has been removed from the amounts for DTE Energy's consolidated VIEs in the table below. Additionally, as a result of the separation of DT Midstream, DTE Energy no longer has an equity interest in NEXUS, owner of a 256-mile pipeline which transports shale gas to Ohio, Michigan, and Ontario market centers. DTE Energy has removed its equity investment in NEXUS from the amounts for its non-consolidated VIEs. The Registrants maintain a variable interest in NEXUS relating to DTE Electric's transportation services contract. Assets, liabilities, and earnings related to SGG and NEXUS are included in discontinued operations in the Consolidated Financial Statements.

19

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Legal entities within the DTE Vantage segment enter into long-term contractual arrangements with customers to supply energy-related products or services. The entities are generally designed to pass-through the commodity risk associated with these contracts to the customers, with DTE Energy retaining operational and customer default risk. These entities generally are VIEs and consolidated when DTE Energy is the primary beneficiary. In addition, DTE Energy has interests in certain VIEs through which control of all significant activities is shared with partners, and therefore are generally accounted for under the equity method.

The Registrants hold ownership interests in certain limited partnerships. The limited partnerships include investment funds which support regional development and economic growth, and an operational business providing energy-related products. These entities are generally VIEs as a result of certain characteristics of the limited partnership voting rights. The ownership interests are accounted for under the equity method as the Registrants are not the primary beneficiaries.

DTE Energy has variable interests in VIEs through certain of its long-term purchase and sale contracts. DTE Electric has variable interests in VIEs through certain of its long-term purchase contracts. As of September 30, 2021, the carrying amount of assets and liabilities in DTE Energy's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase and sale contracts are predominantly related to working capital accounts and generally represent the amounts owed by or to DTE Energy for the deliveries associated with the current billing cycle under the contracts. As of September 30, 2021, the carrying amount of assets and liabilities in DTE Electric's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase contracts are predominantly related to working capital accounts and generally represent the amounts owed by DTE Electric for the deliveries associated with the current billing cycle under the contracts. The Registrants have not provided any significant form of financial support associated with these long-term contracts. There is no material potential exposure to loss as a result of DTE Energy's variable interests through these long-term purchase and sale contracts. In addition, there is no material potential exposure to loss as a result of DTE Electric's variable interests through these long-term purchase contracts.

The maximum risk exposure for consolidated VIEs is reflected on the Registrants' Consolidated Statements of Financial Position and, for DTE Energy, in Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies," related to REF guarantees and indemnities. For non-consolidated VIEs, the maximum risk exposure of the Registrants is generally limited to their investment, notes receivable, future funding commitments, and amounts which DTE Energy has guaranteed.

The following table summarizes the major Consolidated Statements of Financial Position items for consolidated VIEs as of September 30, 2021 and December 31, 2020. All assets and liabilities of a consolidated VIE are presented where it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. VIEs, in which DTE Energy holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below.

Amounts for DTE Energy's consolidated VIEs are as follows:

	September 30, 2021		December 31, 2020
	(In millions)
ASSETS
Cash and cash equivalents	$	23	$	20
Accounts receivable	26		28
Inventories	45		107
Property, plant, and equipment, net	5		14
Notes receivable and other	67		33
	$	166	$	202
LIABILITIES
Accounts payable	$	21	$	22
Short-term borrowings	74		38
Other current and long-term liabilities	2		4
	$	97	$	64

20

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Amounts for DTE Energy's non-consolidated VIEs are as follows:

	September 30, 2021		December 31, 2020
	(In millions)
Investments in equity method investees	$	170	$	159
Notes receivable	$	16	$	21
Future funding commitments	$	3	$	6

NOTE 2 — SIGNIFICANT ACCOUNTING POLICIES

Other Income

The following is a summary of DTE Energy's Other income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Income from REF entities	$	57	$	43	$	102	$	95
Equity earnings of equity method investees	17		12		31		21
Contract services	6		7		21		20
Allowance for equity funds used during construction	7		6		20		19
Gains from rabbi trust securities(a)	—		2		4		24
Other	3		5		9		9
	$	90	$	75	$	187	$	188

_______________________________________

(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.

The following is a summary of DTE Electric's Other income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Contract services	$	6	$	7	$	21	$	20
Allowance for equity funds used during construction	6		6		18		18
Gains from rabbi trust securities allocated from DTE Energy(a)	—		2		4		24
Other	2		3		9		6
	$	14	$	18	$	52	$	68

_______________________________________

(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.

Changes in Accumulated Other Comprehensive Income (Loss)

Comprehensive income (loss) is the change in common shareholders' equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DTE Energy include changes in benefit obligations, consisting of deferred actuarial losses and prior service costs, unrealized gains and losses from derivatives accounted for as cash flow hedges, and foreign currency translation adjustments. DTE Energy releases income tax effects from accumulated other comprehensive income when the circumstances upon which they are premised cease to exist.

Changes in Accumulated other comprehensive income (loss) are presented in DTE Energy's Consolidated Statements of Changes in Equity and DTE Electric's Consolidated Statements of Changes in Shareholder's Equity. For DTE Energy, this includes a one-time reduction of $10 million in Accumulated other comprehensive loss due to the Separation of DT Midstream in the third quarter 2021. For the three and nine months ended months ended September 30, 2021 and 2020, reclassifications out of Accumulated other comprehensive income (loss) were not material.

21

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Income Taxes

The interim effective tax rates of the Registrants are as follows:

	Effective Tax Rate
	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
DTE Energy	186	%	5	%	(34)	%	2	%
DTE Electric	12	%	13	%	10	%	12	%

These tax rates are affected by estimated annual permanent items, including AFUDC equity, production tax credits, and other flow-through items, as well as discrete items that may occur in any given period, but are not consistent from period to period. DTE Energy's effective tax rates in 2021 have been significantly impacted by pre-tax losses in the third quarter, driven primarily by the loss on extinguishment of debt and reclassification of DT Midstream earnings to discontinued operations.

The 181% increase in DTE Energy's effective tax rate for the three months ended September 30, 2021 was primarily due to a deferred tax remeasurement of 133%, production tax credits of 51%, and amortization of the TCJA regulatory liability of 35%, partially offset by a valuation allowance of 29% and recognition of a deferred intercompany gain of 13%.

The 36% decrease in DTE Energy’s effective tax rate for the nine months ended September 30, 2021 was primarily due to a deferred tax remeasurement of 23%, production tax credits of 13%, and amortization of the TCJA regulatory liability of 9%, partially offset by the 2020 carryback of 2018 net operating losses due to the CARES Act of 4%, a valuation allowance of 4%, recognition of a deferred intercompany gain of 2%, and West Virginia tax law change of 2% in 2021.

The valuation allowance referenced above was established in the third quarter 2021 based on a change in DTE Energy's assessment of its ability to utilize certain charitable contribution carryforwards. The valuation allowance resulted in $18 million of deferred tax expense and was reflected in Income Tax Expense (Benefit) in the Consolidated Statements of Operations for the three and nine months ended September 30, 2021. For the deferred tax remeasurement and deferred intercompany gain noted above, refer to the "Separation of DT Midstream - Tax Impacts" section below for additional information.

The 1% decrease in DTE Electric's effective tax rate for the three months ended September 30, 2021 was primarily due to production tax credits. The 2% decrease in DTE Electric's effective tax rate for the nine months ended September 30, 2021 was primarily due to production tax credits of 1% and amortization of the TCJA regulatory liability of 1%.

DTE Electric had income tax receivables with DTE Energy of $11 million and $8 million at September 30, 2021 and December 31, 2020, respectively.

Separation of DT Midstream - Tax Impacts

On July 1, 2021, DTE Energy completed the separation of its natural gas pipeline, storage and gathering non-utility business, DT Midstream. Refer to Note 4 to the Consolidated Financial Statements, "Dispositions and Impairments" for additional information regarding the separation. The separation was a tax free distribution to shareholders, but triggered certain tax effects at DTE Energy including the remeasurement of state deferred tax assets and liabilities and the recognition of a deferred intercompany gain. The state remeasurement reduced deferred tax liabilities and generated a deferred tax benefit of $85 million. The recognition of the deferred intercompany gain resulted in $9 million of additional deferred tax expense. Both of these impacts were reflected in Income Tax Expense (Benefit) in the Consolidated Statements of Operations for the three and nine months ended September 30, 2021.

Unrecognized Compensation Costs

As of September 30, 2021, DTE Energy had $76 million of total unrecognized compensation cost related to non-vested stock incentive plan arrangements. That cost is expected to be recognized over a weighted-average period of 1.4 years.

Allocated Stock-Based Compensation

DTE Electric received an allocation of costs from DTE Energy associated with stock-based compensation of $10 million and $12 million for the three months ended September 30, 2021 and 2020, respectively, while such allocation was $35 million and $28 million for the nine months ended September 30, 2021 and 2020, respectively.

22

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Cash, Cash Equivalents, and Restricted Cash

Cash and cash equivalents include cash on hand, cash in banks, and temporary investments purchased with remaining maturities of three months or less. Restricted cash consists of funds held in separate bank accounts to satisfy contractual obligations and guarantee performance. Restricted cash designated for payments within one year is classified as a Current Asset.

Financing Receivables

Financing receivables are primarily composed of trade receivables, notes receivable, and unbilled revenue. The Registrants' financing receivables are stated at net realizable value.

The Registrants monitor the credit quality of their financing receivables on a regular basis by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, ratings by credit agencies where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, the Registrants have determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have ranked the counterparty as investment grade. To the extent credit ratings are not available, the Registrants utilize other credit quality indicators to determine the level of risk associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have ranked the counterparty as below investment grade; however, due to favorable information on other credit quality indicators, the Registrants have determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status.

The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through September 30, 2021.

	DTE Energy								DTE Electric
	Year of Origination
	2021		2020		2019 and Prior		Total		2021 and Prior
	(In millions)
Notes receivable
Internal grade 1	$	—	$	—	$	19	$	19	$	14
Internal grade 2	2		100		21		123		3
Internal grade 3	—		—		—		—		—
Total notes receivable(a)	$	2	$	100	$	40	$	142	$	17
Net investment in leases
Net investment in leases, internal grade 1	$	—	$	2	$	39	$	41	$	—
Net investment in leases, internal grade 2	—		159		1		160		—
Total net investment in leases(a)	$	—	$	161	$	40	$	201	$	—

_______________________________________

(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other on the Consolidated Statements of Financial Position.

The allowance for doubtful accounts on accounts receivable for the utility entities is generally calculated using an aging approach that utilizes rates developed in reserve studies. DTE Electric and DTE Gas establish an allowance for uncollectible accounts based on historical losses and management's assessment of existing and future economic conditions, customer trends and other factors. Customer accounts are generally considered delinquent if the amount billed is not received by the due date, which is typically in 21 days, however, factors such as assistance programs may delay aggressive action. DTE Electric and DTE Gas generally assess late payment fees on trade receivables based on past-due terms with customers. Customer accounts are written off when collection efforts have been exhausted. The time period for write-off is 150 days after service has been terminated.

23

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The customer allowance for doubtful accounts for non-utility businesses and other receivables for both utility and non-utility businesses is generally calculated based on specific review of probable future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based upon the specific circumstances of the associated receivable.

Notes receivable for DTE Energy are primarily comprised of finance lease receivables and loans that are included in Notes Receivable and Other current assets on DTE Energy's Consolidated Statements of Financial Position. Notes receivable for DTE Electric are primarily comprised of loans.

Notes receivable are typically considered delinquent when payment is not received for periods ranging from 60 to 120 days. The Registrants cease accruing interest (nonaccrual status), consider a note receivable impaired, and establish an allowance for credit loss when it is probable that all principal and interest amounts due will not be collected in accordance with the contractual terms of the note receivable. In determining the allowance for credit losses for notes receivable, the Registrants consider the historical payment experience and other factors that are expected to have a specific impact on the counterparty's ability to pay including existing and future economic conditions.

Cash payments received on nonaccrual status notes receivable, that do not bring the account contractually current, are first applied to the contractually owed past due interest, with any remainder applied to principal. Accrual of interest is generally resumed when the note receivable becomes contractually current.

The following tables present a roll-forward of the activity for the Registrants' financing receivables credit loss reserves:

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2021	$	101	$	3	$	104	$	57
Current period provision	41		1		42		27
Write-offs charged against allowance	(92)		(1)		(93)		(58)
Recoveries of amounts previously written off	49		—		49		29
Ending reserve balance, September 30, 2021	$	99	$	3	$	102	$	55

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2020(a)	$	79	$	4	$	83	$	46
Current period provision	102		3		105		61
Write-offs charged against allowance	(130)		(4)		(134)		(80)
Recoveries of amounts previously written off	50		—		50		30
Ending reserve balance, December 31, 2020	$	101	$	3	$	104	$	57

_______________________________________

(a)DTE Energy Trade accounts receivable beginning reserve balance excludes $8 million related to the discontinued operations of DT Midstream. Prospective activity includes only the continuing operations of DTE Energy.

24

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Uncollectible expense for the Registrants is primarily comprised of the current period provision for allowance for doubtful accounts and is summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
DTE Energy	$	7	$	22	$	42	$	72
DTE Electric	10		16		26		42

There are no material amounts of past due financing receivables for the Registrants as of September 30, 2021.

NOTE 3 — NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Pronouncements

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.

In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity. The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.

Recently Issued Pronouncements

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting, as amended. The amendments in this update provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. The Registrants presently have various contracts that reference LIBOR and are assessing how this standard may be applied to specific contract modifications.

In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments. The amendments in this update modify lease classification requirements for lessors, providing that lease contracts with variable lease payments that do not depend on a reference index or a rate should be classified as operating leases if they would have been classified as a sales-type or direct financing lease and resulted in the recognition of a selling loss at lease commencement. The ASU is effective for the Registrants for fiscal years beginning after December 15, 2021, and interim periods therein. Early adoption is permitted. The Registrants are currently assessing the impact of this standard on their Consolidated Financial Statements.

25

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 4 — DISPOSITIONS AND IMPAIRMENTS

Separation of DT Midstream

On October 27, 2020, DTE Energy announced that its Board of Directors had authorized management to pursue a plan to spin-off its natural gas pipeline, storage and gathering non-utility business. On July 1, 2021, DTE Energy completed the separation of the new company, DT Midstream, through the distribution of 96,732,466 shares of DT Midstream common stock to DTE Energy shareholders. The distribution reflected 100% of the outstanding common stock of DT Midstream as of 5:00 p.m. ET on June 18, 2021 (the “record date”). DTE Energy shareholders received one share of DT Midstream common stock for every two shares of DTE Energy common stock held at the close of business on the record date, with certain shareholders receiving cash in lieu of fractional shares of DT Midstream common stock. For U.S. federal income tax purposes, DTE Energy’s U.S. shareholders generally should not recognize gain or loss as a result of the distribution of DT Midstream stock, except with respect to cash received in lieu of fractional shares.

In June 2021, in order to facilitate the separation and settle intercompany balances with DTE Energy, DT Midstream issued long-term debt in the form of $2.1 billion senior notes and a $1.0 billion term loan. Using the debt proceeds, net of discount and issuance costs of $53 million, DT Midstream made the following cash payments:

•Settled Short-term borrowings due to DTE Energy as of June 30, 2021 of $2,537 million

•Settled affiliate Accounts Receivable due from DTE Energy and affiliate Accounts payable due to DTE Energy as of June 30, 2021 for net cash paid to DTE Energy of $9 million

•Provided a one-time special dividend to DTE Energy of $501 million

These payments eliminated in consolidation and had no direct impact on DTE Energy’s Consolidated Financial Statements of Financial Position. During July and August 2021, DTE Energy used the proceeds received from DT Midstream to optionally redeem $2.6 billion of long-term debt. Refer to Note 10 to the Consolidated Financial Statements, “Long-term Debt,” for additional information.

Continuing Involvement

Following the separation on July 1, 2021, DT Midstream became an independent public company listed under the symbol “DTM” on the New York Stock Exchange (NYSE) and DTE Energy no longer retains any ownership in DT Midstream. In order to govern the ongoing relationships between DT Midstream and DTE Energy after the separation and to facilitate an orderly transition, the parties entered into a series of agreements including the following:

•Separation and Distribution Agreement – sets forth the principal actions to be taken in connection with the separation, including the transfer of assets and assumption of liabilities, among others, and sets forth other agreements governing aspects of the relationship between DTE Energy and DT Midstream

•Transition Services Agreement – allows for DTE Energy to provide DT Midstream with specified services for a limited time and no longer than 24 months following the separation, with related costs to be paid by DT Midstream. Services include support for gas operations, information technology, accounting, tax, legal, human resources, and various other administrative services

•Tax Matters Agreement – governs the respective rights, responsibilities and obligations of DTE Energy and DT Midstream after the separation with respect to all tax matters

•Employee Matters Agreement – addresses certain employment, compensation and benefits matters, including the allocation and treatment of certain assets and liabilities relating to DT Midstream employees

In addition, DTE Energy and its subsidiaries have various commercial agreements that will continue after the separation. These agreements include certain pipeline, gathering, and storage services and operating and maintenance agreements, and are not considered material to the Consolidated Financial Statements.

26

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Discontinued Operations

The table below reflects the financial results of DT Midstream that have been reclassified from continuing operations and included in discontinued operations within the Consolidated Statements of Operations. These results include the impact of tax-related adjustments and all transaction costs related to the separation. General corporate overhead costs have been excluded and no portion of corporate interest costs were allocated to discontinued operations.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Non-utility operations	$	—	$	204	$	405	$	546
Operating Expenses
Cost of gas and other — non-utility	—		6		15		14
Operation and maintenance(a)	30		32		124		80
Depreciation and amortization	—		38		82		110
Taxes other than income	—		3		13		12
Asset (gains) losses and impairments, net	—		(4)		17		(4)
	30		75		251		212
Operating Income (Loss)	(30)		129		154		334
Other (Income) and Deductions
Interest expense	—		29		50		82
Interest income	—		(4)		(4)		(6)
Other income	—		(45)		(62)		(98)
	—		(20)		(16)		(22)
Income (Loss) from Discontinued Operations Before Income Taxes	(30)		149		170		356
Income Tax Expense	3		42		58		99
Income (Loss) from Discontinued Operations, Net of Taxes	(33)		107		112		257
Less: Net Income Attributable to Noncontrolling Interests	—		3		6		8
Net Income (Loss) from Discontinued Operations	$	(33)	$	104	$	106	$	249

_______________________________________

(a)Includes separation transaction costs of $30 million and $59 million for the three and nine months ended September 30, 2021, respectively, for various legal, accounting and other professional services fees. There were no costs incurred in the comparable prior year periods. Total transaction costs of $67 million have been incurred since October 2020.

27

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The table below reflects the major assets and liabilities that were transferred to DT Midstream and presented as discontinued operations in the Consolidated Statements of Financial Position as of December 31, 2020.

	December 31, 2020
	(In millions)
Total Assets of Discontinued Operations
Cash	$	42
Accounts receivable	126
Inventories	8
Other	44
Current assets of DT Midstream	220
Less: Previously affiliated amounts eliminated at DTE Energy	3
Current assets of discontinued operations for DTE Energy	217
Investments in equity method investees	1,691
Net property, plant, and equipment	3,470
Goodwill	473
Intangible assets	2,140
Notes receivable	19
Operating lease right-of-use assets	45
Other	21
Noncurrent assets of discontinued operations for DTE Energy	7,859
Total Assets of Discontinued Operations for DTE Energy	$	8,076
Total Liabilities of Discontinued Operations
Accounts payable	$	39
Operating lease liabilities	17
Short-term borrowings due to DTE Energy(a)	2,913
Other	53
Current liabilities of DT Midstream	3,022
Less: Previously affiliated amounts eliminated at DTE Energy	2,923
Current liabilities of discontinued operations for DTE Energy	99
Deferred income taxes	753
Asset retirement obligations	10
Operating lease liabilities	28
Other	45
Noncurrent liabilities of discontinued operations for DTE Energy	836
Total Liabilities of Discontinued Operations for DTE Energy	$	935

______________________________________

(a)Short-term borrowings due to DTE Energy resulted in an intercompany note receivable in the Corporate and Other segment at December 31, 2020. The settlement of these borrowings in June 2021 and use of proceeds to redeem DTE Energy long-term debt in the third quarter 2021 has reduced the Total Assets of the Corporate and Other segment in the current period. Other changes in DTE Energy's Total Assets due to the separation of DT Midstream primarily relate to the elimination of Gas Storage and Pipelines segment assets in 2021.

There were no assets or liabilities from discontinued operations as of September 30, 2021. DT Midstream had net assets of $4.0 billion that separated on July 1, 2021 that resulted in a reduction to DTE Energy's equity during the third quarter. Refer to the Separation of DT Midstream line within DTE Energy's Consolidated Statements of Changes in Equity for further details.

28

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The following table is a summary of significant non-cash items, capital expenditures, and significant financing activities of discontinued operations included in DTE Energy's Consolidated Statements of Cash Flows:

	Nine Months Ended September 30,
	2021		2020
	(In millions)
Operating Activities
Depreciation and amortization	$	82	$	110
Deferred income taxes	57		95
Equity earnings of equity method investees	(59)		(75)
Asset (gains) losses and impairments, net	19		(4)
Investing Activities
Plant and equipment expenditures — non-utility	$	(60)	$	(440)
Financing Activities
Acquisition related deferred payment, excluding accretion	$	—	$	(380)

DTE Vantage Segment Impairment

DTE Vantage owns a pulverized coal facility located at DTE Electric’s River Rouge power plant. The facility provides pulverized coal to a steel industry customer through a supply agreement expiring in 2028. The River Rouge plant provides operation and maintenance services to the facility through an agreement which also expires in 2028.

During the second quarter 2021, DTE Electric retired the River Rouge plant and provided an early termination notice of the operation and maintenance services agreement with the pulverized coal facility. The termination would be effective December 31, 2021, at which point DTE Vantage expects to cease operations at the facility.

In connection with these events, DTE Energy performed an impairment analysis of the pulverized coal facility long-lived assets in accordance with ASC 360, Property, Plant and Equipment. Based on its undiscounted cash flow projections, DTE Energy determined that the carrying value of the pulverized coal facility asset group is not recoverable. As a result, DTE Energy recorded a non-cash impairment charge of $27 million, which is included in Asset (gains) losses and impairments, net on DTE Energy’s Consolidated Statements of Operations for the nine months ended September 30, 2021. The charge included $18 million to fully impair the long-lived assets recorded to Property, plant and equipment and a $9 million write-down of Other noncurrent assets to fair value. Fair value of the assets was determined using an income approach, which utilized assumptions including management’s best estimates of the expected future cash flows, the estimated useful life of the asset group and discount rate.

There were no other adjustments deemed necessary as of September 30, 2021 related to the closure of the facility. DTE Energy is currently monitoring contract negotiations with the steel industry customer to determine any future impacts. An estimate of such impacts cannot be determined at this time as alternatives are currently being evaluated; however, the likelihood of any impact being material to DTE Energy’s Consolidated Financial Statements is remote.

29

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 5 — REVENUE

Disaggregation of Revenue

The following is a summary of revenues disaggregated by segment for DTE Energy:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric(a)
Residential	$	885	$	900	$	2,262	$	2,169
Commercial	533		498		1,452		1,313
Industrial	167		157		473		434
Other(b)	117		138		290		305
Total Electric operating revenues	$	1,702	$	1,693	$	4,477	$	4,221
Gas
Gas sales	$	95	$	92	$	726	$	655
End User Transportation	38		34		171		154
Intermediate Transportation	16		15		59		57
Other(b)	44		32		114		98
Total Gas operating revenues	$	193	$	173	$	1,070	$	964
Other segment operating revenues
DTE Vantage	$	372	$	324	$	1,132	$	850
Energy Trading	$	1,602	$	1,061	$	4,208	$	2,714

_______________________________________

(a)Revenues generally represent those of DTE Electric, except $2 million and $3 million of Other revenues related to DTE Sustainable Generation for the three months ended September 30, 2021 and 2020, respectively, and $9 million and $10 million for the nine months ended September 30, 2021 and 2020, respectively.

(b)Includes revenue adjustments related to various regulatory mechanisms.

Revenues included the following which were outside the scope of Topic 606:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric — Other revenues	$	6	$	8	$	14	$	18
Gas — Alternative Revenue Programs	—		—		—		2
Gas — Other revenues	1		2		5		7
DTE Vantage — Leases	26		26		70		74
Energy Trading — Derivatives	1,324		731		3,377		1,835

Deferred Revenue

The following is a summary of deferred revenue activity:

	DTE Energy
	(In millions)
Beginning Balance, January 1, 2021(a)	$	65
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	79
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(19)
Ending Balance, September 30, 2021	$	125

_______________________________________

(a)Excludes $22 million of deferred revenue related to the discontinued operations of DT Midstream. Prospective activity includes only the continuing operations of DTE Energy.

30

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The deferred revenues at DTE Energy generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied.

Deferred revenues include amounts associated with REC performance obligations under certain wholesale full requirements power contracts. Deferred revenues associated with RECs are recognized as revenue when control of the RECs has transferred.

Other performance obligations associated with deferred revenues include providing products and services related to customer prepayments. Deferred revenues associated with these products and services are recognized when control has transferred to the customer.

The following table represents deferred revenue amounts for DTE Energy that are expected to be recognized as revenue in future periods:

	DTE Energy
	(In millions)
2021	$	72
2022	50
2023	1
2024	1
2025	—
2026 and thereafter	1
	$	125

Transaction Price Allocated to the Remaining Performance Obligations

In accordance with optional exemptions available under Topic 606, the Registrants did not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which revenue is recognized at the amount to which the Registrants have the right to invoice for goods provided and services performed, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.

Such contracts consist of varying types of performance obligations across the segments, including the supply and delivery of energy related products and services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related consideration under the contract is variable at inception of the contract. Contract lengths vary from cancellable to multi-year.

The Registrants expect to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:

	DTE Energy		DTE Electric
	(In millions)
2021	$	41	$	2
2022	308		8
2023	264		7
2024	159		7
2025	80		1
2026 and thereafter	421		—
	$	1,273	$	25

31

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 6 — REGULATORY MATTERS

2020-2021 Accounting Applications

On July 9, 2020, the MPSC approved DTE Electric's request to accelerate amortization of the portion of its refundable federal income taxes regulatory liability related to non-plant accumulated deferred income tax balances that resulted from the TCJA. DTE Electric was authorized to increase amortization by $102 million beginning in May 2021, which would fully amortize this portion of the liability by the end of 2021 instead of April 2033. The accelerated amortization would not impact customer rates and would allow DTE Electric to defer its next rate case filing previously set for July 2020 to March 2021.

On February 26, 2021, DTE Electric filed an additional application requesting a delay in the accelerated amortization approved in the 2020 application. DTE Electric requested delaying the start of amortization from May 2021 to December 1, 2021, which would fully amortize these balances by the end of 2022 and allow DTE Electric to further defer its next rate case filing. The accounting application was approved by the MPSC on April 8, 2021.

On August 31, 2021, DTE Electric filed an accounting application with the MPSC requesting approval of a one-time voluntary refund of $70 million collected in 2021 associated with the unexpected customer usage patterns due to the COVID-19 pandemic. This refund would be administered by investing in additional tree trimming without seeking future cost recovery. Such efforts would serve to improve customer reliability without impacting rates, thus providing an affordability benefit to customers. These investments would be incremental to the Tree Trim Surge expenses previously authorized by the MPSC.

DTE Electric anticipates receiving an order by the end of 2021. If approved by the end of the year, a regulatory liability will be recognized at that time. The regulatory liability would be reduced as the additional tree trim expenses are incurred during the remainder of 2021 through 2023. If the full $70 million is not spent by the end of 2023, DTE Electric would provide refunds to customers via bill credits for any shortage.

2021 Securitization Filing

On March 26, 2021, DTE Electric filed an application requesting a financing order approving the securitization of $184 million of qualified costs related to the net book value of the River Rouge generation plant and tree trimming surge program costs. The filing requested collection of these qualifying costs from DTE Electric's customers.

A final MPSC order was issued on June 23, 2021 authorizing DTE Electric to proceed with the issuance of securitization bonds for qualified costs of up to $236 million, increased for the inclusion of deferred income taxes. The order authorized customer charges for the timely recovery of the amount securitized and other ongoing qualified costs. Securitization is expected in the first quarter 2022.

2021 Gas Rate Case Filing

DTE Gas filed a rate case with the MPSC on February 12, 2021 requesting an increase in base rates of $195 million based on a projected twelve-month period ending December 31, 2022. The requested increase in base rates is primarily due to an increase in net plant resulting from infrastructure investments and operating and maintenance expenses. The rate filing also requested an increase in return on equity from 9.9% to 10.25% and includes projected changes in sales and working capital. A final MPSC order in this case is expected by December 2021.

32

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 7 — COMMON STOCK AND EARNINGS PER SHARE

Earnings per Share

Basic earnings per share is calculated by dividing net income, adjusted for income allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution that would occur if any potentially dilutive instruments were exercised or converted into common shares. DTE Energy’s participating securities are restricted shares under the stock incentive program that contain rights to receive non-forfeitable dividends. Equity units and performance shares do not receive cash dividends; as such, these awards are not considered participating securities.

The following is a reconciliation of DTE Energy's basic and diluted income per share calculation:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions, except per share amounts)
Basic Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Less: Allocation of earnings to net restricted stock awards	—		1		1		2
	$	58	$	371	$	494	$	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)		104		106		249
Net income available to common shareholders — basic	$	25	$	475	$	600	$	1,091
Average number of common shares outstanding — basic	193		193		193		192
Income from continuing operations	$	0.30	$	1.93	$	2.55	$	4.37
Income (loss) from discontinued operations	(0.17)		0.54		0.55		1.30
Basic Earnings per Common Share	$	0.13	$	2.47	$	3.10	$	5.67
Diluted Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Less: Allocation of earnings to net restricted stock awards	—		1		1		2
	$	58	$	371	$	494	$	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)		104		106		249
Net income available to common shareholders — diluted	$	25	$	475	$	600	$	1,091
Average number of common shares outstanding — basic	193		193		193		192
Average dilutive equity units, performance share awards, and stock options	1		—		1		1
Average number of common shares outstanding — diluted	194		193		194		193
Income from continuing operations	$	0.30	$	1.92	$	2.55	$	4.37
Income (loss) from discontinued operations	(0.17)		0.54		0.55		1.29
Diluted Earnings per Common Share(a)	$	0.13	$	2.46	$	3.10	$	5.66

_______________________________________

(a)Equity Units excluded from the calculation of diluted EPS were approximately 11.1 million and 10.3 million for the three months ended September 30, 2021 and 2020, respectively, and 11.5 million and 10.3 million for the nine months ended September 30, 2021 and 2020, respectively, as the dilutive stock price threshold was not met.

33

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Stock Purchase Contract Adjustments

In December 2019, DTE Energy closed on the purchase of midstream natural gas assets. The acquisition was financed through the issuance of Senior Notes, common stock, and $1.3 billion of Equity Units. Each Equity Unit has a stated amount of $50 and was initially issued in the form of a Corporate Unit, comprised of (i) a forward purchase contract to buy DTE Energy common stock (stock purchase contract) and (ii) a 1/20 undivided beneficial ownership interest in a $1,000 principal amount of DTE Energy’s 2019 Series F 2.25% RSNs due 2025.

The stock purchase contract obligates the holder to purchase from DTE Energy on the settlement date, November 1, 2022, for a price of $50 per stock purchase contract, a certain number of shares of DTE Energy’s common stock. As a result of the spin-off of DT Midstream in July 2021, there was a change in the settlement rates in the stock purchase contract to reflect the dividend of DT Midstream stock to DTE Energy shareholders. As adjusted for this change, anti-dilution adjustments to date, and subject to future anti-dilution adjustments, the following number of shares must be purchased:

•if the AMV of DTE Energy’s common stock, which is the average volume-weighted average price of DTE Energy’s common stock for the trading days during the 20 consecutive scheduled trading day period ending on the third scheduled trading day immediately preceding the stock purchase contract settlement date, is equal to or greater than $133.08, 0.3757 shares of common stock;

•if the AMV is less than $133.08 but greater than $106.50, a number of shares of common stock equal to $50 divided by the AMV; and

•if the AMV is less than or equal to $106.50, 0.4695 shares of common stock.

The present value of future contract adjustment payments of $150 million was initially recorded as a reduction of shareholders’ equity, offset by the stock purchase contract liability. The stock purchase contract liability was not impacted by the change in settlement rates and a liability of $64 million remains included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy’s Consolidated Statements of Financial Position as of September 30, 2021. DTE Energy will continue issuing quarterly payments through the settlement date of November 1, 2022.

The treasury stock method is used to compute diluted EPS for the stock purchase contract. Under the treasury stock method, the stock purchase contract will only have a dilutive effect when the settlement rate is based on the market value of DTE’s common stock that is greater than $133.08 (the threshold appreciation price). At September 30, 2021, the stock purchase price contract was anti-dilutive and, therefore, not included in the computation of diluted earnings per share.

Until settlement of the stock purchase contracts, the shares of stock underlying each contract are not outstanding. Under the terms of the stock purchase contracts, assuming no anti-dilution or other adjustments, DTE Energy will issue between 9.8 million and 12.2 million shares of its common stock in November 2022. A total of 13 million shares of DTE Energy’s common stock have been reserved for issuance in connection with the stock purchase contracts.

For additional information regarding the equity units, refer to Note 15, "Long-term Debt" in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.

34

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 8 — FAIR VALUE

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. The Registrants make certain assumptions they believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Registrants and their counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at September 30, 2021 and December 31, 2020. The Registrants believe they use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Registrants classify fair value balances based on the fair value hierarchy defined as follows:

•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Registrants have the ability to access as of the reporting date.

•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

35

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The following table presents assets and liabilities for DTE Energy measured and recorded at fair value on a recurring basis:

	September 30, 2021												December 31, 2020
	Level 1		Level 2		Level 3		Other(a)		Netting(b)		Net Balance		Level 1		Level 2		Level 3		Other(a)		Netting(b)		Net Balance
	(In millions)
Assets
Cash equivalents(c)	$	9	$	—	$	—	$	—	$	—	$	9	$	438	$	—	$	—	$	—	$	—	$	438
Nuclear decommissioning trusts
Equity securities	944		—		—		196		—		1,140		947		—		—		222		—		1,169
Fixed income securities	127		429		—		102		—		658		102		371		—		82		—		555
Private equity and other	—		—		—		175		—		175		—		—		—		104		—		104
Cash equivalents	34		—		—		—		—		34		27		—		—		—		—		27
Other investments(d)
Equity securities	61		—		—		—		—		61		55		—		—		—		—		55
Fixed income securities	7		—		—		—		—		7		8		—		—		—		—		8
Cash equivalents	86		—		—		—		—		86		97		—		—		—		—		97
Derivative assets
Commodity contracts(e)
Natural gas	579		146		53		—		(715)		63		99		74		60		—		(156)		77
Electricity	—		707		245		—		(627)		325		—		128		52		—		(120)		60
Environmental & Other	—		598		12		—		(570)		40		—		150		4		—		(135)		19
Total derivative assets	579		1,451		310		—		(1,912)		428		99		352		116		—		(411)		156
Total	$	1,847	$	1,880	$	310	$	473	$	(1,912)	$	2,598	$	1,773	$	723	$	116	$	408	$	(411)	$	2,609
Liabilities
Derivative liabilities
Commodity contracts(e)
Natural gas	$	(425)	$	(297)	$	(333)	$	—	$	664	$	(391)	$	(88)	$	(59)	$	(76)	$	—	$	151	$	(72)
Electricity	—		(576)		(340)		—		614		(302)		—		(126)		(42)		—		125		(43)
Environmental & Other	—		(581)		—		—		570		(11)		—		(137)		—		—		129		(8)
Foreign currency exchange contracts	—		(5)		—		—		—		(5)		—		(5)				—		—		(5)
Total	$	(425)	$	(1,459)	$	(673)	$	—	$	1,848	$	(709)	$	(88)	$	(327)	$	(118)	$	—	$	405	$	(128)
Net Assets (Liabilities) at end of period	$	1,422	$	421	$	(363)	$	473	$	(64)	$	1,889	$	1,685	$	396	$	(2)	$	408	$	(6)	$	2,481
Assets
Current	$	506	$	1,183	$	258	$	—	$	(1,591)	$	356	$	532	$	260	$	92	$	—	$	(330)	$	554
Noncurrent	1,341		697		52		473		(321)		2,242		1,241		463		24		408		(81)		2,055
Total Assets	$	1,847	$	1,880	$	310	$	473	$	(1,912)	$	2,598	$	1,773	$	723	$	116	$	408	$	(411)	$	2,609
Liabilities
Current	$	(409)	$	(1,138)	$	(464)	$	—	$	1,546	$	(465)	$	(84)	$	(223)	$	(79)	$	—	$	318	$	(68)
Noncurrent	(16)		(321)		(209)		—		302		(244)		(4)		(104)		(39)		—		87		(60)
Total Liabilities	$	(425)	$	(1,459)	$	(673)	$	—	$	1,848	$	(709)	$	(88)	$	(327)	$	(118)	$	—	$	405	$	(128)
Net Assets (Liabilities) at end of period	$	1,422	$	421	$	(363)	$	473	$	(64)	$	1,889	$	1,685	$	396	$	(2)	$	408	$	(6)	$	2,481

_______________________________________

(a)Amounts represent assets valued at NAV as a practical expedient for fair value.

(b)Amounts represent the impact of master netting agreements that allow DTE Energy to net gain and loss positions and cash collateral held or placed with the same counterparties.

(c)Amounts consisted of $1 million and $2 million of cash equivalents included in Restricted cash on DTE Energy's Consolidated Statements of Financial Position at September 30, 2021 and December 31, 2020, respectively. All other amounts are included in Cash and cash equivalents on the Consolidated Statements of Financial Position.

(d)Excludes cash surrender value of life insurance investments.

(e)For contracts with a clearing agent, DTE Energy nets all activity across commodities. This can result in some individual commodities having a contra balance.

36

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The following table presents assets for DTE Electric measured and recorded at fair value on a recurring basis as of:

	September 30, 2021										December 31, 2020
	Level 1		Level 2		Level 3		Other(a)		Net Balance		Level 1		Level 2		Level 3		Other(a)		Net Balance
	(In millions)
Assets
Cash equivalents	$	—	$	—	$	—	$	—	$	—	$	4	$	—	$	—	$	—	$	4
Nuclear decommissioning trusts
Equity securities	944		—		—		196		1,140		947		—		—		222		1,169
Fixed income securities	127		429		—		102		658		102		371		—		82		555
Private equity and other	—		—		—		175		175		—		—		—		104		104
Cash equivalents	34		—		—		—		34		27		—		—		—		27
Other investments
Equity securities	18		—		—		—		18		16		—		—		—		16
Cash equivalents	11		—		—		—		11		11		—		—		—		11
Derivative assets — FTRs	—		—		12		—		12		—		—		4		—		4
Total	$	1,134	$	429	$	12	$	473	$	2,048	$	1,107	$	371	$	4	$	408	$	1,890
Assets
Current	$	—	$	—	$	12	$	—	$	12	$	4	$	—	$	4	$	—	$	8
Noncurrent	1,134		429		—		473		2,036		1,103		371		—		408		1,882
Total Assets	$	1,134	$	429	$	12	$	473	$	2,048	$	1,107	$	371	$	4	$	408	$	1,890

_______________________________________

(a)Amounts represent assets valued at NAV as a practical expedient for fair value.

Cash Equivalents

Cash equivalents include investments with maturities of three months or less when purchased. The cash equivalents shown in the fair value table are comprised of short-term investments and money market funds.

Nuclear Decommissioning Trusts and Other Investments

The nuclear decommissioning trusts and other investments hold debt and equity securities directly and indirectly through commingled funds. Exchange-traded debt and equity securities held directly, as well as publicly-traded commingled funds, are valued using quoted market prices in actively traded markets. Non-exchange traded fixed income securities are valued based upon quotations available from brokers or pricing services.

Non-publicly traded commingled funds holding exchange-traded equity or debt securities are valued based on stated NAVs. There are no significant restrictions for these funds and investments may be redeemed with 7 to 65 days notice depending on the fund. There is no intention to sell the investment in these commingled funds.

Private equity and other assets include a diversified group of funds that are classified as NAV assets. These funds primarily invest in limited partnerships, including private equity, private real estate and private credit. Distributions are received through the liquidation of the underlying fund assets over the life of the funds. There are generally no redemption rights. The limited partner must hold the fund for its life or find a third-party buyer, which may need to be approved by the general partner. The funds are established with varied contractual durations generally in the range of 7 years to 12 years. The fund life can often be extended by several years by the general partner, and further extended with the approval of the limited partners. Unfunded commitments related to these investments totaled $155 million and $183 million as of September 30, 2021 and December 31, 2020, respectively.

For pricing the nuclear decommissioning trusts and other investments, a primary price source is identified by asset type, class, or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary source of a given security if the trustee determines that another price source is considered preferable. The Registrants have obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices.

37

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Derivative Assets and Liabilities

Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options, and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. The Registrants consider the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time, and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality, and basis differential factors. The Registrants monitor the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. The Registrants have obtained an understanding of how these prices are derived. Additionally, the Registrants selectively corroborate the fair value of their transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period. The Registrants have established a Risk Management Committee whose responsibilities include directly or indirectly ensuring all valuation methods are applied in accordance with predefined policies. The development and maintenance of the Registrants' forward price curves has been assigned to DTE Energy's Risk Management Department, which is separate and distinct from the trading functions within DTE Energy.

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Energy:

	Three Months Ended September 30, 2021								Three Months Ended September 30, 2020
	Natural Gas		Electricity		Other		Total		Natural Gas		Electricity		Other		Total
	(In millions)
Net Assets (Liabilities) as of June 30	$	(181)	$	(49)	$	15	$	(215)	$	20	$	16	$	10	$	46
Transfers from Level 3 into Level 2	—		—		—		—		(1)		—		—		(1)
Total gains (losses)
Included in earnings(a)	(162)		(21)		—		(183)		(80)		37		1		(42)
Recorded in Regulatory liabilities	—		—		(1)		(1)		—		—		9		9
Purchases, issuances, and settlements
Settlements	63		(25)		(2)		36		22		(48)		(13)		(39)
Net Assets (Liabilities) as of September 30	$	(280)	$	(95)	$	12	$	(363)	$	(39)	$	5	$	7	$	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30(a)	$	(109)	$	(30)	$	(2)	$	(141)	$	(57)	$	11	$	(1)	$	(47)

_______________________________________

(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.

38

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

	Nine Months Ended September 30, 2021								Nine Months Ended September 30, 2020
	Natural Gas		Electricity		Other		Total		Natural Gas		Electricity		Other		Total
	(In millions)
Net Assets (Liabilities) as of December 31	$	(16)	$	10	$	4	$	(2)	$	(15)	$	16	$	3	$	4
Transfers from Level 3 into Level 2	—		—		—		—		(5)		—		—		(5)
Total gains (losses)
Included in earnings(a)	(356)		(5)		—		(361)		(44)		90		(7)		39
Recorded in Regulatory liabilities	—		—		14		14		—		—		21		21
Purchases, issuances, and settlements
Settlements	92		(100)		(6)		(14)		25		(101)		(10)		(86)
Net Assets (Liabilities) as of September 30	$	(280)	$	(95)	$	12	$	(363)	$	(39)	$	5	$	7	$	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30(a)	$	(301)	$	(54)	$	(17)	$	(372)	$	(20)	$	53	$	(17)	$	16
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30	$	—	$	—	$	12	$	12	$	—	$	—	$	7	$	7

_______________________________________

(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Assets as of beginning of period	$	15	$	10	$	4	$	3
Change in fair value recorded in Regulatory liabilities	(1)		9		14		21
Purchases, issuances, and settlements
Settlements	(2)		(12)		(6)		(17)
Net Assets as of September 30	$	12	$	7	$	12	$	7
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30	$	—	$	—	$	12	$	7

Derivatives are transferred between levels primarily due to changes in the source data used to construct price curves as a result of changes in market liquidity. Transfers in and transfers out are reflected as if they had occurred at the beginning of the period. There were no transfers from or into Level 3 for DTE Electric during the three and nine months ended September 30, 2021 and 2020.

The following tables present the unobservable inputs related to DTE Energy's Level 3 assets and liabilities:

	September 30, 2021
Commodity Contracts	Derivative Assets		Derivative Liabilities		Valuation Techniques	Unobservable Input	Range						Weighted Average
	(In millions)
Natural Gas	$	53	$	(333)	Discounted Cash Flow	Forward basis price (per MMBtu)	$	(1.33)	—	$	3.53	/MMBtu	$	(0.04)	/MMBtu
Electricity	$	245	$	(340)	Discounted Cash Flow	Forward basis price (per MWh)	$	(8)	—	$	10	/MWh	$	(1)	/MWh

39

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

	December 31, 2020
Commodity Contracts	Derivative Assets		Derivative Liabilities		Valuation Techniques	Unobservable Input	Range						Weighted Average
	(In millions)
Natural Gas	$	60	$	(76)	Discounted Cash Flow	Forward basis price (per MMBtu)	$	(0.86)	—	$	2.50	/MMBtu	$	(0.07)	/MMBtu
Electricity	$	52	$	(42)	Discounted Cash Flow	Forward basis price (per MWh)	$	(9)	—	$	6	/MWh	$	—	/MWh

The unobservable inputs used in the fair value measurement of the electricity and natural gas commodity types consist of inputs that are less observable due in part to lack of available broker quotes, supported by little, if any, market activity at the measurement date or are based on internally developed models. Certain basis prices (i.e., the difference in pricing between two locations) included in the valuation of natural gas and electricity contracts were deemed unobservable. The weighted average price for unobservable inputs was calculated using the average of forward price curves for natural gas and electricity and the absolute value of monthly volumes.

The inputs listed above would have had a direct impact on the fair values of the above security types if they were adjusted. A significant increase (decrease) in the basis price would have resulted in a higher (lower) fair value for long positions, with offsetting impacts to short positions.

Fair Value of Financial Instruments

The following table presents the carrying amount and fair value of financial instruments for DTE Energy:

	September 30, 2021								December 31, 2020
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(In millions)
Notes receivable(a), excluding lessor finance leases	$	142	$	—	$	—	$	142	$	141	$	—	$	—	$	141
Short-term borrowings	$	361	$	—	$	361	$	—	$	38	$	—	$	38	$	—
Notes payable(b)	$	5	$	—	$	—	$	5	$	19	$	—	$	—	$	19
Long-term debt(c)	$	17,222	$	2,241	$	15,486	$	1,104	$	19,439	$	2,547	$	18,230	$	1,397

_______________________________________

(a)Current portion included in Current Assets — Other on DTE Energy's Consolidated Statements of Financial Position.

(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy's Consolidated Statements of Financial Position.

(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.

The following table presents the carrying amount and fair value of financial instruments for DTE Electric:

	September 30, 2021								December 31, 2020
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(In millions)
Notes receivable(a)	$	17	$	—	$	—	$	17	$	16	$	—	$	—	$	16
Short-term borrowings — affiliates	$	32	$	—	$	—	$	32	$	101	$	—	$	—	$	101
Short-term borrowings — other	$	159	$	—	$	159	$	—	$	—	$	—	$	—	$	—
Notes payable(b)	$	4	$	—	$	—	$	4	$	17	$	—	$	—	$	17
Long-term debt(c)	$	8,906	$	—	$	9,952	$	150	$	8,236	$	—	$	9,579	$	379

_______________________________________

(a)Included in Current Assets — Other on DTE Electric's Consolidated Statements of Financial Position.

(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Electric's Consolidated Statements of Financial Position.

(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.

For further fair value information on financial and derivative instruments, see Note 9 to the Consolidated Financial Statements, "Financial and Other Derivative Instruments."

40

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Nuclear Decommissioning Trust Funds

DTE Electric has a legal obligation to decommission its nuclear power plants following the expiration of its operating licenses. This obligation is reflected as an Asset retirement obligation on DTE Electric's Consolidated Statements of Financial Position. Rates approved by the MPSC provide for the recovery of decommissioning costs of Fermi 2 and the disposal of low-level radioactive waste.

The following table summarizes DTE Electric's fair value of the nuclear decommissioning trust fund assets:

	September 30, 2021		December 31, 2020
	(In millions)
Fermi 2	$	1,989	$	1,841
Fermi 1	3		3
Low-level radioactive waste	15		11
	$	2,007	$	1,855

The costs of securities sold are determined on the basis of specific identification. The following table sets forth DTE Electric's gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Realized gains	$	21	$	38	$	80	$	172
Realized losses	$	(1)	$	(11)	$	(9)	$	(103)
Proceeds from sale of securities	$	217	$	816	$	854	$	2,054

Realized gains and losses from the sale of securities and unrealized gains and losses incurred by the Fermi 2 trust are recorded to Regulatory assets and the Nuclear decommissioning liability. Realized gains and losses from the sale of securities and unrealized gains and losses on the low-level radioactive waste funds are recorded to the Nuclear decommissioning liability.

The following table sets forth DTE Electric's fair value and unrealized gains and losses for the nuclear decommissioning trust funds:

	September 30, 2021						December 31, 2020
	Fair Value		Unrealized Gains		Unrealized Losses		Fair Value		Unrealized Gains		Unrealized Losses
	(In millions)
Equity securities	$	1,140	$	507	$	(8)	$	1,169	$	481	$	(6)
Fixed income securities	658		24		(5)		555		20		(1)
Private equity and other	175		41		(2)		104		—		—
Cash equivalents	34		—		—		27		—		—
	$	2,007	$	572	$	(15)	$	1,855	$	501	$	(7)

The following table summarizes the fair value of the fixed income securities held in nuclear decommissioning trust funds by contractual maturity:

	September 30, 2021
	(In millions)
Due within one year	$	11
Due after one through five years	138
Due after five through ten years	112
Due after ten years	295
	$	556

41

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Fixed income securities held in nuclear decommissioning trust funds include $102 million of non-publicly traded commingled funds that do not have a contractual maturity date.

Other Securities

At September 30, 2021 and December 31, 2020, the Registrants' securities included in Other investments on the Consolidated Statements of Financial Position were comprised primarily of investments within DTE Energy's rabbi trust. The rabbi trust was established to fund certain non-qualified pension benefits, and therefore changes in market value are recognized in earnings. Gains and losses are allocated from DTE Energy to DTE Electric and are included in Other Income or Other Expense, respectively, in the Registrants' Consolidated Statements of Operations. The following table summarizes the Registrant's gains (losses) related to the trust:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Gains (losses) related to equity securities	$	(1)	$	2	$	3	$	(4)
Gains (losses) related to fixed income securities	—		—		—		(3)
	$	(1)	$	2	$	3	$	(7)

NOTE 9 — FINANCIAL AND OTHER DERIVATIVE INSTRUMENTS

The Registrants recognize all derivatives at their fair value as Derivative assets or liabilities on their respective Consolidated Statements of Financial Position unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the derivative gain or loss is deferred in Accumulated other comprehensive income (loss) and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative and hedged item are recognized in earnings each period. For derivatives that do not qualify or are not designated for hedge accounting, changes in fair value are recognized in earnings each period.

The Registrants' primary market risk exposure is associated with commodity prices, credit, and interest rates. The Registrants have risk management policies to monitor and manage market risks. The Registrants use derivative instruments to manage some of the exposure. DTE Energy uses derivative instruments for trading purposes in its Energy Trading segment. Contracts classified as derivative instruments include electricity, natural gas, oil, certain environmental contracts, forwards, futures, options, swaps, and foreign currency exchange contracts. Items not classified as derivatives include natural gas and environmental inventory, pipeline transportation contracts, certain environmental contracts, and natural gas storage assets.

DTE Electric — DTE Electric generates, purchases, distributes, and sells electricity. DTE Electric uses forward contracts to manage changes in the price of electricity and fuel. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Other derivative contracts are MTM and recoverable through the PSCR mechanism when settled. This results in the deferral of unrealized gains and losses as Regulatory assets or liabilities until realized.

DTE Gas — DTE Gas purchases, stores, transports, distributes, and sells natural gas, and buys and sells transportation and storage capacity. DTE Gas has fixed-priced contracts for portions of its expected natural gas supply requirements through March 2024. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Forward transportation and storage contracts are generally not derivatives and are therefore accounted for under the accrual method.

DTE Vantage — This segment manages and operates industrial energy projects, reduced emissions fuel projects, renewable gas recovery, and power generation assets. Primarily fixed-price contracts are used in the marketing and management of the segment assets. These contracts are generally not derivatives and are therefore accounted for under the accrual method.

42

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Energy Trading — Commodity Price Risk — Energy Trading markets and trades electricity, natural gas physical products, and energy financial instruments, and provides energy and asset management services utilizing energy commodity derivative instruments. Forwards, futures, options, and swap agreements are used to manage exposure to the risk of market price and volume fluctuations in its operations. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.

Energy Trading — Foreign Currency Exchange Risk — Energy Trading has foreign currency exchange forward contracts to economically hedge fixed Canadian dollar commitments existing under natural gas and power purchase and sale contracts and natural gas transportation contracts. Energy Trading enters into these contracts to mitigate price volatility with respect to fluctuations of the Canadian dollar relative to the U.S. dollar. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.

Corporate and Other — Interest Rate Risk — DTE Energy may use interest rate swaps, treasury locks, and other derivatives to hedge the risk associated with interest rate market volatility.

Credit Risk — DTE Energy maintains credit policies that significantly minimize overall credit risk. These policies include an evaluation of potential customers’ and counterparties’ financial condition, including the viability of underlying productive assets, credit rating, collateral requirements, or other credit enhancements such as letters of credit or guarantees. DTE Energy generally uses standardized agreements that allow the netting of positive and negative transactions associated with a single counterparty. DTE Energy maintains a provision for credit losses based on factors surrounding the credit risk of its customers, historical trends, and other information. Based on DTE Energy's credit policies and its September 30, 2021 provision for credit losses, DTE Energy’s exposure to counterparty nonperformance is not expected to have a material adverse effect on DTE Energy's Consolidated Financial Statements.

Derivative Activities

DTE Energy manages its MTM risk on a portfolio basis based upon the delivery period of its contracts and the individual components of the risks within each contract. Accordingly, it records and manages the energy purchase and sale obligations under its contracts in separate components based on the commodity (e.g. electricity or natural gas), the product (e.g. electricity for delivery during peak or off-peak hours), the delivery location (e.g. by region), the risk profile (e.g. forward or option), and the delivery period (e.g. by month and year). The following describes the categories of activities represented by their operating characteristics and key risks:

•Asset Optimization — Represents derivative activity associated with assets owned and contracted by DTE Energy, including forward natural gas purchases and sales, natural gas transportation, and storage capacity. Changes in the value of derivatives in this category typically economically offset changes in the value of underlying non-derivative positions, which do not qualify for fair value accounting. The difference in accounting treatment of derivatives in this category and the underlying non-derivative positions can result in significant earnings volatility.

•Marketing and Origination — Represents derivative activity transacted by originating substantially hedged positions with wholesale energy marketers, producers, end-users, utilities, retail aggregators, and alternative energy suppliers.

•Fundamentals Based Trading — Represents derivative activity transacted with the intent of taking a view, capturing market price changes, or putting capital at risk. This activity is speculative in nature as opposed to hedging an existing exposure.

•Other — Includes derivative activity at DTE Electric related to FTRs. Changes in the value of derivative contracts at DTE Electric are recorded as Derivative assets or liabilities, with an offset to Regulatory assets or liabilities as the settlement value of these contracts will be included in the PSCR mechanism when realized.

43

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The following table presents the fair value of derivative instruments for DTE Energy:

	September 30, 2021				December 31, 2020
	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
	(In millions)
Derivatives designated as hedging instruments
Foreign currency exchange contracts	$	—	$	(3)	$	—	$	(4)
Derivatives not designated as hedging instruments
Commodity contracts
Natural gas	$	778	$	(1,055)	$	233	$	(223)
Electricity	952		(916)		180		(168)
Environmental & Other	610		(581)		154		(137)
Foreign currency exchange contracts	—		(2)		—		(1)
Total derivatives not designated as hedging instruments	$	2,340	$	(2,554)	$	567	$	(529)
Current	$	1,938	$	(2,011)	$	446	$	(386)
Noncurrent	402		(546)		121		(147)
Total derivatives	$	2,340	$	(2,557)	$	567	$	(533)

The following table presents the fair value of derivative instruments for DTE Electric:

	September 30, 2021		December 31, 2020
	(In millions)
FTRs — Other current assets	$	12	$	4
Total derivatives not designated as hedging instruments	$	12	$	4

Certain of DTE Energy's derivative positions are subject to netting arrangements which provide for offsetting of asset and liability positions as well as related cash collateral. Such netting arrangements generally do not have restrictions. Under such netting arrangements, DTE Energy offsets the fair value of derivative instruments with cash collateral received or paid for those contracts executed with the same counterparty, which reduces DTE Energy's Total Assets and Liabilities. Cash collateral is allocated between the fair value of derivative instruments and customer accounts receivable and payable with the same counterparty on a pro-rata basis to the extent there is exposure. Any cash collateral remaining, after the exposure is netted to zero, is reflected in Accounts receivable and Accounts payable as collateral paid or received, respectively.

DTE Energy also provides and receives collateral in the form of letters of credit which can be offset against net Derivative assets and liabilities as well as Accounts receivable and payable. DTE Energy had issued letters of credit of $20 million and $7 million outstanding at September 30, 2021 and December 31, 2020, respectively, which could be used to offset net Derivative liabilities. Letters of credit received from third parties which could be used to offset net Derivative assets were $55 million and $9 million at September 30, 2021 and December 31, 2020, respectively. Such balances of letters of credit are excluded from the tables below and are not netted with the recognized assets and liabilities in DTE Energy's Consolidated Statements of Financial Position.

For contracts with certain clearing agents, the fair value of derivative instruments is netted against realized positions with the net balance reflected as either 1) a Derivative asset or liability or 2) an Account receivable or payable. Other than certain clearing agents, Accounts receivable and Accounts payable that are subject to netting arrangements have not been offset against the fair value of Derivative assets and liabilities.

44

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The following table presents net cash collateral offsetting arrangements for DTE Energy:

	September 30, 2021		December 31, 2020
	(In millions)
Cash collateral netted against Derivative assets	$	(122)	$	(12)
Cash collateral netted against Derivative liabilities	58		6
Cash collateral recorded in Accounts receivable(a)	66		14
Cash collateral recorded in Accounts payable(a)	(8)		(1)
Total net cash collateral posted (received)	$	(6)	$	7

_______________________________________

(a)Amounts are recorded net by counterparty.

The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:

	September 30, 2021						December 31, 2020
	Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position		Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
	(In millions)
Derivative assets
Commodity contracts
Natural gas	$	778	$	(715)	$	63	$	233	$	(156)	$	77
Electricity	952		(627)		325		180		(120)		60
Environmental & Other	610		(570)		40		154		(135)		19
Total derivative assets	$	2,340	$	(1,912)	$	428	$	567	$	(411)	$	156
Derivative liabilities
Commodity contracts
Natural gas	$	(1,055)	$	664	$	(391)	$	(223)	$	151	$	(72)
Electricity	(916)		614		(302)		(168)		125		(43)
Environmental & Other	(581)		570		(11)		(137)		129		(8)
Foreign currency exchange contracts	(5)		—		(5)		(5)		—		(5)
Total derivative liabilities	$	(2,557)	$	1,848	$	(709)	$	(533)	$	405	$	(128)

The following table presents the netting offsets of Derivative assets and liabilities showing the reconciliation of derivative instruments to DTE Energy's Consolidated Statements of Financial Position:

	September 30, 2021								December 31, 2020
	Derivative Assets				Derivative Liabilities				Derivative Assets				Derivative Liabilities
	Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
	(In millions)
Total fair value of derivatives	$	1,938	$	402	$	(2,011)	$	(546)	$	446	$	121	$	(386)	$	(147)
Counterparty netting	(1,498)		(292)		1,498		292		(318)		(81)		318		81
Collateral adjustment	(93)		(29)		48		10		(12)		—		—		6
Total derivatives as reported	$	347	$	81	$	(465)	$	(244)	$	116	$	40	$	(68)	$	(60)

45

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations is as follows:

	Location of Gain (Loss) Recognized in Income on Derivatives	Gain (Loss) Recognized in Income on Derivatives for the Three Months Ended September 30,				Gain (Loss) Recognized in Income on Derivatives for the Nine Months Ended September 30,
		2021		2020		2021		2020
		(In millions)
Commodity contracts
Natural gas	Operating Revenues — Non-utility operations	$	(214)	$	(27)	$	(371)	$	(63)
Natural gas	Fuel, purchased power, gas, and other — non-utility	63		(51)		(16)		28
Electricity	Operating Revenues — Non-utility operations	68		33		143		75
Environmental & Other	Operating Revenues — Non-utility operations	3		2		(36)		(40)
Foreign currency exchange contracts	Operating Revenues — Non-utility operations	2		(2)		(1)		—
Total		$	(78)	$	(45)	$	(281)	$	—

Revenues and energy costs related to trading contracts are presented on a net basis in DTE Energy's Consolidated Statements of Operations. Commodity derivatives used for trading purposes, and financial non-trading commodity derivatives, are accounted for using the MTM method with unrealized and realized gains and losses recorded in Operating Revenues — Non-utility operations. Non-trading physical commodity sale and purchase derivative contracts are generally accounted for using the MTM method with unrealized and realized gains and losses for sales recorded in Operating Revenues — Non-utility operations and purchases recorded in Fuel, purchased power, gas, and other — non-utility.

The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of September 30, 2021:

Commodity	Number of Units
Natural gas (MMBtu)	2,096,409,912
Electricity (MWh)	29,383,562
Foreign currency exchange ($ CAD)	119,281,865
Renewable Energy Certificates (MWh)	8,387,594
Carbon emissions (Metric Tons)	48,343,793

Various subsidiaries of DTE Energy have entered into contracts which contain ratings triggers and are guaranteed by DTE Energy. These contracts contain provisions which allow the counterparties to require that DTE Energy post cash or letters of credit as collateral in the event that DTE Energy’s credit rating is downgraded below investment grade. Certain of these provisions (known as "hard triggers") state specific circumstances under which DTE Energy can be required to post collateral upon the occurrence of a credit downgrade, while other provisions (known as "soft triggers") are not as specific. For contracts with soft triggers, it is difficult to estimate the amount of collateral which may be requested by counterparties and/or which DTE Energy may ultimately be required to post. The amount of such collateral which could be requested fluctuates based on commodity prices (primarily natural gas, power, environmental, and coal) and the provisions and maturities of the underlying transactions. As of September 30, 2021, DTE Energy's contractual obligation to post collateral in the form of cash or letters of credit in the event of a downgrade to below investment grade, under both hard trigger and soft trigger provisions, was $575 million.

As of September 30, 2021, DTE Energy had $2,180 million of derivatives in net liability positions, for which hard triggers exist. There is $52 million of collateral that has been posted against such liabilities, including cash and letters of credit. Associated derivative net asset positions for which contractual offset exists were $1,788 million. The net remaining amount of $340 million is derived from the $575 million noted above.

46

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 10 — LONG-TERM DEBT

Debt Issuances

In 2021, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	March	Mortgage bonds(a)	1.90%	2028	$	575
DTE Electric	March	Mortgage bonds(a)	3.25%	2051	425
DT Midstream	June	Senior notes(b)	4.125%	2029	1,100
DT Midstream	June	Senior notes(b)	4.375%	2031	1,000
DT Midstream	June	Term loan facility(b)	Variable	2028	1,000
					$	4,100

_______________________________________

(a)Bonds were issued as Green Bonds and the proceeds will be used to finance qualified expenditures for solar and wind energy, payments under power purchase agreements for solar and wind energy, and energy optimization programs.

(b)Proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. The debt was transferred to DT Midstream upon its separation on July 1, 2021. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information and to the Debt Redemptions section below for DTE Energy's use of the proceeds received from DT Midstream.

In September 2021, DTE Electric completed a mandatory remarketing of $82 million of 1.45% Tax-Exempt Revenue Bonds at the same rate of 1.45% until maturity in 2030 and $59 million of 1.45% Tax-Exempt Revenue Bonds at a rate of 1.35% until maturity in 2029.

Additionally in September 2021, DTE Gas agreed to issue $60 million of 2.07% First Mortgage Bonds due December 1, 2031 and $95 million of 2.85% First Mortgage Bonds due December 1, 2051 to a group of institutional investors in a private placement transaction. These bonds are expected to close and fund in November 2021. Proceeds will be used for the repayment of short-term borrowings and general corporate purposes, including capital expenditures.

Debt Redemptions

In 2021, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	April	Mortgage bonds	3.90%	2021	$	250
DTE Electric	May	Mortgage bonds	7.00%	2021	33
DTE Energy	June	Junior subordinated debentures(a)	5.375%	2076	300
DTE Energy	July	Senior notes	3.30%	2022	300
DTE Energy	July	Senior notes	2.60%	2022	300
DTE Energy	July	Senior notes	3.70%	2023	600
DTE Energy	July	Senior notes	3.85%	2023	135
DTE Energy	July	Senior notes	3.50%	2024	350
DTE Energy	July	Senior notes	3.80%	2027	350
DTE Energy	July	Senior notes	3.40%	2029	21
DTE Energy	July	Senior notes	6.375%	2033	191
DTE Energy	August	Senior notes	3.85%	2023	165
DTE Energy	August	Senior notes	6.375%	2033	209
DTE Electric	August	Mortgage bonds	6.90%	2021	38
					$	3,242

_______________________________________

(a)Early redemption resulted in a loss on extinguishment of debt of $8 million relating to the write-off of unamortized issuance costs.

47

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

During the third quarter 2021, DTE Energy optionally redeemed $2.6 billion of Senior Notes included in the table above using proceeds from DT Midstream's repayment of short-term borrowings and one-time special dividend. To early retire this debt and reduce future interest expense, DTE Energy incurred prepayment costs of $361 million and wrote off $15 million of unamortized issuance costs and discounts related to the debt. These amounts have been included within the Loss on extinguishment of debt line item within the Consolidated Statements of Operations for the three and nine months ended September 30, 2021.

NOTE 11 — SHORT-TERM CREDIT ARRANGEMENTS AND BORROWINGS

DTE Energy, DTE Electric, and DTE Gas have unsecured revolving credit agreements that can be used for general corporate borrowings, but are intended to provide liquidity support for each of the companies’ commercial paper programs. Borrowings under the revolvers are available at prevailing short-term interest rates. DTE Energy also has other facilities to support letter of credit issuance.

The unsecured revolving credit agreements have historically required DTE Energy, DTE Electric, and DTE Gas to maintain a total funded debt to capitalization ratio of no more than 0.65 to 1. In June 2021, DTE Energy amended its total funded debt to capitalization ratio requirement to no more than 0.70 to 1 starting with the third quarter of 2021 and ending December 2022. The amendment was a result of temporary balance sheet impacts resulting from the separation of DT Midstream on July 1, 2021. In the agreements, "total funded debt" means all indebtedness of each respective company and their consolidated subsidiaries, including finance lease obligations, hedge agreements, and guarantees of third parties’ debt, but excluding contingent obligations, nonrecourse and junior subordinated debt, and certain equity-linked securities and, except for calculations at the end of the second quarter, certain DTE Gas short-term debt. "Capitalization" means the sum of (a) total funded debt plus (b) "consolidated net worth," which is equal to consolidated total equity of each respective company and their consolidated subsidiaries (excluding pension effects under certain FASB statements), as determined in accordance with accounting principles generally accepted in the United States of America. At September 30, 2021, the total funded debt to total capitalization ratios for DTE Energy, DTE Electric, and DTE Gas were 0.66 to 1, 0.51 to 1, and 0.46 to 1, respectively, and were in compliance with this financial covenant.

The availability under these facilities as of September 30, 2021 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured revolving credit facility, expiring April 2025(a)	$	1,500	$	500	$	300	$	2,300
Unsecured Canadian revolving credit facility, expiring May 2023	87		—		—		87
Unsecured letter of credit facility, expiring in February 2023	150		—		—		150
Unsecured letter of credit facility, expiring in July 2023	70		—		—		70
Unsecured letter of credit facility(b)	50		—		—		50
	1,857		500		300		2,657
Amounts outstanding at September 30, 2021
Revolver borrowings	74		—		—		74
Commercial paper issuances	—		159		128		287
Letters of credit	268		—		—		268
	342		159		128		629
Net availability at September 30, 2021	$	1,515	$	341	$	172	$	2,028

_______________________________________

(a)Total availability of $102 million expires in April 2024, including $67 million at DTE Energy, $22 million at DTE Electric, and $13 million at DTE Gas. All other availability expires in April 2025.

(b)Uncommitted letter of credit facility with automatic renewal provision for each July and therefore no expiration.

48

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

In conjunction with maintaining certain exchange-traded risk management positions, DTE Energy may be required to post collateral with its clearing agents. DTE Energy has demand financing agreements with its clearing agents, including an agreement for up to $100 million with an indefinite term and an agreement for up to $150 million currently contracted through 2022 and subject to renewal. The $100 million agreement, as amended, also allows for up to $50 million of additional margin financing provided that DTE Energy posts a letter of credit for the incremental amount. Both agreements allow the right of setoff with posted collateral. At September 30, 2021, the capacity under the facilities was $300 million. The amounts outstanding under the agreements were $4 million and $49 million at September 30, 2021 and December 31, 2020, respectively, and were fully offset by the posted collateral.

NOTE 12 — LEASES

Lessor

During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.

The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:

	DTE Energy
	September 30, 2021
	(In millions)
2021	$	6
2022	22
2023	22
2024	22
2025	22
2026 and Thereafter	292
Total minimum future lease receipts	386
Residual value of leased pipeline	17
Less unearned income	202
Net investment in finance lease	201
Less current portion	7
	$	194

Interest income recognized under finance leases was $4 million for the three months ended September 30, 2021 and 2020 and $13 million and $12 million for the nine months ended September 30, 2021 and 2020, respectively.

DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Fixed payments	$	13	$	14	$	42	$	43
Variable payments	55		43		90		82
	$	68	$	57	$	132	$	125
Operating revenues	$	26	$	26	$	70	$	74
Other income	42		31		62		51
	$	68	$	57	$	132	$	125

49

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 13 — COMMITMENTS AND CONTINGENCIES

Environmental

DTE Electric

Air — DTE Electric is subject to the EPA ozone and fine particulate transport and acid rain regulations that limit power plant emissions of SO2 and NOX. The EPA and the State of Michigan have also issued emission reduction regulations relating to ozone, fine particulate, regional haze, mercury, and other air pollution. These rules have led to controls on fossil-fueled power plants to reduce SO2, NOX, mercury, and other emissions. Additional rulemakings may occur over the next few years which could require additional controls for SO2, NOX, and other hazardous air pollutants.

The EPA proposed revised air quality standards for ground level ozone in November 2014 and specifically requested comments on the form and level of the ozone standards. The standards were finalized in October 2015. The State of Michigan recommended to the EPA in October 2016 which areas of the state are not attaining the new standard. On April 30, 2018, the EPA finalized the State of Michigan's recommended marginal non-attainment designation for southeast Michigan. The State is required to develop and implement a plan to address the southeast Michigan ozone non-attainment area by the end of 2021. The Registrants cannot predict the scope and associated financial impact of the State's plan to address the ozone non-attainment area at this time.

The EPA has implemented regulatory actions under the Clean Air Act to address emissions of GHGs from the utility sector and other sectors of the economy. Among these actions, in 2015 the EPA finalized performance standards for emissions of carbon dioxide from new and existing fossil-fuel fired EGUs. The performance standards for existing EGUs, known as the EPA Clean Power Plan, were challenged by petitioners and stayed by the U.S. Supreme Court in February 2016 pending final review by the courts. On October 10, 2017, the EPA, under a new administration, proposed to rescind the Clean Power Plan, and in August 2018, the EPA proposed revised emission guidelines for GHGs from existing EGUs. On June 19, 2019, the EPA Administrator officially repealed the Clean Power Plan and finalized its replacement, named the ACE rule. The ACE rule was vacated and remanded back to the EPA in a D.C. Circuit Court decision on January 19, 2021. The next steps taken by the EPA with respect to regulation of GHGs from EGUs is uncertain. Regardless of future rules, DTE Energy remains committed for its electric utility operations to reduce carbon emissions 32% by 2023, 50% by 2028, and 80% by 2040 from 2005 carbon emissions levels, and its goal of net zero emissions for its electric utility operations by 2050.

In addition to the GHG standards for existing EGUs, in December 2018, the EPA issued proposed revisions to the carbon dioxide performance standards for new, modified, or reconstructed fossil-fuel fired EGUs. The rule was finalized on January 13, 2021 and immediately challenged. An order vacating the rule was filed by the D.C. Circuit Court of Appeals on April 5, 2021. The carbon standards for new sources are not expected to have a material impact on DTE Electric, since DTE Electric has no plans to build new coal-fired generation and any potential new gas generation will be able to comply with the standards.

Pending or future legislation or other regulatory actions could have a material impact on DTE Electric's operations and financial position and the rates charged to its customers. Impacts include expenditures for environmental equipment beyond what is currently planned, financing costs related to additional capital expenditures, the purchase of emission credits from market sources, higher costs of purchased power, and the retirement of facilities where control equipment is not economical. DTE Electric would seek to recover these incremental costs through increased rates charged to its utility customers, as authorized by the MPSC.

To comply with air pollution requirements, DTE Electric has spent approximately $2.4 billion. DTE Electric does not anticipate additional capital expenditures for air pollution requirements, subject to the results of future rulemakings.

Water — In response to an EPA regulation, DTE Electric was required to examine alternatives for reducing the environmental impacts of the cooling water intake structures at several of its facilities. Based on the results of completed studies and expected future studies, DTE Electric may be required to install technologies to reduce the impacts of the water intake structures. A final rule became effective in October 2014. The final rule requires studies to be completed and submitted as part of the NPDES permit application process to determine the type of technology needed to reduce impacts to fish. DTE Electric has initiated the process of completing the required studies. Final compliance for the installation of any required technology will be determined by the state on a case by case, site specific basis. DTE Electric is currently evaluating the compliance options and working with the State of Michigan on evaluating whether any controls are needed. These evaluations/studies may require modifications to some existing intake structures. It is not possible to quantify the impact of this rule making at this time.

50

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Contaminated and Other Sites — Prior to the construction of major interstate natural gas pipelines, gas for heating and other uses was manufactured locally from processes involving coal, coke, or oil. The facilities, which produced gas, have been designated as MGP sites. DTE Electric conducted remedial investigations at contaminated sites, including three former MGP sites. Cleanup of one of the MGP sites is complete, and the site is closed. The investigations have revealed contamination related to the by-products of gas manufacturing at each MGP site. In addition to the MGP sites, DTE Electric is also in the process of cleaning up other contaminated sites, including the area surrounding an ash landfill, electrical distribution substations, electric generating power plants, and underground and above ground storage tank locations. The findings of these investigations indicated that the estimated cost to remediate these sites is expected to be incurred over the next several years. At September 30, 2021 and December 31, 2020, DTE Electric had $13 million and $10 million, respectively, accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Electric’s financial position and cash flows. DTE Electric believes the likelihood of a material change to the accrued amount is remote based on current knowledge of the conditions at each site.

Coal Combustion Residuals and Effluent Limitations Guidelines — A final EPA rule for the disposal of coal combustion residuals, commonly known as coal ash, became effective in October 2015, and was revised in October 2016, July 2018, September 2020, and November 2020. The rule is based on the continued listing of coal ash as a non-hazardous waste and relies on various self-implementation design and performance standards. DTE Electric owns and operates three permitted engineered coal ash storage facilities to dispose of coal ash from coal-fired power plants and operates a number of smaller impoundments at its power plants subject to certain provisions in the CCR rule. At certain facilities, the rule currently requires ongoing sampling and testing of monitoring wells, compliance with groundwater standards, and the closure of basins at the end of the useful life of the associated power plant.

On September 28, 2020, the CCR rule "A Holistic Approach to Closure Part A: Deadline to Initiate Closure and Enhancing Public Access to Information" became effective and established April 11, 2021 as the new deadline for all unlined impoundments (including units previously classified as "clay-lined") to initiate closure. Additionally, the rule amends certain reporting requirements and CCR website requirements. On November 12, 2020, an additional revision to the CCR Rule "A Holistic Approach to Closure Part B: Alternate Demonstration for Unlined Surface Impoundments" was published in the Federal Register that provides a process to determine if certain unlined impoundments consist of an alternative liner system that may be as protective as the current liners specified in the CCR rule, and therefore may continue to operate. DTE Electric has submitted applications to the EPA that support continued use of all impoundments through their active lives. The forced closure date of April 11, 2021 is effectively delayed while the EPA's review has extended beyond this date.

At the State level, legislation was signed by the Governor in December 2018 and provides for further regulation of the CCR program in Michigan. Additionally, the bill provides the basis of a CCR program that EGLE has submitted to the EPA for approval to fully regulate the CCR program in Michigan in lieu of a Federal permit program.

On April 12, 2017, the EPA granted a petition for reconsideration of the 2015 ELG Rule. The EPA also signed an administrative stay of the 2015 ELG Rule’s compliance deadlines for fly ash transport water, bottom ash transport water, and flue gas desulfurization (FGD) wastewater, among others. On June 6, 2017, the EPA published in the Federal Register a proposed rule (Postponement Rule) to postpone certain applicable deadlines within the 2015 ELG rule. The Postponement Rule was published on September 18, 2017. The Postponement Rule nullified the administrative stay but also extended the earliest compliance deadlines for only FGD wastewater and bottom ash transport water until November 1, 2020 in order for the EPA to propose and finalize a new ruling. On October 13, 2020, the EPA finalized the ELG Reconsideration Rule which revised the regulations from the 2015 ELG rule. The Reconsideration Rule revises requirements for two specific waste streams produced by steam electric power plants: FGD wastewater and bottom ash transport water. The Reconsideration Rule also provides additional compliance opportunities by finalizing low utilization and cessation of coal burning subcategories. The Reconsideration Rule provides new opportunities for DTE Electric to evaluate existing ELG compliance strategies and make any necessary adjustments to ensure full compliance with the ELGs in a cost-effective manner.

In October 2020, the EPA published in the Federal Register the final version of the ELG Reconsideration Rule which updates the 2015 ELG Rule. The Reconsideration Rule re-establishes the technology-based effluent limitations guidelines and standards applicable to FGD wastewater and bottom ash transport water. The EPA set the applicability dates for bottom ash transport water and FGD wastewater retrofits to be "as soon as possible" beginning October 13, 2021 and no later than December 31, 2025.

51

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Compliance schedules for individual facilities and individual waste streams are determined through issuance of new NPDES permits by the State of Michigan. The State of Michigan has issued an NPDES permit for the Belle River power plant establishing compliance deadlines based on the 2020 Reconsideration Rule. The deadline is December 31, 2025 if DTE Electric chooses to comply by installation of new treatment technologies, or December 31, 2028 if DTE Electric chooses to pursue the cessation of coal as their ELG compliance option.

On July 27, 2021, the EPA announced they will revisit some of the compliance requirements that were established in the 2020 Reconsideration Rule and plan to release a new proposed rule in Fall of 2022. The 2020 Reconsideration Rule remains in effect until that time.

On October 11, 2021, in consideration of the deadlines above, DTE Electric submitted the appropriate documentation titled the Notice of Planned Participation (NOPP) to the State of Michigan that formally announced the intent to pursue cessation of coal at the Belle River power plant as their ELG compliance option. No new permits that would require ELG compliance have been issued for other facilities, consequently no compliance timelines have been established.

DTE Electric continues to evaluate compliance strategies, technologies and system designs for both FGD wastewater and bottom ash transport water system to achieve compliance with the EPA rules.

DTE Electric has estimated the impact of the CCR and ELG rules to be $661 million of capital expenditures, including $516 million for 2021 through 2025.

DTE Gas

Air — In June 2020, DTE Energy expanded its net zero goal to include its gas utility operations by committing to reduce greenhouse gas emissions to net zero by 2050 from procurement of natural gas through delivery. As part of DTE Energy's 2050 net zero commitment, DTE Gas launched its CleanVision Natural Gas Balance program in January 2021 that offers customers a way to reduce their carbon footprint using carbon offsets and renewable natural gas. The carbon offset program is focused on protecting Michigan forests that naturally absorb carbon dioxide.

Contaminated and Other Sites — DTE Gas owns or previously owned 14 former MGP sites. Investigations have revealed contamination related to the by-products of gas manufacturing at each site. Cleanup of eight of the MGP sites is complete, and the sites are closed. DTE Gas has also completed partial closure of four additional sites. Cleanup activities associated with the remaining sites will continue over the next several years. The MPSC has established a cost deferral and rate recovery mechanism for investigation and remediation costs incurred at former MGP sites. In addition to the MGP sites, DTE Gas is also in the process of cleaning up other contaminated sites, including gate stations, gas pipeline releases, and underground storage tank locations. As of September 30, 2021 and December 31, 2020, DTE Gas had $24 million accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Gas' financial position and cash flows. DTE Gas anticipates the cost amortization methodology approved by the MPSC, which allows for amortization of the MGP costs over a ten-year period beginning with the year subsequent to the year the MGP costs were incurred, will prevent the associated investigation and remediation costs from having a material adverse impact on DTE Gas' results of operations.

Non-utility

DTE Energy's non-utility businesses are subject to a number of environmental laws and regulations dealing with the protection of the environment from various pollutants.

In March 2019, the EPA issued an FOV to EES Coke, the Michigan coke battery facility that is a wholly-owned subsidiary of DTE Energy, alleging that the 2008 and 2014 permits issued by EGLE did not comply with the Clean Air Act. In September 2020, the EPA issued another FOV alleging EES Coke's 2018 and 2019 SO2 emissions exceeded projections and hence violated non-attainment new source review requirements. EES Coke evaluated the EPA's alleged violations and believes that the permits approved by EGLE complied with the Clean Air Act. EES Coke also responded to the EPA's September 2020 allegations demonstrating its actual emissions are compliant with non-attainment new source review requirements. Discussions with the EPA are ongoing. At the present time, DTE Energy cannot predict the outcome or financial impact of this FOV.

52

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Other

In 2010, the EPA finalized a new one-hour SO2 ambient air quality standard that requires states to submit plans and associated timelines for non-attainment areas that demonstrate attainment with the new SO2 standard in phases. Phase 1 addresses non-attainment areas designated based on ambient monitoring data. Phase 2 addresses non-attainment areas with large sources of SO2 and modeled concentrations exceeding the National Ambient Air Quality Standards for SO2. Phase 3 addresses smaller sources of SO2 with modeled or monitored exceedances of the new SO2 standard.

Michigan's Phase 1 non-attainment area includes DTE Energy facilities in southwest Detroit and areas of Wayne County. Modeling runs by EGLE suggest that emission reductions may be required by significant sources of SO2 emissions in these areas, including DTE Electric power plants and DTE Energy's Michigan coke battery facility. As part Michigan's SIP process, DTE Energy has worked with EGLE to develop air permits reflecting significant SO2 emission reductions that, in combination with other non-DTE Energy sources' emission reduction strategies, will help the state attain the standard and sustain its attainment. The Michigan SIP was completed and submitted to the EPA on May 31, 2016 and supplemented on June 30, 2016. On March 19, 2021, the EPA published in the Federal Register partial approval and partial disapproval of Michigan's Detroit SO2 non-attainment area plan. The partial disapproval does not appear to impact DTE's sources and further discussions are underway with the EPA to finalize the plan. Since several non-DTE Energy sources are also part of the proposed compliance plan, DTE Energy is unable to determine the full impact of any further emissions reductions that may be required from DTE's facilities at this time.

Michigan's Phase 2 non-attainment area includes DTE Electric facilities in St. Clair County. EGLE has not made a final determination on SIP strategy for this area, pending the EPA's review of their clean data determination request. Until agency plans are final, DTE Energy is unable to determine the impacts.

Synthetic Fuel Guarantees

DTE Energy discontinued the operations of its synthetic fuel production facilities throughout the United States as of December 31, 2007. DTE Energy provided certain guarantees and indemnities in conjunction with the sales of interests in its synfuel facilities. The guarantees cover potential commercial, environmental, oil price, and tax-related obligations that will survive until 90 days after expiration of all applicable statutes of limitations. DTE Energy estimates that its maximum potential liability under these guarantees at September 30, 2021 was approximately $400 million. Payment under these guarantees is considered remote.

REF Guarantees

DTE Energy has provided certain guarantees and indemnities in conjunction with the sales of interests in or lease of its REF facilities. The guarantees cover potential commercial, environmental, and tax-related obligations that will survive until 90 days after expiration of all applicable statutes of limitations. DTE Energy estimates that its maximum potential liability under these guarantees at September 30, 2021 was $698 million. Payments under these guarantees are considered remote.

Other Guarantees

In certain limited circumstances, the Registrants enter into contractual guarantees. The Registrants may guarantee another entity’s obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. Finally, the Registrants may provide indirect guarantees for the indebtedness of others. DTE Energy’s guarantees are not individually material with maximum potential payments totaling $40 million at September 30, 2021. Payments under these guarantees are considered remote.

The Registrants are periodically required to obtain performance surety bonds in support of obligations to various governmental entities and other companies in connection with its operations. As of September 30, 2021, DTE Energy had $171 million of performance bonds outstanding, including $120 million for DTE Electric. In the event that such bonds are called for nonperformance, the Registrants would be obligated to reimburse the issuer of the performance bond. The Registrants are released from the performance bonds as the contractual performance is completed and does not believe that a material amount of any currently outstanding performance bonds will be called.

53

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Labor Contracts

There are several bargaining units for DTE Energy subsidiaries' approximate 5,100 represented employees, including DTE Electric's approximately 2,700 represented employees. This represents 50% and 57% of DTE Energy's and DTE Electric's total employees, respectively. Of these represented employees, approximately 16% and 21% have contracts expiring within one year for DTE Energy and DTE Electric, respectively.

Purchase Commitments

Utility capital expenditures, expenditures for non-utility businesses, and contributions to equity method investees will be approximately $3.9 billion and $3.0 billion in 2021 for DTE Energy and DTE Electric, respectively. The Registrants have made certain commitments in connection with the estimated 2021 annual capital expenditures and contributions to equity method investees.

COVID-19 Pandemic

DTE Energy has been actively monitoring the impact of the COVID-19 pandemic on supply chains, markets, counterparties, and customers, and any related impacts on operating costs, customer demand, and recoverability of assets that could materially impact the Registrants' financial results.

In 2021, the COVID-19 pandemic has continued to impact DTE Electric sales volumes. As businesses have maintained certain remote operations, related sales volumes have been lower for commercial and industrial customers and higher for residential customers as compared to historical volumes before the pandemic. This impact contributed to a net reduction in DTE Electric sales, but has been offset by favorable rate mix.

In 2020, COVID-19 also resulted in incremental costs at our utilities related to personal protective equipment and other health and safety-related matters, as well as lower volumes for certain companies within the DTE Vantage segment. For the three and nine months ended September 30, 2021, however, there has not been any significant impact to the Registrants' Consolidated Financial Statements.

In consideration of the above factors and all other current and expected impacts to the Registrants' performance and cash flows resulting from the COVID-19 pandemic, there have been no material adjustments or reserves deemed necessary as of September 30, 2021. The Registrants cannot predict the future impacts of the COVID-19 pandemic on the Consolidated Financial Statements, as developments involving COVID-19 and its related effects on economic and operating conditions remain highly uncertain.

Other Contingencies

The Registrants are involved in certain other legal, regulatory, administrative, and environmental proceedings before various courts, arbitration panels, and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits, inquiries from various regulators, and pending judicial matters. The Registrants cannot predict the final disposition of such proceedings. The Registrants regularly review legal matters and record provisions for claims that they can estimate and are considered probable of loss. The resolution of these pending proceedings is not expected to have a material effect on the Registrants' Consolidated Financial Statements in the periods they are resolved.

For a discussion of contingencies related to regulatory matters and derivatives, see Notes 6 and 9 to the Consolidated Financial Statements, "Regulatory Matters" and "Financial and Other Derivative Instruments," respectively.

54

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

NOTE 14 — RETIREMENT BENEFITS AND TRUSTEED ASSETS

The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	27	$	25	$	8	$	7
Interest cost	39		46		12		14
Expected return on plan assets	(84)		(84)		(33)		(32)
Amortization of:
Net actuarial loss	49		43		3		4
Prior service credit	—		—		(5)		(5)
Settlements	—		2		—		—
Net periodic benefit cost (credit)	$	31	$	32	$	(15)	$	(12)

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	81	$	74	$	23	$	20
Interest cost	118		139		35		42
Expected return on plan assets	(254)		(250)		(97)		(96)
Amortization of:
Net actuarial loss	147		129		10		12
Prior service credit	—		—		(15)		(15)
Settlements	—		2		—		—
Net periodic benefit cost (credit)	$	92	$	94	$	(44)	$	(37)

DTE Electric participates in various plans that provide pension and other postretirement benefits for DTE Energy and its affiliates. The plans are primarily sponsored by DTE Energy's subsidiary, DTE Energy Corporate Services, LLC. DTE Electric accounts for its participation in DTE Energy's qualified and non-qualified pension plans by applying multiemployer accounting. DTE Electric accounts for its participation in other postretirement benefit plans by applying multiple-employer accounting. Within multiemployer and multiple-employer plans, participants pool plan assets for investment purposes and to reduce the cost of plan administration. The primary difference between plan types is assets contributed in multiemployer plans can be used to provide benefits for all participating employers, while assets contributed within a multiple-employer plan are restricted for use by the contributing employer. As a result of multiemployer accounting treatment, capitalized costs associated with these plans are reflected in Property, plant, and equipment in DTE Electric's Consolidated Statements of Financial Position. The same capitalized costs are reflected as Regulatory assets and liabilities in DTE Energy's Consolidated Statements of Financial Position. In addition, the service cost and non-service cost components are presented in Operation and maintenance in DTE Electric's Consolidated Statements of Operations. The same non-service cost components are presented in Other (Income) and Deductions — Non-operating retirement benefits, net in DTE Energy's Consolidated Statements of Operations. Plan participants of all plans are solely DTE Energy and affiliate participants.

DTE Energy's subsidiaries are responsible for their share of qualified and non-qualified pension benefit costs. DTE Electric's allocated portion of pension benefit costs included in capital expenditures and operating and maintenance expense was $26 million and $28 million for the three months ended September 30, 2021 and 2020, respectively, and $78 million and $79 million for the nine months ended September 30, 2021 and 2020, respectively. These amounts include recognized contractual termination benefit charges, curtailment gains, and settlement charges.

55

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

The following tables detail the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	6	$	5	$	17	$	15
Interest cost	8		11		25		32
Expected return on plan assets	(22)		(21)		(65)		(65)
Amortization of:
Net actuarial loss	3		2		9		8
Prior service credit	(3)		(3)		(10)		(10)
Net periodic benefit credit	$	(8)	$	(6)	$	(24)	$	(20)

Pension and Other Postretirement Contributions

At the discretion of management and depending upon financial market conditions, DTE Energy anticipates making up to $7 million in contributions to the qualified pension plans in 2021. No amounts relate to DTE Electric and no contributions are anticipated for DTE Energy's postretirement benefit plans in 2021.

NOTE 15 — SEGMENT AND RELATED INFORMATION

DTE Energy sets strategic goals, allocates resources, and evaluates performance based on the following structure:

Electric segment consists principally of DTE Electric, which is engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.3 million residential, commercial, and industrial customers in southeastern Michigan.

Gas segment consists principally of DTE Gas, which is engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million residential, commercial, and industrial customers throughout Michigan and the sale of storage and transportation capacity.

DTE Vantage, formerly the Power and Industrial Projects segment, is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial, and institutional customers, produce reduced emissions fuel, and sell electricity and pipeline-quality gas from renewable energy projects.

Energy Trading consists of energy marketing and trading operations.

Corporate and Other includes various holding company activities, holds certain non-utility debt, and holds certain investments, including funds supporting regional development and economic growth.

DTE Energy completed the separation of DT Midstream on July 1, 2021, which was comprised of the Gas Storage and Pipelines segment and also certain DTE Energy holding company activity within the Corporate and Other segment. Amounts relating to DT Midstream have been classified as discontinued operations, and Gas Storage and Pipelines is no longer a reportable segment of DTE Energy. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information.

The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of tax credits and net operating losses, if applicable. The state and local income tax provisions of the utility subsidiaries are also determined on an individual company basis and recognize the tax benefit of various tax credits and net operating losses, if applicable. The subsidiaries record federal, state, and local income taxes payable to or receivable from DTE Energy based on the federal, state, and local tax provisions of each company.

56

DTE Energy Company — DTE Electric Company

Combined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, natural gas sales, and renewable natural gas sales in the following segments:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric	$	17	$	16	$	48	$	46
Gas	3		4		10		12
DTE Vantage	125		134		463		308
Energy Trading	9		9		35		23
Corporate and Other	1		1		2		2
	$	155	$	164	$	558	$	391

Financial data of DTE Energy's business segments follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Utility operations
Electric	$	1,700	$	1,690	$	4,468	$	4,211
Gas	193		173		1,070		964
Operating Revenues — Non-utility operations
Electric	2		3		9		10
DTE Vantage	372		324		1,132		850
Energy Trading	1,602		1,061		4,208		2,714
Corporate and Other	1		1		2		2
Reconciliation and Eliminations(a)	(155)		(172)		(572)		(408)
Total	$	3,715	$	3,080	$	10,317	$	8,343

_______________________________________

(a)Includes $14 million for the nine months ended September 30, 2021 and $8 million and $17 million for the three and nine months ended September 30, 2020, respectively, for eliminations related to DTE Energy's prior Gas Storage and Pipelines segment that remain in continuing operations. Eliminations for these revenues are offset by related cost eliminations and have no impact on DTE Energy net income.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric	$	342	$	398	$	788	$	675
Gas	(30)		(20)		146		102
DTE Vantage	73		47		115		102
Energy Trading	(52)		(28)		(173)		5
Corporate and Other	(275)		(25)		(381)		(40)
Discontinued Operations	(33)		104		106		249
Net Income Attributable to DTE Energy Company	$	25	$	476	$	601	$	1,093

57

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following combined discussion is separately filed by DTE Energy and DTE Electric. However, DTE Electric does not make any representations as to information related solely to DTE Energy or the subsidiaries of DTE Energy other than itself.

EXECUTIVE OVERVIEW

DTE Energy is a diversified energy company and is the parent company of DTE Electric and DTE Gas, regulated electric and natural gas utilities engaged primarily in the business of providing electricity and natural gas sales, distribution, and storage services throughout Michigan. DTE Energy also operates two energy-related non-utility segments with operations throughout the United States.

On July 1, 2021, DTE Energy completed the separation of its natural gas pipeline, storage and gathering non-utility business. Effective with the separation, DTE retains no ownership in the new company, DT Midstream, which was formerly comprised of DTE Energy’s Gas Storage and Pipelines segment and certain DTE Energy holding company activity within the Corporate and Other segment. Gas Storage and Pipelines is no longer a reportable segment of DTE Energy, and financial results of DT Midstream are presented as discontinued operations in the Consolidated Financial Statements. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information regarding the separation of DT Midstream and discontinued operations.

Management’s Discussion and Analysis of Financial Condition and Results of Operations below reflect DTE Energy’s continuing operations, unless noted otherwise. The following table summarizes DTE Energy's financial results:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions, except per share amounts)
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Diluted Earnings per Common Share — continuing operations	$	0.30	$	1.92	$	2.55	$	4.37

The decrease in Net Income for both periods was primarily due to lower earnings in the Corporate and Other segment, driven primarily by the loss on debt extinguishment incurred in the third quarter 2021. The decrease in Net Income for the three months ended September 30, 2021 was also due to lower earnings in the DTE Electric and Energy Trading segments, partially offset by higher earnings in the DTE Vantage segment. For the nine months ended September 30, 2021, the decrease in Net Income was also due to lower earnings in the Energy Trading segment, partially offset by higher earnings in the Electric and Gas segments.

STRATEGY

DTE Energy's strategy is to achieve long-term earnings growth, a strong balance sheet, and an attractive dividend yield.

DTE Energy's utilities are investing capital to improve customer reliability through investments in base infrastructure and new generation, and to comply with environmental requirements. DTE Energy expects that planned significant capital investments will result in earnings growth. DTE Energy is focused on executing plans to achieve operational excellence and customer satisfaction with a focus on customer affordability. DTE Energy operates in a constructive regulatory environment and has solid relationships with its regulators.

DTE Energy is committed to reduce the carbon emissions of its electric utility operations by 32% by 2023, 50% by 2028, and 80% by 2040 from 2005 carbon emissions levels. DTE Energy is also committed to a net zero carbon emissions goal by 2050 for its electric utility and gas utility operations. To achieve the reduction goals in the near term, DTE Energy will transition away from coal-powered sources and incorporate more renewable energy, energy waste reduction projects, demand response, and natural gas fueled generation. DTE Energy has already begun the transition in the way it produces power through the continued retirement of its aging coal-fired plants. Refer to the "Capital Investments" section below for further discussion.

DTE Energy has significant investments in non-utility businesses and expects growth opportunities in its DTE Vantage segment. DTE Energy employs disciplined investment criteria when assessing growth opportunities that leverage its assets, skills, and expertise, and provides diversity in earnings and geography. Specifically, DTE Energy invests in targeted energy markets with attractive competitive dynamics where meaningful scale is in alignment with its risk profile.

58

A key priority for DTE Energy is to maintain a strong balance sheet which facilitates access to capital markets and reasonably priced short-term and long-term financing. Near-term growth will be funded through internally generated cash flows and the issuance of debt and equity. DTE Energy has an enterprise risk management program that, among other things, is designed to monitor and manage exposure to earnings and cash flow volatility related to commodity price changes, interest rates, and counterparty credit risk.

CAPITAL INVESTMENTS

DTE Energy's utility businesses require significant capital investments to maintain and improve the electric generation and electric and natural gas distribution infrastructure and to comply with environmental regulations and renewable energy requirements.

DTE Electric's capital investments over the 2021-2025 period are estimated at $14 billion, comprised of $5 billion for capital replacements and other projects, $7 billion for distribution infrastructure, and $2 billion for renewable generation. DTE Electric has retired six coal-fired generation units at the Trenton Channel, River Rouge, and St. Clair facilities and has announced plans to retire its remaining eleven coal-fired generating units, including five units at Trenton Channel and St. Clair in 2022. The two units at the Belle River facility will cease the use of coal by 2028 and will be evaluated for conversion to cleaner energy resources. The final four units at the Monroe facility are expected to be retired by 2040. Generation from the retired facilities will be replaced or offset with renewables, energy waste reduction, demand response, and natural gas fueled generation.

DTE Gas' capital investments over the 2021-2025 period are estimated at $3 billion, comprised of $1.4 billion for base infrastructure and $1.6 billion for gas main renewal, meter move out, and pipeline integrity programs.

DTE Electric and DTE Gas plan to seek regulatory approval for capital expenditures consistent with ratemaking treatment.

DTE Energy's non-utility businesses' capital investments are primarily for expansion, growth, and ongoing maintenance in the DTE Vantage segment, including approximately $1 billion to $1.4 billion from 2021-2025 for industrial energy services and renewable energy projects.

ENVIRONMENTAL MATTERS

The Registrants are subject to extensive environmental regulations. Additional costs may result as the effects of various substances on the environment are studied and governmental regulations are developed and implemented. Actual costs to comply could vary substantially. The Registrants expect to continue recovering environmental costs related to utility operations through rates charged to customers, as authorized by the MPSC.

Increased costs for energy produced from traditional coal-based sources due to recent, pending, and future regulatory initiatives could also increase the economic viability of energy produced from renewable, natural gas fueled generation, and/or nuclear sources, energy waste reduction initiatives, and the potential development of market-based trading of carbon instruments which could provide new business opportunities for DTE Energy's utility and non-utility segments. At the present time, it is not possible to quantify the financial impacts of these climate related regulatory initiatives on the Registrants or their customers.

For further discussion of environmental matters, see Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies."

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OUTLOOK

The next few years will be a period of rapid change for DTE Energy and for the energy industry. DTE Energy's strong utility base, combined with its integrated non-utility operations, position it well for long-term growth.

Looking forward, DTE Energy will focus on several areas that are expected to improve future performance:

•electric and gas customer satisfaction;

•electric distribution system reliability;

•new electric generation;

•gas distribution system renewal;

•rate competitiveness and affordability;

•regulatory stability and investment recovery for the electric and gas utilities;

•strategic investments in growth projects at DTE Vantage;

•employee safety and engagement;

•cost structure optimization across all business segments; and

•cash, capital, and liquidity to maintain or improve financial strength.

The separation of DT Midstream on July 1, 2021 will result in a reduction to DTE Energy's net income and cash flows in the near term. However, DTE Energy remains well-positioned for long-term growth and focused on the key objectives noted above. DTE Energy will continue to pursue opportunities to grow its businesses in a disciplined manner if it can secure opportunities that meet its strategic, financial, and risk criteria.

COVID-19 Pandemic

DTE Energy has been monitoring the COVID-19 pandemic and any related impacts to operating costs, customer demand, and the recoverability of assets in our business segments that could materially impact the Registrants' financial results.

As noted in Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies," the pandemic contributed to a shift in electric sales volumes from commercial and industrial customers to residential customers. DTE Energy expects this shift to continue in the near term as businesses maintain more remote operations. Other impacts from COVID-19 have related primarily to health and safety-related costs at the utilities and volumes at certain non-utility businesses, but these impacts have not been significant in 2021.

DTE Energy will continue to monitor these impacts as well as any regulatory and legislative activities related to COVID-19. The Registrants cannot predict the ultimate impact of these factors to our Consolidated Financial Statements as future developments involving COVID-19 and related impacts on economic and operating conditions are highly uncertain.

RESULTS OF OPERATIONS

Management’s Discussion and Analysis of Financial Condition and Results of Operations includes financial information prepared in accordance with GAAP, as well as the non-GAAP financial measures, Utility Margin and Non-utility Margin, discussed below, which DTE Energy uses as measures of its operational performance. Generally, a non-GAAP financial measure is a numerical measure of financial performance, financial position or cash flows that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP.

DTE Energy uses Utility Margin and Non-utility Margin, non-GAAP financial measures, to assess its performance by reportable segment.

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Utility Margin includes electric utility and gas utility Operating Revenues net of Fuel, purchased power, and gas expenses. The utilities’ fuel, purchased power, and natural gas supply are passed through to customers, and therefore, result in changes to the utilities’ revenues that are comparable to changes in such expenses. As such, DTE Energy believes Utility Margin provides a meaningful basis for evaluating the utilities’ operations across periods, as it excludes the revenue effect of fluctuations in these expenses. For the Electric segment, non-utility Operating Revenues are reported separately so that Utility Margin can be used to assess utility performance.

The Non-utility Margin relates to the DTE Vantage and Energy Trading segments. For the DTE Vantage segment, Non-utility Margin primarily includes Operating Revenues net of Fuel, purchased power, and gas expenses. Operating Revenues include sales of refined coal to third parties and the affiliated Electric utility, metallurgical coke and related by-products, petroleum coke, renewable natural gas and related credits, and electricity, as well as rental income and revenues from utility-type consulting, management, and operational services. For the Energy Trading segment, Non-utility Margin includes revenue and realized and unrealized gains and losses from physical and financial power and gas marketing, optimization, and trading activities, net of Purchased power and gas related to these activities. DTE Energy evaluates its operating performance of these non-utility businesses using the measure of Operating Revenues net of Fuel, purchased power, and gas expenses.

Utility Margin and Non-utility Margin are not measures calculated in accordance with GAAP and should be viewed as a supplement to and not a substitute for the results of operations presented in accordance with GAAP. Utility Margin and Non-utility Margin do not intend to represent operating income, the most comparable GAAP measure, as an indicator of operating performance and are not necessarily comparable to similarly titled measures reported by other companies.

The following sections provide a detailed discussion of the operating performance and future outlook of DTE Energy's segments. Segment information, described below, includes intercompany revenues and expenses, and other income and deductions that are eliminated in the Consolidated Financial Statements.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Income (Loss) Attributable to DTE Energy by Segment
Electric	$	342	$	398	$	788	$	675
Gas	(30)		(20)		146		102
DTE Vantage	73		47		115		102
Energy Trading	(52)		(28)		(173)		5
Corporate and Other	(275)		(25)		(381)		(40)
Discontinued Operations	(33)		104		106		249
Net Income Attributable to DTE Energy Company	$	25	$	476	$	601	$	1,093

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ELECTRIC

The Results of Operations discussion for DTE Electric is presented in a reduced disclosure format in accordance with General Instruction H(2) of Form 10-Q.

The Electric segment consists principally of DTE Electric. Electric results and outlook are discussed below:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Utility operations	$	1,700	$	1,690	$	4,468	$	4,211
Fuel and purchased power — utility	462		449		1,178		1,083
Utility Margin	1,238		1,241		3,290		3,128
Operating Revenues — Non-utility operations	2		3		9		10
Operation and maintenance	408		358		1,116		1,063
Depreciation and amortization	281		262		820		779
Taxes other than income	82		79		245		220
Asset (gains) losses and impairments, net	—		—		—		41
Operating Income	469		545		1,118		1,035
Other (Income) and Deductions	82		89		238		264
Income Tax Expense	45		58		92		96
Net Income Attributable to DTE Energy Company	$	342	$	398	$	788	$	675

See DTE Electric's Consolidated Statements of Operations for a complete view of its results. Differences between the Electric segment and DTE Electric's Consolidated Statements of Operations are primarily due to non-utility operations at DTE Sustainable Generation and the classification of certain benefit costs. Refer to Note 14 to the Consolidated Financial Statements, "Retirement Benefits and Trusteed Assets" for additional information.

Utility Margin decreased $3 million in the three months ended September 30, 2021 and increased $162 million in the nine months ended September 30, 2021. Revenues associated with certain mechanisms and surcharges are offset by related expenses elsewhere in the Registrants' Consolidated Statements of Operations.

The following table details changes in various Utility Margin components relative to the comparable prior period:

	Three Months		Nine Months
	(In millions)
Implementation of new rates	$	—	$	71
Regulatory mechanism — RPS	22		43
Regulatory mechanism — EWR	10		34
Base sales / rate mix	(3)		25
Weather	(40)		(19)
Other regulatory mechanisms and other	8		8
Increase (decrease) in Utility Margin	$	(3)	$	162

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	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
	(In thousands of MWh)
DTE Electric Sales
Residential	4,998	5,154	12,705	12,646
Commercial	4,625	4,507	12,532	11,936
Industrial	2,214	2,321	6,431	6,205
Other	49	49	155	157
	11,886	12,031	31,823	30,944
Interconnection sales(a)	1,008	295	2,812	823
Total DTE Electric Sales	12,894	12,326	34,635	31,767
DTE Electric Deliveries
Retail and wholesale	11,886	12,031	31,823	30,944
Electric retail access, including self-generators(b)	1,232	1,030	3,260	2,865
Total DTE Electric Sales and Deliveries	13,118	13,061	35,083	33,809

______________________________

(a)Represents power that is not distributed by DTE Electric.

(b)Represents deliveries for self-generators that have purchased power from alternative energy suppliers to supplement their power requirements.

Operation and maintenance expense increased $50 million and $53 million in the three and nine months ended September 30, 2021, respectively. The increase in the third quarter was primarily due to higher distribution operations expense of $41 million (primarily due to higher storm costs), higher legal and environmental expense of $10 million, higher EWR expense of $9 million, and higher corporate support costs of $6 million, partially offset by lower uncollectible expense of $6 million, 2020 COVID-19 related expenses of $5 million, and lower benefits expense of $5 million. The increase in the nine-month period was primarily due to higher distribution operations expense of $36 million (primarily due to higher storm costs), higher EWR expense of $30 million, higher benefits expense of $19 million, higher legal and environmental expense of $13 million, and higher corporate support costs of $11 million, partially offset by 2020 COVID-19 related expenses of $34 million, lower uncollectible expense of $16 million, and lower plant generation expense of $10 million.

Depreciation and amortization expense increased $19 million and $41 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was primarily due to a higher depreciable base.

Taxes other than income increased $3 million and $25 million in the three and nine months ended September 30, 2021, respectively. The increase in the third quarter was primarily due to higher property taxes of $3 million. The increase in the nine-month period was primarily due to higher property taxes of $24 million, which resulted primarily from a favorable property tax settlement in 2020.

Asset (gains) losses and impairments, net decreased $41 million in the nine months ended September 30, 2021. The decrease was primarily due to a 2020 write-off of capital expenditures related to incentive compensation, which were disallowed in the May 8, 2020 rate order from the MPSC.

Other (Income) and Deductions decreased $7 million and $26 million in the three and nine months ended September 30, 2021, respectively. The decrease in the third quarter was primarily due to $10 million of contributions to not-for-profit organizations in 2020, partially offset by a change in rabbi trust investment earnings (loss of $1 million in 2021 compared to a gain of $2 million in 2020). The decrease in the nine-month period was primarily due to $10 million of contributions to not-for-profit organizations in 2020, a change in rabbi trust investment earnings (gain of $3 million in 2021 compared to a loss of $7 million in 2020), and lower non-operating retirement benefits expense of $5 million.

Income Tax Expense decreased $13 million and $4 million in the three and nine months ended September 30, 2021, respectively. The decrease in the third quarter was primarily due to lower earnings and higher production tax credits. The decrease in the nine-month period was primarily due to higher production tax credits and higher amortization of the TCJA regulatory liability, partially offset by higher earnings.

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Outlook — DTE Electric will continue to move forward in its efforts to achieve operational excellence, sustain strong cash flows, and earn its authorized return on equity. DTE Electric expects that planned significant capital investments will result in earnings growth. DTE Electric will maintain a strong focus on customers by increasing reliability and satisfaction while keeping customer rate increases affordable. Looking forward, additional factors may impact earnings such as weather, the outcome of regulatory proceedings, benefit plan design changes, investment returns and changes in discount rate assumptions in benefit plans and health care costs, uncertainty of legislative or regulatory actions regarding climate change, and effects of energy waste reduction programs.

On March 26, 2021, DTE Electric filed an application requesting a financing order approving the securitization of $184 million of qualified costs related to the net book value of the River Rouge generation plant and tree trimming surge program costs. The filing requested collection of these qualifying costs from DTE Electric's customers. A final MPSC order was issued on June 23, 2021 authorizing DTE Electric to proceed with the issuance of securitization bonds for qualified costs of up to $236 million, increased for the inclusion of deferred taxes. The order authorized customer charges for the timely recovery of the amount securitized and other ongoing qualified costs. Securitization is expected in the first quarter 2022.

On August 31, 2021, DTE Electric filed an accounting application with the MPSC requesting approval of a one-time voluntary refund of $70 million collected in 2021 associated with the unexpected customer usage patterns due to the COVID-19 pandemic. This refund would be administered by investing in additional tree trimming without seeking future cost recovery. Such efforts would serve to improve customer reliability without impacting rates, thus providing an affordability benefit to customers. These investments would be incremental to the Tree Trim Surge expenses previously authorized by the MPSC.

DTE Electric anticipates receiving an order by the end of 2021. If approved by the end of the year, a regulatory liability will be recognized at that time. The regulatory liability would be reduced as the additional tree trim expenses are incurred during the remainder of 2021 through 2023. If the full $70 million is not spent by the end of 2023, DTE Electric would provide refunds to customers via bill credits for any shortage.

GAS

The Gas segment consists principally of DTE Gas. Gas results and outlook are discussed below:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Utility operations	$	193	$	173	$	1,070	$	964
Cost of gas — utility	23		12		263		232
Utility Margin	170		161		807		732
Operation and maintenance	123		119		380		360
Depreciation and amortization	44		37		130		112
Taxes other than income	20		18		71		62
Asset (gains) losses and impairments, net	1		—		1		14
Operating Income (Loss)	(18)		(13)		225		184
Other (Income) and Deductions	18		18		54		56
Income Tax Expense (Benefit)	(6)		(11)		25		26
Net Income (Loss) Attributable to DTE Energy Company	$	(30)	$	(20)	$	146	$	102

Utility Margin increased $9 million and $75 million in the three and nine months ended September 30, 2021, respectively. Revenues associated with certain mechanisms and surcharges are offset by related expenses elsewhere in DTE Energy's Consolidated Statements of Operations.

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The following table details changes in various Utility Margin components relative to the comparable prior period:

	Three Months		Nine Months
	(In millions)
Implementation of new rates	$	11	$	74
Home protection program	2		5
Regulatory mechanism — EWR	(1)		5
Weather	(2)		3
Infrastructure recovery mechanism	(5)		(18)
Other regulatory mechanisms and other	4		6
Increase in Utility Margin	$	9	$	75

	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
	(In Bcf)
Gas Markets
Gas sales	7	7	88	85
End-user transportation	34	40	123	135
	41	47	211	220
Intermediate transportation	102	110	370	349
Total Gas sales	143	157	581	569

Operation and maintenance expense increased $4 million and $20 million in the three and nine months ended September 30, 2021, respectively. The increase in the third quarter was primarily due to higher gas operations expense of $14 million, partially offset by lower uncollectible expense of $4 million and lower benefits expense of $4 million. The increase in the nine-month period was primarily due to higher gas operations expense of $30 million and higher EWR expense of $4 million, partially offset by lower uncollectible expense of $11 million.

Depreciation and amortization expense increased $7 million and $18 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was primarily due to a higher depreciable base and a change in depreciation rates effective October 2020.

Taxes other than income expense increased $2 million and $9 million in the three and nine months ended September 30, 2021, respectively. The increase in the third quarter was primarily due to higher property taxes. The increase in the nine-month period was primarily due to higher property taxes of $5 million and employee retention credits of $3 million recognized in 2020 pursuant to the CARES Act.

Asset (gains) losses and impairments, net increased $1 million in the three months ended September 30, 2021 and decreased $13 million in the nine months ended September 30, 2021. The decrease in the nine-month period was primarily due to a 2020 write-off of capital expenditures related to incentive compensation, which were disallowed in the July 17, 2020 rate case settlement.

Income Tax Expense (Benefit) decreased $5 million and $1 million in the three and nine months ended September 30, 2021, respectively. The decrease in the third quarter was primarily due to higher amortization of the TCJA regulatory liability. The decrease in the nine-month period was primarily due to higher amortization of the TCJA regulatory liability, partially offset by higher earnings.

Outlook — DTE Gas will continue to move forward in its efforts to achieve operational excellence, sustain strong cash flows, and earn its authorized return on equity. DTE Gas expects that planned significant infrastructure capital investments will result in earnings growth. Looking forward, additional factors may impact earnings such as weather, the outcome of regulatory proceedings, benefit plan design changes, and investment returns and changes in discount rate assumptions in benefit plans and health care costs. DTE Gas expects to continue its efforts to improve productivity and decrease costs while improving customer satisfaction with consideration of customer rate affordability.

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DTE Gas filed a rate case with the MPSC on February 12, 2021 requesting an increase in base rates of $195 million based on a projected twelve-month period ending December 31, 2022. The requested increase in base rates is primarily due to an increase in net plant resulting from infrastructure investments and operating and maintenance expenses. The rate filing also requested an increase in return on equity from 9.9% to 10.25% and includes projected changes in sales and working capital. A final MPSC order in this case is expected by December 2021.

DTE VANTAGE

The DTE Vantage segment is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial, and institutional customers, produce reduced emissions fuel, and sell electricity and pipeline-quality gas from renewable energy projects. DTE Vantage results and outlook are discussed below:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Non-utility operations	$	372	$	324	$	1,132	$	850
Fuel, purchased power, and gas — non-utility	267		246		851		624
Non-utility Margin	105		78		281		226
Operation and maintenance	77		71		226		206
Depreciation and amortization	18		18		55		53
Taxes other than income	2		2		8		8
Asset (gains) losses and impairments, net	1		(2)		28		(12)
Operating Income (Loss)	7		(11)		(36)		(29)
Other (Income) and Deductions	(61)		(47)		(108)		(100)
Income Taxes
Expense	18		10		22		21
Production Tax Credits	(20)		(19)		(56)		(47)
	(2)		(9)		(34)		(26)
Net Income	70		45		106		97
Less: Net Loss Attributable to Noncontrolling Interests	(3)		(2)		(9)		(5)
Net Income Attributable to DTE Energy Company	$	73	$	47	$	115	$	102

Operating Revenues — Non-utility operations increased $48 million and $282 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was due to the following:

	Three Months		Nine Months
	(In millions)
Higher production offset by the sale of membership interests in the REF business	$	10	$	171
Higher demand offset by lower prices in the Steel business	40		81
New projects in the Renewables business	14		41
Higher volumes in the On-site business	2		12
Closed projects in the Renewables business	(1)		(6)
Site closure in the REF business	(17)		(17)
	$	48	$	282

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Non-utility Margin increased $27 million and $55 million in the three and nine months ended September 30, 2021, respectively. The following table details changes in Non-utility Margin relative to the comparable prior periods:

	Three Months		Nine Months
	(In millions)
New projects in the Renewables business	$	15	$	41
Higher demand offset by lower prices in the Steel business	13		17
Closed projects in the Renewables business	(1)		(5)
Other	—		2
	$	27	$	55

Operation and maintenance expense increased $6 million and $20 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was primarily due to higher production and new projects.

Asset (gains) losses and impairments, net changed by $3 million and $40 million in the three and nine months ended September 30, 2021, respectively. The change in the third quarter was primarily due to the divestiture of a project in the Renewables business in 2020. The change in the nine-month period was primarily due to an asset impairment of $27 million recorded in the Steel business for the anticipated closure of a pulverized coal facility. The change in the nine-month period was also due to $12 million of activity in 2020, including the write-off of environmental liabilities upon completing site remediation in the Steel business, the sale of assets in the On-site business, and the divestiture of a project in the Renewables business.

Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information regarding the $27 million asset impairment and consideration of any additional impacts to future periods.

Other (Income) and Deductions increased $14 million and $8 million in the three and nine months ended September 30, 2021, respectively. The increase in the third quarter was primarily due to higher production in the REF business. The increase in the nine-month period was primarily due to higher production in the REF business, partially offset by $11 million of profit recognized from the sale of membership interests in the REF business recorded in 2020.

Income Taxes — Production Tax Credits increased $1 million and $9 million in the three and nine months ended September 30, 2021, respectively. The increase in the third quarter was primarily due to higher production in the REF business. The increase in the nine-month period was primarily due to higher production partially offset by the sale of membership interests in the REF business.

Net Loss Attributable to Noncontrolling Interests increased $1 million and $4 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was primarily due to higher production in the REF business.

Outlook — DTE Vantage will continue to leverage its extensive energy-related operating experience and project management capability to develop additional energy and renewable natural gas projects to serve energy intensive industrial customers in addition to optimizing the REF facilities until the phase-out at the end of 2021. Beginning in 2022, DTE Vantage expects decreases in Other Income and Production Tax Credits that will cause a corresponding reduction to Net Income as REF facilities will cease operations. Over the long-term, DTE Vantage expects growth in industrial energy services projects and renewable energy projects will offset the decreases to Net Income caused by the REF phase-out.

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ENERGY TRADING

Energy Trading focuses on physical and financial power, natural gas and environmental marketing and trading, structured transactions, enhancement of returns from its asset portfolio, and optimization of contracted natural gas pipeline transportation and storage positions. Energy Trading also provides natural gas, power, environmental, and related services, which may include the management of associated storage and transportation contracts on the customers' behalf and the supply or purchase of environmental attributes to various customers. Energy Trading results and outlook are discussed below:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Non-utility operations	$	1,602	$	1,061	$	4,208	$	2,714
Purchased power and gas — non-utility	1,630		1,076		4,347		2,636
Non-utility Margin	(28)		(15)		(139)		78
Operation and maintenance	17		19		60		60
Depreciation and amortization	1		1		4		4
Taxes other than income	1		1		4		4
Operating Income (Loss)	(47)		(36)		(207)		10
Other (Income) and Deductions	22		1		23		3
Income Tax Expense (Benefit)	(17)		(9)		(57)		2
Net Income (Loss) Attributable to DTE Energy Company	$	(52)	$	(28)	$	(173)	$	5

Operating Revenues — Non-utility operations increased $541 million and $1,494 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was primarily due to an increase in gas prices in the gas structured and gas transportation strategies.

Non-utility Margin decreased $13 million and $217 million in the three and nine months ended September 30, 2021, respectively. The following tables detail changes in Non-utility margin relative to the comparable prior periods:

	Three Months
	(In millions)
Unrealized Margins(a)
Favorable results, primarily in gas transportation, environmental trading, and power full requirements strategies	$	87
Unfavorable results, primarily in gas structured and gas storage strategies(b)	(127)
	(40)
Realized Margins(a)
Favorable results, primarily in gas structured, gas transportation, and power trading strategies(c)	72
Unfavorable results, primarily in environmental trading and power full requirements strategies	(45)
	27
Decrease in Non-utility Margin	$	(13)

_______________________________________

(a)Natural gas structured transactions typically involve a physical purchase or sale of natural gas in the future and/or natural gas basis financial instruments which are derivatives and a related non-derivative pipeline transportation contract. These gas structured transactions can result in significant earnings volatility as the derivative components are marked-to-market without revaluing the related non-derivative contracts.

(b)Amount includes $82 million of timing related losses related to gas strategies which will reverse in future periods as the underlying contracts settle.

(c)Amount includes $54 million of timing related losses related to gas strategies recognized in previous periods that reversed as the underlying contracts settled.

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	Nine Months
	(In millions)
Unrealized Margins(a)
Favorable results, primarily in the power full requirements strategy	$	25
Unfavorable results, primarily in gas structured, environmental trading, and gas storage strategies(b)	(297)
	(272)
Realized Margins(a)
Favorable results, primarily in gas structured, gas trading, and environmental trading strategies(c)	132
Unfavorable results, primarily in power ERCOT trading and power full requirements strategies	(77)
	55
Decrease in Non-utility Margin	$	(217)

_______________________________________

(a)Natural gas structured transactions typically involve a physical purchase or sale of natural gas in the future and/or natural gas basis financial instruments which are derivatives and a related non-derivative pipeline transportation contract. These gas structured transactions can result in significant earnings volatility as the derivative components are marked-to-market without revaluing the related non-derivative contracts.

(b)Amount includes $278 million of timing related losses related to gas strategies which will reverse in future periods as the underlying contracts settle.

(c)Amount includes $16 million of timing related losses related to gas strategies recognized in previous periods that reversed as the underlying contracts settled.

Other (Income) and Deductions increased $21 million and $20 million in the three and nine months ended September 30, 2021, respectively. The increase in both periods was primarily due to contributions to not-for-profit organizations including the DTE Energy Foundation.

Outlook — In the near-term, Energy Trading expects market conditions to remain challenging. The profitability of this segment may be impacted by the volatility in commodity prices and the uncertainty of impacts associated with regulatory changes, and changes in operating rules of Regional Transmission Organizations. Significant portions of the Energy Trading portfolio are economically hedged. Most financial instruments, physical power and natural gas contracts, and certain environmental contracts are deemed derivatives; whereas, natural gas and environmental inventory, contracts for pipeline transportation, storage assets, and some environmental contracts are not derivatives. As a result, Energy Trading will experience earnings volatility as derivatives are marked-to-market without revaluing the underlying non-derivative contracts and assets. Energy Trading's strategy is to economically manage the price risk of these underlying non-derivative contracts and assets with futures, forwards, swaps, and options. This results in gains and losses that are recognized in different interim and annual accounting periods.

See also the "Fair Value" section herein and Notes 8 and 9 to the Consolidated Financial Statements, "Fair Value" and "Financial and Other Derivative Instruments," respectively.

CORPORATE AND OTHER

Corporate and Other includes various holding company activities, holds certain non-utility debt, and holds certain investments, including funds supporting regional development and economic growth. The net loss of $275 million and $381 million for the three and nine months ended September 30, 2021, respectively, represents an increase of $250 million and $341 million from the net loss of $25 million and $40 million in the comparable 2020 periods.

The increase in both periods was primarily due to the loss on extinguishment of debt incurred in 2021, which reduced earnings by $286 million and $292 million for the three and nine months ended September 30, 2021, respectively. The increase in both periods was also driven by effective income tax rate adjustments, higher net interest expense, and a valuation allowance established in the third quarter 2021 for certain charitable contribution carryforwards. For the nine-month period, the higher loss was also due to the carryback of 2018 net operating losses to 2013 pursuant to the CARES Act, which resulted in a $34 million reduction to Income Tax Expense in 2020. The losses in both periods were partially offset by the remeasurement of state deferred taxes following the separation of DT Midstream, which resulted in a $85 million reduction to Income Tax Expense in the third quarter 2021.

For additional information regarding the loss on extinguishment of debt, refer to Note 10 to the Consolidated Financial Statements, "Long-term Debt." For additional information regarding the remeasurement of state deferred taxes and valuation allowance, refer to the Income Taxes section of Note 2 to the Consolidated Financial Statements, "Significant Accounting Policies."

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CAPITAL RESOURCES AND LIQUIDITY

Cash Requirements

DTE Energy uses cash to maintain and invest in the electric and natural gas utilities, to grow the non-utility businesses, to retire and pay interest on long-term debt, and to pay dividends. DTE Energy believes it will have sufficient internal and external capital resources to fund anticipated capital and operating requirements. DTE Energy expects that cash from operations in 2021 will be approximately $2.7 billion. DTE Energy anticipates base level utility capital investments, including environmental, renewable, and energy waste reduction expenditures; expenditures for non-utility businesses; and contributions to equity method investees in 2021 of approximately $3.9 billion. DTE Energy plans to seek regulatory approval to include utility capital expenditures in regulatory rate base consistent with prior treatment. Capital spending for growth of existing or new non-utility businesses will depend on the existence of opportunities that meet strict risk-return and value creation criteria.

Refer to the "Capital Investments" section above for additional information on DTE Energy's capital strategy and estimated spend over the next five years. Any capital commitments are also included in the disclosure of Purchase Commitments within Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies."

	Nine Months Ended September 30,
	2021		2020
	(in millions)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	$	516	$	93
Net cash from operating activities	2,372		2,781
Net cash used for investing activities	(2,780)		(3,093)
Net cash from (used for) financing activities	(52)		1,181
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	(460)		869
Cash, Cash Equivalents, and Restricted Cash at End of Period	$	56	$	962

Refer below for analysis of cash flows relating to operating, investing, and financing activities, which reflect DTE Energy's change in financial condition. Any significant non-cash items are included in the Supplemental disclosure of non-cash investing and financing activities within the the Consolidated Statements of Cash Flows.

Cash from Operating Activities

A majority of DTE Energy's operating cash flows are provided by the electric and natural gas utilities, which are significantly influenced by factors such as weather, electric retail access, regulatory deferrals, regulatory outcomes, economic conditions, changes in working capital, and operating costs.

Net cash from operations decreased by $409 million in 2021. The decrease was primarily due to a decrease in Deferred income taxes and Net Income, adjusted for the Loss on extinguishment of debt to reconcile Net Income to Net cash from operating activities. The decrease was partially offset by an increase from working capital items and Depreciation and amortization.

The change in working capital items in 2021 was primarily due to an increase in cash related to Accounts payable, Regulatory assets and liabilities, and Derivative assets and liabilities, partially offset by a decrease in cash related to Accounts receivable, net, Inventories, and Other current and noncurrent assets and liabilities.

Cash used for Investing Activities

Cash inflows associated with investing activities are primarily generated from the sale of assets, while cash outflows are the result of plant and equipment expenditures and acquisitions. In any given year, DTE Energy looks to realize cash from under-performing or non-strategic assets or matured, fully valued assets.

Capital spending within the utility businesses is primarily to maintain and improve electric generation and the electric and natural gas distribution infrastructure, and to comply with environmental regulations and renewable energy requirements.

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Capital spending within the non-utility businesses is primarily for ongoing maintenance, expansion, and growth. DTE Energy looks to make growth investments that meet strict criteria in terms of strategy, management skills, risks, and returns. All new investments are analyzed for their rates of return and cash payback on a risk adjusted basis. DTE Energy has been disciplined in how it deploys capital and will not make investments unless they meet the criteria. For new business lines, DTE Energy initially invests based on research and analysis. DTE Energy starts with a limited investment, evaluates the results, and either expands or exits the business based on those results. In any given year, the amount of growth capital will be determined by the underlying cash flows of DTE Energy, with a clear understanding of any potential impact on its credit ratings.

Net cash used for investing activities decreased by $313 million in 2021 primarily due to a decrease in non-utility plant and equipment expenditures and a decrease in Acquisitions related to business combinations, net of cash acquired, partially offset by an increase in utility plant and equipment expenditures.

Cash from (used for) Financing Activities

DTE Energy relies on both short-term borrowing and long-term financing as a source of funding for capital requirements not satisfied by its operations.

DTE Energy's strategy is to have a targeted debt portfolio blend of fixed and variable interest rates and maturity. DTE Energy targets balance sheet financial metrics to ensure it is consistent with the objective of a strong investment grade debt rating.

Net cash from financing activities decreased by $1.2 billion in 2021 primarily due to an increase in Redemption of long-term debt, Prepayment costs for redemption of long-term debt, Repurchase of common stock, and Dividends paid on common stock, partially offset by increases in Issuance of long-term debt and Short-term borrowings, net. The change is also due to the Acquisition related deferred payment during the nine months ended September 30, 2020.

Outlook

DTE Energy expects cash flows from operations to increase over the long-term, primarily as a result of growth from the utility and non-utility businesses. Growth in the utilities is expected to be driven primarily by capital spending which will increase the base from which rates are determined. Non-utility growth is expected from additional investments in the DTE Vantage segment. DTE Vantage cash flows are expected to temporarily decrease beginning in 2022 as REF facilities will have ceased operations. Growth from new industrial energy services projects and renewable energy investments are expected to offset these decreases over the long-term.

DTE Energy's separation of DT Midstream will also reduce operating cash flows in the near term. However, DTE Energy still expects higher cash flows from operations over the long-term due to the growth of its utilities and other non-utility operations.

DTE Energy may be impacted by the timing of collection or refund of various recovery and tracking mechanisms, as a result of timing of MPSC orders. Energy prices are likely to be a source of volatility with regard to working capital requirements for the foreseeable future. DTE Energy continues its efforts to identify opportunities to improve cash flows through working capital initiatives and maintaining flexibility in the timing and extent of long-term capital projects.

In July and August 2021, DTE Energy optionally redeemed $2.6 billion of long-term debt and incurred prepayment costs of $361 million. These redemptions were made using proceeds from DT Midstream's repayment of intercompany borrowings and one-time special dividend and will reduce interest expense in future periods. Refer to Notes 4 and 10 to the Consolidated Financial Statements, "Dispositions and Impairments" and "Long-term Debt," respectively, for additional information.

DTE Energy has $324 million in long-term debt, including finance leases, maturing within twelve months. Repayment of the debt is expected to be made through internally generated funds or the issuance of new long-term debt.

DTE Energy has approximately $2.1 billion of available liquidity at September 30, 2021, consisting primarily of cash and cash equivalents and amounts available under unsecured revolving credit agreements.

DTE Energy does not expect any equity issuances for 2021. Any contributions to the qualified pension plans are expected to be made in cash and DTE Energy does not anticipate making any contributions to its other postretirement benefit plans in 2021.

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To finance the acquisition of midstream natural gas assets in December 2019, DTE Energy issued equity units that will result in the issuance of common stock in November 2022. This transaction is not expected to impact DTE Energy's cash flows. Cash flow impacts in 2021-2022 will relate primarily to the payment of the remaining stock purchase liability associated with the equity units, which remain with DTE Energy after the separation of DT Midstream. Over the long-term, DTE Energy does not have any other equity commitments and will continue to evaluate equity needs on an annual basis in consideration of economic and financial market conditions.

DTE Energy has paid quarterly cash dividends for more than 100 consecutive years and expects to continue paying regular cash dividends in the future, including approximately $0.8 billion in 2021. Any payment of future dividends is subject to approval by the Board of Directors and may depend on DTE Energy's future earnings, capital requirements, and financial condition. Over the long-term, DTE Energy expects continued dividend growth and is targeting a payout ratio consistent with pure-play utility companies.

Various subsidiaries and equity investees of DTE Energy have entered into contracts which contain ratings triggers and are guaranteed by DTE Energy. These contracts contain provisions which allow the counterparties to require that DTE Energy post cash or letters of credit as collateral in the event that DTE Energy's credit rating is downgraded below investment grade. Certain of these provisions (known as "hard triggers") state specific circumstances under which DTE Energy can be required to post collateral upon the occurrence of a credit downgrade, while other provisions (known as "soft triggers") are not as specific. For contracts with soft triggers, it is difficult to estimate the amount of collateral which may be requested by counterparties and/or which DTE Energy may ultimately be required to post. The amount of such collateral which could be requested fluctuates based on commodity prices (primarily natural gas, power, environmental, and coal) and the provisions and maturities of the underlying transactions. As of September 30, 2021, DTE Energy's contractual obligation to post collateral in the form of cash or letters of credit in the event of a downgrade to below investment grade, under both hard trigger and soft trigger provisions, was $575 million.

The separation of DT Midstream has resulted in a shift in DTE Energy's strategy to a predominately pure-play utility, but to date has not had any impact on DTE Energy's credit ratings. Since the announcement of the planned separation in October 2020 and completed separation in July 2021, Standard and Poor's Global Ratings, Fitch Ratings, and Moody's Investor Service have all affirmed the ratings and stable outlook of DTE Energy, DTE Electric, and DTE Gas.

DTE Energy believes it will have sufficient operating flexibility, cash resources, and funding sources to maintain adequate amounts of liquidity and to meet future operating cash and capital expenditure needs. However, virtually all of DTE Energy's businesses are capital intensive, or require access to capital, and the inability to access adequate capital could adversely impact earnings and cash flows.

See Notes 6, 10, 11, 13, and 14 to the Consolidated Financial Statements, "Regulatory Matters," "Long-Term Debt," "Short-Term Credit Arrangements and Borrowings," "Commitments and Contingencies," and "Retirement Benefits and Trusteed Assets," respectively.

NEW ACCOUNTING PRONOUNCEMENTS

See Note 3 to the Consolidated Financial Statements, "New Accounting Pronouncements."

FAIR VALUE

Derivatives are generally recorded at fair value and shown as Derivative assets or liabilities. Contracts DTE Energy typically classifies as derivative instruments include power, natural gas, some environmental contracts, and certain forwards, futures, options and swaps, and foreign currency exchange contracts. Items DTE Energy does not generally account for as derivatives include natural gas and environmental inventory, pipeline transportation contracts, storage assets, and some environmental contracts. See Notes 8 and 9 to the Consolidated Financial Statements, "Fair Value" and "Financial and Other Derivative Instruments," respectively.

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The tables below do not include the expected earnings impact of non-derivative natural gas storage, transportation, certain power contracts, and some environmental contracts which are subject to accrual accounting. Consequently, gains and losses from these positions may not match with the related physical and financial hedging instruments in some reporting periods, resulting in volatility in the Registrants' reported period-by-period earnings; however, the financial impact of the timing differences will reverse at the time of physical delivery and/or settlement.

The Registrants manage their MTM risk on a portfolio basis based upon the delivery period of their contracts and the individual components of the risks within each contract. Accordingly, the Registrants record and manage the energy purchase and sale obligations under their contracts in separate components based on the commodity (e.g. electricity or natural gas), the product (e.g. electricity for delivery during peak or off-peak hours), the delivery location (e.g. by region), the risk profile (e.g. forward or option), and the delivery period (e.g. by month and year).

The Registrants have established a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). For further discussion of the fair value hierarchy, see Note 8 to the Consolidated Financial Statements, "Fair Value."

The following table provides details on changes in DTE Energy's MTM net asset (or liability) position:

	DTE Energy
	(In millions)
MTM at December 31, 2020	$	28
Reclassified to realized upon settlement	16
Changes in fair value recorded to income	(281)
Amounts recorded to unrealized income	(265)
Changes in fair value recorded in regulatory liabilities	14
Change in collateral	(58)
MTM at September 30, 2021	$	(281)

The table below shows the maturity of DTE Energy's MTM positions. The positions from 2024 and beyond principally represent longer tenor gas structured transactions:

Source of Fair Value	2021		2022		2023		2024 and Beyond		Total Fair Value
	(In millions)
Level 1	$	21	$	86	$	35	$	12	$	154
Level 2	31		11		(22)		(28)		(8)
Level 3	(74)		(155)		(37)		(97)		(363)
MTM before collateral adjustments	$	(22)	$	(58)	$	(24)	$	(113)	(217)
Collateral adjustments									(64)
MTM at September 30, 2021									$	(281)

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

Market Price Risk

The Electric and Gas businesses have commodity price risk, primarily related to the purchases of coal, natural gas, uranium, and electricity. However, the Registrants do not bear significant exposure to earnings risk, as such changes are included in the PSCR and GCR regulatory rate-recovery mechanisms. In addition, changes in the price of natural gas can impact the valuation of lost and stolen gas, storage sales, and transportation services revenue at the Gas segment. The Gas segment manages its market price risk related to storage sales revenue primarily through the sale of long-term storage contracts. The Registrants are exposed to short-term cash flow or liquidity risk as a result of the time differential between actual cash settlements and regulatory rate recovery.

The DTE Vantage segment is subject to electricity, natural gas, and coal product price risk. DTE Energy manages its exposure to commodity price risk through the use of long-term contracts.

DTE Energy's Energy Trading business segment has exposure to electricity, natural gas, environmental, crude oil, heating oil, and foreign currency exchange price fluctuations. These risks are managed by the energy marketing and trading operations through the use of forward energy, capacity, storage, options, and futures contracts, within predetermined risk parameters.

Credit Risk

Allowance for Doubtful Accounts

The Registrants regularly review contingent matters, existing and future economic conditions, customer trends and other factors relating to customers and their contracts and record provisions for amounts considered at risk of probable loss in the allowance for doubtful accounts. The Registrants believe their accrued amounts are adequate for probable loss.

Trading Activities

DTE Energy is exposed to credit risk through trading activities. Credit risk is the potential loss that may result if the trading counterparties fail to meet their contractual obligations. DTE Energy utilizes both external and internal credit assessments when determining the credit quality of trading counterparties.

The following table displays the credit quality of DTE Energy's trading counterparties as of September 30, 2021:

	Credit Exposure Before Cash Collateral		Cash Collateral		Net Credit Exposure
	(In millions)
Investment Grade(a)
A- and Greater	$	295	$	—	$	295
BBB+ and BBB	156		—		156
BBB-	18		—		18
Total Investment Grade	469		—		469
Non-investment grade(b)	2		—		2
Internally Rated — investment grade(c)	927		(72)		855
Internally Rated — non-investment grade(d)	56		(6)		50
Total	$	1,454	$	(78)	$	1,376

_______________________________________

(a)This category includes counterparties with minimum credit ratings of Baa3 assigned by Moody’s Investors Service (Moody’s) or BBB-assigned by Standard & Poor’s Rating Group, a division of McGraw-Hill Companies, Inc. (Standard & Poor’s). The five largest counterparty exposures, combined, for this category represented 11% of the total gross credit exposure.

(b)This category includes counterparties with credit ratings that are below investment grade. The five largest counterparty exposures, combined, for this category represented less than 1% of the total gross credit exposure.

(c)This category includes counterparties that have not been rated by Moody’s or Standard & Poor’s but are considered investment grade based on DTE Energy’s evaluation of the counterparty’s creditworthiness. The five largest counterparty exposures, combined, for this category represented 23% of the total gross credit exposure.

(d)This category includes counterparties that have not been rated by Moody’s or Standard & Poor’s and are considered non-investment grade based on DTE Energy’s evaluation of the counterparty’s creditworthiness. The five largest counterparty exposures, combined, for this category represented 2% of the total gross credit exposure.

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Other

The Registrants engage in business with customers that are non-investment grade. The Registrants closely monitor the credit ratings of these customers and, when deemed necessary and permitted under the tariffs, request collateral or guarantees from such customers to secure their obligations.

Interest Rate Risk

DTE Energy is subject to interest rate risk in connection with the issuance of debt. In order to manage interest costs, DTE Energy may use treasury locks and interest rate swap agreements. DTE Energy's exposure to interest rate risk arises primarily from changes in U.S. Treasury rates, commercial paper rates, and LIBOR. As of September 30, 2021, DTE Energy had floating rate debt of $361 million and a floating rate debt-to-total debt ratio of 2.05%.

Foreign Currency Exchange Risk

DTE Energy has foreign currency exchange risk arising from market price fluctuations associated with fixed priced contracts. These contracts are denominated in Canadian dollars and are primarily for the purchase and sale of natural gas and power, as well as for long-term transportation capacity. To limit DTE Energy's exposure to foreign currency exchange fluctuations, DTE Energy has entered into a series of foreign currency exchange forward contracts through June 2030.

Summary of Sensitivity Analyses

Sensitivity analyses were performed on the fair values of commodity contracts for DTE Energy and long-term debt obligations for the Registrants. The commodity contracts listed below principally relate to energy marketing and trading activities. The sensitivity analyses involved increasing and decreasing forward prices and rates at September 30, 2021 and 2020 by a hypothetical 10% and calculating the resulting change in the fair values. The hypothetical losses related to long-term debt would be realized only if DTE Energy transferred all of its fixed-rate long-term debt to other creditors.

The results of the sensitivity analyses:

	Assuming a 10% Increase in Prices/Rates				Assuming a 10% Decrease in Prices/Rates
	As of September 30,				As of September 30,
Activity	2021		2020		2021		2020		Change in the Fair Value of
	(In millions)
Environmental contracts	$	(16)	$	(3)	$	15	$	6	Commodity contracts
Gas contracts	$	102	$	21	$	(102)	$	(20)	Commodity contracts
Power contracts	$	13	$	6	$	(13)	$	(6)	Commodity contracts
Interest rate risk — DTE Energy	$	(649)	$	(659)	$	674	$	681	Long-term debt
Interest rate risk — DTE Electric	$	(329)	$	(298)	$	348	$	315	Long-term debt

For further discussion of market risk, see Note 9 to the Consolidated Financial Statements, "Financial and Other Derivative Instruments."

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Item 4. Controls and Procedures

DTE Energy

(a) Evaluation of disclosure controls and procedures

Management of DTE Energy carried out an evaluation, under the supervision and with the participation of DTE Energy's Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of the design and operation of DTE Energy's disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) as of September 30, 2021, which is the end of the period covered by this report. Based on this evaluation, DTE Energy's CEO and CFO have concluded that such disclosure controls and procedures are effective in providing reasonable assurance that information required to be disclosed by DTE Energy in reports that it files or submits under the Exchange Act (i) is recorded, processed, summarized, and reported within the time periods specified in the U.S. Securities and Exchange Commission's rules and forms and (ii) is accumulated and communicated to DTE Energy's management, including its CEO and CFO, as appropriate to allow timely decisions regarding required disclosure. Due to the inherent limitations in the effectiveness of any disclosure controls and procedures, management cannot provide absolute assurance that the objectives of its disclosure controls and procedures will be attained.

(b) Changes in internal control over financial reporting

There have been no changes in DTE Energy's internal control over financial reporting during the quarter ended September 30, 2021 that have materially affected, or are reasonably likely to materially affect, DTE Energy's internal control over financial reporting.

DTE Electric

(a) Evaluation of disclosure controls and procedures

Management of DTE Electric carried out an evaluation, under the supervision and with the participation of DTE Electric's Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of the design and operation of DTE Electric's disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) as of September 30, 2021, which is the end of the period covered by this report. Based on this evaluation, DTE Electric's CEO and CFO have concluded that such disclosure controls and procedures are effective in providing reasonable assurance that information required to be disclosed by DTE Electric in reports that it files or submits under the Exchange Act (i) is recorded, processed, summarized, and reported within the time periods specified in the U.S. Securities and Exchange Commission's rules and forms and (ii) is accumulated and communicated to DTE Electric's management, including its CEO and CFO, as appropriate to allow timely decisions regarding required disclosure. Due to the inherent limitations in the effectiveness of any disclosure controls and procedures, management cannot provide absolute assurance that the objectives of its disclosure controls and procedures will be attained.

(b) Changes in internal control over financial reporting

There have been no changes in DTE Electric's internal control over financial reporting during the quarter ended September 30, 2021 that have materially affected, or are reasonably likely to materially affect, DTE Electric's internal control over financial reporting.

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Part II — Other Information

Item 1. Legal Proceedings

For information on legal proceedings and matters related to the Registrants, see Notes 6 and 13 to the Consolidated Financial Statements, "Regulatory Matters" and "Commitments and Contingencies," respectively.

For environmental proceedings in which the government is a party, the Registrants have included disclosures if any sanctions of $1 million or greater are expected.

Item 1A. Risk Factors

There are various risks associated with the operations of the Registrants' businesses. To provide a framework to understand the operating environment of the Registrants, a brief explanation of the more significant risks associated with the Registrants' businesses is provided in Part 1, Item 1A. Risk Factors in DTE Energy's and DTE Electric's combined 2020 Annual Report on Form 10-K. Although the Registrants have tried to identify and discuss key risk factors, others could emerge in the future.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Purchases of DTE Energy Equity Securities by the Issuer and Affiliated Purchasers

The following table provides information about DTE Energy's purchases of equity securities that are registered by DTE Energy pursuant to Section 12 of the Exchange Act of 1934 for the quarter ended September 30, 2021:

	Number of Shares Purchased(a)	Average Price Paid per Share(a)		Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Average Price Paid per Share	Maximum Dollar Value that May Yet Be Purchased Under the Plans or Programs
07/01/21 - 07/31/21	23,900	$	114.70	—	—	—
08/01/21 - 08/30/21	100,832	$	118.06	—	—	—
09/01/21 - 09/30/21	4,421	$	104.46	—	—	—
Total	129,153			—

_______________________________________

(a)Represents shares of DTE Energy common stock withheld to satisfy income tax obligations upon the vesting of restricted stock based on the price in effect at the grant date.

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Item 6. Exhibits

Exhibit Number	Description	DTE Energy	DTE Electric
	(i) Exhibits filed herewith:
31.201	Chief Executive Officer Section 302 Form 10-Q Certification of Periodic Report	X
31.202	Chief Financial Officer Section 302 Form 10-Q Certification of Periodic Report	X
31.203	Chief Executive Officer Section 302 Form 10-Q Certification of Periodic Report		X
31.204	Chief Financial Officer Section 302 Form 10-Q Certification of Periodic Report		X
101.INS	XBRL Instance Document - The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.	X	X
101.SCH	XBRL Taxonomy Extension Schema	X	X
101.CAL	XBRL Taxonomy Extension Calculation Linkbase	X	X
101.DEF	XBRL Taxonomy Extension Definition Database	X	X
101.LAB	XBRL Taxonomy Extension Label Linkbase	X	X
101.PRE	XBRL Taxonomy Extension Presentation Linkbase	X	X
	(ii) Exhibits furnished herewith:
32.201	Chief Executive Officer Section 906 Form 10-Q Certification of Periodic Report	X
32.202	Chief Financial Officer Section 906 Form 10-Q Certification of Periodic Report	X
32.203	Chief Executive Officer Section 906 Form 10-Q Certification of Periodic Report		X
32.204	Chief Financial Officer Section 906 Form 10-Q Certification of Periodic Report		X

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Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorized. The signature for each undersigned Registrant shall be deemed to relate only to matters having reference to such Registrant and any subsidiaries thereof.

Date:	October 27, 2021
			DTE ENERGY COMPANY
		By:	/S/ TRACY J. MYRICK
			Tracy J. Myrick Chief Accounting Officer
			(Duly Authorized Officer)
			DTE ELECTRIC COMPANY
		By:	/S/ TRACY J. MYRICK
			Tracy J. Myrick Chief Accounting Officer
			(Duly Authorized Officer)

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EX-31.201

Exhibit 31.201

FORM 10-Q CERTIFICATION

I, Gerardo Norcia, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of DTE Energy Company;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/S/ GERARDO NORCIA	Date:	October 27, 2021
Gerardo Norcia President and Chief Executive Officer of DTE Energy Company

EX-31.202

Exhibit 31.202

FORM 10-Q CERTIFICATION

I, David Ruud, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of DTE Energy Company;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/S/ DAVID RUUD	Date:	October 27, 2021
David Ruud Senior Vice President and Chief Financial Officer of DTE Energy Company

EX-31.203

Exhibit 31.203

FORM 10-Q CERTIFICATION

I, Gerardo Norcia, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of DTE Electric Company;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/S/ GERARDO NORCIA	Date:	October 27, 2021
Gerardo Norcia President and Chief Executive Officer of DTE Electric Company

EX-31.204

Exhibit 31.204

FORM 10-Q CERTIFICATION

I, David Ruud, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of DTE Electric Company;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/S/ DAVID RUUD	Date:	October 27, 2021
David Ruud Senior Vice President and Chief Financial Officer of DTE Electric Company

EX-32.201

Exhibit 32.201

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of DTE Energy Company (the “Company”) for the quarter ended September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gerardo Norcia, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge and belief:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	October 27, 2021	/S/ GERARDO NORCIA
		Gerardo Norcia President and Chief Executive Officer of DTE Energy Company

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.202

Exhibit 32.202

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of DTE Energy Company (the “Company”) for the quarter ended September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David Ruud, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge and belief:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	October 27, 2021	/S/ DAVID RUUD
		David Ruud Senior Vice President and Chief Financial Officer of DTE Energy Company

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.203

Exhibit 32.203

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of DTE Electric Company (the “Company”) for the quarter ended September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gerardo Norcia, certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge and belief:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	October 27, 2021	/S/ GERARDO NORCIA
		Gerardo Norcia President and Chief Executive Officer of DTE Electric Company

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.204

Exhibit 32.204

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of DTE Electric Company (the “Company”) for the quarter ended September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David Ruud, certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge and belief:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	October 27, 2021	/S/ DAVID RUUD
		David Ruud Senior Vice President and Chief Financial Officer of DTE Electric Company

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information	9 Months Ended
	Sep. 30, 2021 shares
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	1-11607
Entity Registrant Name	DTE Energy Co
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	38-3217752
Entity Address, Address Line One	One Energy Plaza
Entity Address, City or Town	Detroit
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48226-1279
City Area Code	313
Local Phone Number	235-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	193,727,278
Entity Central Index Key	0000936340
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
DTE Electric
Entity File Number	1-2198
Entity Registrant Name	DTE Electric Co
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	38-0478650
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	138,632,324
Entity Central Index Key	0000028385
Common stock, without par value
Title of 12(b) Security	Common stock, without par value
Trading Symbol	DTE
Security Exchange Name	NYSE
2016 Series F 6.00% Junior Subordinated Debentures due 2076
Title of 12(b) Security	2016 Series F 6.00% Junior Subordinated Debentures due 2076
Trading Symbol	DTY
Security Exchange Name	NYSE
2017 Series E 5.25% Junior Subordinated Debentures due 2077
Title of 12(b) Security	2017 Series E 5.25% Junior Subordinated Debentures due 2077
Trading Symbol	DTW
Security Exchange Name	NYSE
2019 6.25% Corporate Units
Title of 12(b) Security	2019 6.25% Corporate Units
Trading Symbol	DTP
Security Exchange Name	NYSE
2020 Series G 4.375% Junior Subordinated Debentures due 2080
Title of 12(b) Security	2020 Series G 4.375% Junior Subordinated Debentures due 2080
Trading Symbol	DTB
Security Exchange Name	NYSE

XML

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenues
Utility operations	$ 1,875	$ 1,844	$ 5,483	$ 5,119
Non-utility operations	1,840	1,236	4,834	3,224
Operating Revenues	3,715	3,080	10,317	8,343
Operating Expenses
Fuel, purchased power, and gas — utility	477	455	1,411	1,296
Fuel, purchased power, gas, and other — non-utility	1,766	1,174	4,708	2,923
Operation and maintenance	615	556	1,750	1,651
Depreciation and amortization	344	318	1,010	949
Taxes other than income	106	100	329	294
Asset (gains) losses and impairments, net	2	(2)	29	43
Operating Expenses	3,310	2,601	9,237	7,156
Operating Income	405	479	1,080	1,187
Other (Income) and Deductions
Interest expense	156	149	477	450
Interest income	(6)	(11)	(16)	(25)
Non-operating retirement benefits, net	3	5	10	20
Loss on extinguishment of debt	376	0	384	0
Other income	(90)	(75)	(187)	(188)
Other expenses	30	20	50	72
Other (Income) and Deductions	469	88	718	329
Income (Loss) Before Income Taxes	(64)	391	362	858
Income Tax Expense (Benefit) (Note 2)	(119)	21	(124)	19
Net Income from Continuing Operations	55	370	486	839
Income (Loss) from Discontinued Operations, Net of Taxes (Note 4)	(33)	107	112	257
Net Income	22	477	598	1,096
Less: Net Income (Loss) Attributable to Noncontrolling Interests
Continuing operations	(3)	(2)	(9)	(5)
Discontinued operations	0	3	6	8
Net Income Attributable to DTE Energy Company/DTE Electric Company	$ 25	$ 476	$ 601	$ 1,093
Basic Earnings per Common Share
Continuing operations (in dollars per share)	$ 0.30	$ 1.93	$ 2.55	$ 4.37
Discontinued operations (in dollars per share)	(0.17)	0.54	0.55	1.30
Basic Earnings per Common Share (in dollars per share)	0.13	2.47	3.10	5.67
Diluted Earnings per Common Share
Continuing operations (in dollars per share)	0.30	1.92	2.55	4.37
Discontinued operations (in dollars per share)	(0.17)	0.54	0.55	1.29
Diluted Earnings per Common Share (in dollars per share)	$ 0.13	$ 2.46	$ 3.10	$ 5.66
Weighted Average Common Shares Outstanding
Basic (in shares)	193	193	193	192
Diluted (in shares)	194	193	194	193
DTE Electric
Operating Revenues
Utility operations	$ 1,700	$ 1,690	$ 4,468	$ 4,211
Operating Expenses
Fuel, purchased power, and gas — utility	462	451	1,185	1,090
Operation and maintenance	410	361	1,122	1,074
Depreciation and amortization	278	258	810	768
Taxes other than income	83	79	245	220
Asset (gains) losses and impairments, net	0	0	0	41
Operating Expenses	1,233	1,149	3,362	3,193
Operating Income	467	541	1,106	1,018
Other (Income) and Deductions
Interest expense	84	83	251	249
Interest income	0	0	0	(2)
Non-operating retirement benefits, net	0	0	(1)	0
Other income	(14)	(18)	(52)	(68)
Other expenses	8	18	26	66
Other (Income) and Deductions	78	83	224	245
Income (Loss) Before Income Taxes	389	458	882	773
Income Tax Expense (Benefit) (Note 2)	45	58	92	96
Less: Net Income (Loss) Attributable to Noncontrolling Interests
Net Income Attributable to DTE Energy Company/DTE Electric Company	$ 344	$ 400	$ 790	$ 677

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Income	$ 22	$ 477	$ 598	$ 1,096
Net Income	25	476	601	1,093
Other comprehensive income, net of tax:
Benefit obligations, net of taxes of $1, $1, $2, and $3, respectively	2	2	5	7
Net unrealized gains (losses) on derivatives, net of taxes of $1, $—, $2, and $1, respectively	4	1	6	3
Other comprehensive income	6	3	11	10
Comprehensive income	28	480	609	1,106
Less: Comprehensive income (loss) attributable to noncontrolling interests	(3)	1	(3)	3
Comprehensive Income (Loss) Attributable to DTE Energy Company/DTE Electric Company	31	479	612	1,103
DTE Electric
Net Income	344	400	790	677
Other comprehensive income, net of tax:
Other comprehensive income	0	0	0	0
Comprehensive Income (Loss) Attributable to DTE Energy Company/DTE Electric Company	$ 344	$ 400	$ 790	$ 677

XML

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Tax effect on benefit obligations	$ 1	$ 1	$ 2	$ 3
Tax effect on net unrealized gains (losses) on derivatives during the period	$ 1	$ 0	$ 2	$ 1

XML

Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 54	$ 472
Restricted cash	2	2
Accounts receivable (less allowance for doubtful accounts)
Customer	1,522	1,542
Other	170	127
Inventories
Fuel and gas	398	335
Materials, supplies, and other	517	373
Derivative assets	347	116
Regulatory assets	187	129
Other	297	185
Current assets of discontinued operations	0	217
Total Current Assets	3,494	3,498
Investments
Nuclear decommissioning trust funds	2,007	1,855
Investments in equity method investees	186	177
Other	187	196
Total Investments	2,380	2,228
Property
Property, plant, and equipment	36,134	34,016
Accumulated depreciation and amortization	(9,977)	(9,517)
Property, plant, and equipment, net	26,157	24,499
Other Assets
Goodwill	1,993	1,993
Regulatory assets	3,974	4,125
Intangible assets	181	199
Notes receivable	304	261
Derivative assets	81	40
Prepaid postretirement costs	620	561
Operating lease right-of-use assets	100	107
Other	151	126
Noncurrent assets of discontinued operations	0	7,859
Total Other Assets	7,404	15,271
Total Assets	39,435	45,496
Accounts payable
Accounts payable	1,365	1,000
Accrued interest	147	158
Dividends payable	160	210
Short-term borrowings	361	38
Current portion long-term debt, including finance leases	324	469
Derivative liabilities	465	68
Regulatory liabilities	41	39
Short-term borrowings
Operating lease liabilities	14	16
Other	556	594
Current liabilities of discontinued operations	0	99
Total Current Liabilities	3,433	2,691
Long-Term Debt (net of current portion)
Mortgage bonds, notes, and other	16,022	17,802
Junior subordinated debentures	883	1,175
Finance lease liabilities	19	24
Total Long-Term Debt (net of current portion)	16,924	19,001
Other Liabilities
Deferred income taxes	2,105	2,069
Regulatory liabilities	3,220	3,363
Asset retirement obligations	2,974	2,829
Unamortized investment tax credit	158	162
Derivative liabilities	244	60
Accrued pension liability	732	797
Accrued postretirement liability	398	407
Nuclear decommissioning	310	283
Operating lease liabilities	77	83
Other	281	326
Noncurrent liabilities of discontinued operations	0	836
Total Other Liabilities	10,499	11,215
Commitments and Contingencies (Notes 6 and 13)
Equity
Common stock	5,366	5,406
Retained earnings	3,317	7,156
Accumulated other comprehensive loss	(116)	(137)
Total DTE Energy/DTE Electric Company Equity	8,567	12,425
Total Equity	8,579	12,589
Total Liabilities and Equity	39,435	45,496
Continuing Operations
Equity
Noncontrolling interests	12	10
Discontinued Operations
Equity
Noncontrolling interests	0	154
DTE Electric
Current Assets
Cash and cash equivalents	18	16
Accounts receivable (less allowance for doubtful accounts)
Customer	782	763
Affiliates	17	13
Other	64	62
Inventories
Fuel and gas	175	187
Materials, supplies, and other	320	292
Regulatory assets	178	123
Prepaid property tax	126	52
Other	43	19
Total Current Assets	1,723	1,527
Investments
Nuclear decommissioning trust funds	2,007	1,855
Other	41	42
Total Investments	2,048	1,897
Property
Property, plant, and equipment	28,014	26,171
Accumulated depreciation and amortization	(7,506)	(7,050)
Property, plant, and equipment, net	20,508	19,121
Other Assets
Regulatory assets	3,335	3,440
Intangible assets	3	11
Prepaid postretirement costs — affiliates	371	335
Operating lease right-of-use assets	67	75
Other	120	107
Total Other Assets	3,896	3,968
Total Assets	28,175	26,513
Accounts payable
Affiliates	64	62
Other	582	410
Accrued interest	87	91
Current portion long-term debt, including finance leases	322	468
Regulatory liabilities	36	18
Short-term borrowings
Affiliates	32	101
Other	159	0
Operating lease liabilities	11	11
Other	165	219
Total Current Liabilities	1,458	1,380
Long-Term Debt (net of current portion)
Mortgage bonds, notes, and other	8,590	7,774
Finance lease liabilities	9	13
Total Long-Term Debt (net of current portion)	8,599	7,787
Other Liabilities
Deferred income taxes	2,677	2,525
Regulatory liabilities	2,322	2,432
Asset retirement obligations	2,744	2,607
Unamortized investment tax credit	158	162
Nuclear decommissioning	310	283
Accrued pension liability — affiliates	697	731
Accrued postretirement liability — affiliates	378	384
Operating lease liabilities	49	56
Other	91	96
Total Other Liabilities	9,426	9,276
Commitments and Contingencies (Notes 6 and 13)
Equity
Common stock	5,720	5,447
Retained earnings	2,972	2,623
Total DTE Energy/DTE Electric Company Equity	8,692	8,070
Total Liabilities and Equity	$ 28,175	$ 26,513

XML

Consolidated Statements of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Allowance for doubtful accounts	$ 102	$ 104
Shareholder’s Equity
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	193,727,278	193,770,617
Common stock, shares outstanding (in shares)	193,727,278	193,770,617
DTE Electric
Current Assets
Allowance for doubtful accounts	$ 55	$ 57
Shareholder’s Equity
Par value (in dollars per share)	$ 10	$ 10
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	138,632,324	138,632,324
Common stock, shares outstanding (in shares)	138,632,324	138,632,324

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net Income	$ 598	$ 1,096
Net Income	601	1,093
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	1,092	1,059
Nuclear fuel amortization	44	22
Allowance for equity funds used during construction	(20)	(19)
Deferred income taxes	(36)	350
Equity earnings of equity method investees	(90)	(96)
Dividends from equity method investees	78	122
Loss on extinguishment of debt	384	0
Asset (gains) losses and impairments, net	46	44
Changes in assets and liabilities:
Accounts receivable, net	(8)	343
Inventories	(209)	(54)
Prepaid postretirement benefit costs	(59)	(56)
Accounts payable	225	(80)
Accrued pension liability	(65)	(126)
Accrued postretirement liability	(9)	0
Derivative assets and liabilities	309	15
Regulatory assets and liabilities	270	(30)
Other current and noncurrent assets and liabilities	(178)	191
Net cash from operating activities	2,372	2,781
Investing Activities
Plant and equipment expenditures — utility	(2,591)	(2,362)
Plant and equipment expenditures — non-utility	(109)	(526)
Acquisitions related to business combinations, net of cash acquired	0	(126)
Proceeds from sale of assets	2	7
Proceeds from sale of nuclear decommissioning trust fund assets	854	2,054
Investment in nuclear decommissioning trust funds	(853)	(2,051)
Distributions from equity method investees	11	6
Contributions to equity method investees	(7)	(32)
Notes receivable	(65)	(58)
Other	(22)	(5)
Net cash used for investing activities	(2,780)	(3,093)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	4,033	2,724
Redemption of long-term debt	(3,242)	(682)
Short-term borrowings, net	323	160
Repurchase of common stock	(66)	0
Dividends paid on common stock	(631)	(574)
Contributions from noncontrolling interests, principally REF entities	35	25
Distributions to noncontrolling interests	(33)	(27)
Acquisition related deferred payment, excluding accretion	0	(380)
Prepayment costs for extinguishment of long-term debt	(361)	0
Transfer of cash to DT Midstream at separation	(37)	0
Other	(73)	(65)
Net cash from (used for) financing activities	(52)	1,181
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	(460)	869
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	516	93
Cash, Cash Equivalents, and Restricted Cash at End of Period	56	962
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	386	282
Separation of DT Midstream net assets, excluding cash transferred	3,962	0
DTE Electric
Operating Activities
Net Income	790	677
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	810	768
Nuclear fuel amortization	44	22
Allowance for equity funds used during construction	(18)	(18)
Deferred income taxes	90	74
Asset (gains) losses and impairments, net	0	41
Changes in assets and liabilities:
Accounts receivable, net	(25)	(71)
Inventories	(19)	(30)
Accounts payable	40	37
Prepaid postretirement benefit costs — affiliates	(36)	0
Accrued pension liability — affiliates	(34)	(80)
Accrued postretirement liability — affiliates	(6)	(35)
Regulatory assets and liabilities	229	(79)
Other current and noncurrent assets and liabilities	(259)	(20)
Net cash from operating activities	1,606	1,286
Investing Activities
Plant and equipment expenditures	(2,152)	(1,981)
Proceeds from sale of nuclear decommissioning trust fund assets	854	2,054
Investment in nuclear decommissioning trust funds	(853)	(2,051)
Notes Receivable and Other	(22)	(14)
Net cash used for investing activities	(2,173)	(1,992)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	986	1,683
Redemption of long-term debt	(321)	(632)
Capital contribution by parent company	273	400
Short-term borrowings, net — affiliate	(69)	7
Short-term borrowings, net — other	159	(154)
Dividends paid on common stock	(441)	(404)
Other	(18)	(17)
Net cash from (used for) financing activities	569	883
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	2	177
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	16	12
Cash, Cash Equivalents, and Restricted Cash at End of Period	18	189
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	$ 307	$ 141

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Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	DTE Electric	DTE Electric Common Stock	DTE Electric Additional Paid-in Capital	DTE Electric Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2019		192,209,000					138,632,000
Beginning Balance at Dec. 31, 2019	$ 11,836	$ 5,233	$ 6,587	$ (148)	$ 164
Beginning Balance at Dec. 31, 2019						$ 7,195	$ 1,386	$ 3,425	$ 2,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	342		340		2
Net Income						94			94
Dividends declared on common stock	(195)		(195)			(135)			(135)
Other comprehensive income , net of tax	3			3
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other (in shares)		403,000
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other	2	$ 2
Ending Balance (in shares) at Mar. 31, 2020		192,612,000					138,632,000
Ending Balance at Mar. 31, 2020	11,988	$ 5,235	6,732	(145)	166
Ending Balance at Mar. 31, 2020						7,154	$ 1,386	3,425	2,343
Beginning Balance (in shares) at Dec. 31, 2019		192,209,000					138,632,000
Beginning Balance at Dec. 31, 2019	11,836	$ 5,233	6,587	(148)	164
Beginning Balance at Dec. 31, 2019						7,195	$ 1,386	3,425	2,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	1,096
Net Income	1,093					677
Other comprehensive income , net of tax	10					0
Ending Balance (in shares) at Sep. 30, 2020		193,560,000					138,632,000
Ending Balance at Sep. 30, 2020	12,488	$ 5,369	7,092	(138)	165
Ending Balance at Sep. 30, 2020						7,868	$ 1,386	3,825	2,657
Beginning Balance (in shares) at Mar. 31, 2020		192,612,000					138,632,000
Beginning Balance at Mar. 31, 2020	11,988	$ 5,235	6,732	(145)	166
Beginning Balance at Mar. 31, 2020						7,154	$ 1,386	3,425	2,343
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	277		277		0
Net Income						183			183
Dividends declared on common stock	(390)		(390)			(134)			(134)
Other comprehensive income , net of tax	4			4
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other (in shares)		39,000
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other	13	$ 12	(1)		2
Ending Balance (in shares) at Jun. 30, 2020		192,651,000					138,632,000
Ending Balance at Jun. 30, 2020	11,892	$ 5,247	6,618	(141)	168
Ending Balance at Jun. 30, 2020						7,203	$ 1,386	3,425	2,392
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	477		476		1
Net Income	476					400			400
Dividends declared on common stock						(135)			(135)
Issuance of common stock (in shares)		98,000
Issuance of common stock	11	$ 11
Contribution of common stock to pension plan (in shares)		694,000
Contribution of common stock to pension plan	82	$ 82
Other comprehensive income , net of tax	3			3		0
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other (in shares)		117,000
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other	23	$ 29	(2)		(4)
Capital contribution by parent company						400		400
Ending Balance (in shares) at Sep. 30, 2020		193,560,000					138,632,000
Ending Balance at Sep. 30, 2020	$ 12,488	$ 5,369	7,092	(138)	165
Ending Balance at Sep. 30, 2020						$ 7,868	$ 1,386	3,825	2,657
Beginning Balance (in shares) at Dec. 31, 2020	193,770,617	193,771,000				138,632,324	138,632,000
Beginning Balance at Dec. 31, 2020	$ 12,589	$ 5,406	7,156	(137)	164
Beginning Balance at Dec. 31, 2020	12,425					$ 8,070	$ 1,386	4,061	2,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	397		397
Net Income						208			208
Dividends declared on common stock	(210)		(210)			(147)			(147)
Repurchase of common stock (in shares)		(430,000)
Repurchase of common stock	(54)	$ (54)
Other comprehensive income , net of tax	3			3
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other (in shares)		386,000
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other	(11)	$ (8)	(1)		(2)
Ending Balance (in shares) at Mar. 31, 2021		193,727,000					138,632,000
Ending Balance at Mar. 31, 2021	$ 12,714	$ 5,344	7,342	(134)	162
Ending Balance at Mar. 31, 2021						$ 8,131	$ 1,386	4,061	2,684
Beginning Balance (in shares) at Dec. 31, 2020	193,770,617	193,771,000				138,632,324	138,632,000
Beginning Balance at Dec. 31, 2020	$ 12,589	$ 5,406	7,156	(137)	164
Beginning Balance at Dec. 31, 2020	12,425					$ 8,070	$ 1,386	4,061	2,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	598
Net Income	601					790
Other comprehensive income , net of tax	$ 11					$ 0
Ending Balance (in shares) at Sep. 30, 2021	193,727,278	193,727,000				138,632,324	138,632,000
Ending Balance at Sep. 30, 2021	$ 8,579	$ 5,366	3,317	(116)	12
Ending Balance at Sep. 30, 2021	8,567					$ 8,692	$ 1,386	4,334	2,972
Beginning Balance (in shares) at Mar. 31, 2021		193,727,000					138,632,000
Beginning Balance at Mar. 31, 2021	12,714	$ 5,344	7,342	(134)	162
Beginning Balance at Mar. 31, 2021						8,131	$ 1,386	4,061	2,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	179		179
Net Income						238			238
Dividends declared on common stock	(370)		(370)			(146)			(146)
Other comprehensive income , net of tax	2			2
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other (in shares)		25,000
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other	14	$ 17	(2)		(1)
Ending Balance (in shares) at Jun. 30, 2021		193,752,000					138,632,000
Ending Balance at Jun. 30, 2021	12,539	$ 5,361	7,149	(132)	161
Ending Balance at Jun. 30, 2021						8,223	$ 1,386	4,061	2,776
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	22		25		(3)
Net Income	25					344			344
Dividends declared on common stock						(148)			(148)
Repurchase of common stock (in shares)		(99,000)
Repurchase of common stock	(12)	$ (12)
Other comprehensive income , net of tax	6			6		0
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other (in shares)		74,000
Stock-based compensation, net distributions/contributions to/from noncontrolling interests, and other	23	$ 17	1		5
Separation of DT Midstream	$ (3,999)		(3,858)	10	(151)
Capital contribution by parent company						$ 273		273
Ending Balance (in shares) at Sep. 30, 2021	193,727,278	193,727,000				138,632,324	138,632,000
Ending Balance at Sep. 30, 2021	$ 8,579	$ 5,366	$ 3,317	$ (116)	$ 12
Ending Balance at Sep. 30, 2021	$ 8,567					$ 8,692	$ 1,386	$ 4,334	$ 2,972

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Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 1.91	$ 1.09	$ 2.03	$ 1.01

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Organization and Basis of Presentation

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

ORGANIZATION AND BASIS OF PRESENTATION

Corporate Structure

DTE Energy owns the following businesses:

•DTE Electric is a public utility engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.3 million customers in southeastern Michigan;

•DTE Gas is a public utility engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million customers throughout Michigan and the sale of storage and transportation capacity; and

•Other businesses include (1) DTE Vantage, formerly DTE Energy's Power and Industrial Projects segment, which is primarily involved in providing industrial energy services, reduced emissions fuel projects, and renewable natural gas projects, and 2) energy marketing and trading operations.

DTE Electric and DTE Gas are regulated by the MPSC. Certain activities of DTE Electric and DTE Gas, as well as various other aspects of businesses under DTE Energy, are regulated by the FERC. In addition, the Registrants are regulated by other federal and state regulatory agencies including the NRC, the EPA, EGLE, and for DTE Energy, the CFTC and CARB.

Basis of Presentation

The Consolidated Financial Statements should be read in conjunction with the Combined Notes to Consolidated Financial Statements included in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.

The accompanying Consolidated Financial Statements of the Registrants are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Registrants' estimates.

The Consolidated Financial Statements are unaudited but, in the Registrants' opinions, include all adjustments necessary to present a fair statement of the results for the interim periods. All adjustments are of a normal recurring nature, except as otherwise disclosed in these Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2021.

The information in these combined notes relates to each of the Registrants as noted in the Index of Combined Notes to Consolidated Financial Statements. However, DTE Electric does not make any representation as to information related solely to DTE Energy or the subsidiaries of DTE Energy other than itself.

Certain prior year balances for DTE Electric were reclassified to match the current year's Consolidated Financial Statements presentation.

Separation of DT Midstream

On July 1, 2021, DTE Energy completed the previously announced separation of its natural gas pipeline, storage and gathering non-utility business. Effective with the separation, DTE retains no ownership in the new company, DT Midstream, which was formerly comprised of DTE Energy's Gas Storage and Pipelines segment and also included certain DTE Energy holding company activity within the Corporate and Other segment. Gas Storage and Pipelines is no longer a reportable segment of DTE Energy, and financial results of DT Midstream are presented as Income from discontinued operations, net of taxes on DTE Energy's Consolidated Statements of Operations. Assets and liabilities of DT Midstream are also presented as discontinued operations on DTE Energy's Consolidated Statements of Financial Position. Prior periods have been recast to reflect this presentation.

No adjustments were made to the historical activity within the Consolidated Statements of Comprehensive Income, Consolidated Statements of Cash Flows, or the Consolidated Statements of Changes in Equity. Unless noted otherwise, discussion in the Notes to the Consolidated Financial Statements relate to continuing operations. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information regarding the separation of DT Midstream and discontinued operations.

Principles of Consolidation

The Registrants consolidate all majority-owned subsidiaries and investments in entities in which they have controlling influence. Non-majority owned investments are accounted for using the equity method when the Registrants are able to significantly influence the operating policies of the investee. When the Registrants do not influence the operating policies of an investee, the equity investment is valued at cost minus any impairments, if applicable. These Consolidated Financial Statements also reflect the Registrants' proportionate interests in certain jointly-owned utility plants. The Registrants eliminate all intercompany balances and transactions.

The Registrants evaluate whether an entity is a VIE whenever reconsideration events occur. The Registrants consolidate VIEs for which they are the primary beneficiary. If a Registrant is not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, a Registrant considers all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. The Registrants perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

During the third quarter of 2021, the Registrants performed reassessments of certain VIEs owned by DT Midstream. Upon the separation of DT Midstream, DTE Energy no longer owns any interest in SGG, owner and operator of certain midstream natural gas assets. Therefore, SGG has been removed from the amounts for DTE Energy's consolidated VIEs in the table below. Additionally, as a result of the separation of DT Midstream, DTE Energy no longer has an equity interest in NEXUS, owner of a 256-mile pipeline which transports shale gas to Ohio, Michigan, and Ontario market centers. DTE Energy has removed its equity investment in NEXUS from the amounts for its non-consolidated VIEs. The Registrants maintain a variable interest in NEXUS relating to DTE Electric's transportation services contract. Assets, liabilities, and earnings related to SGG and NEXUS are included in discontinued operations in the Consolidated Financial Statements.

Legal entities within the DTE Vantage segment enter into long-term contractual arrangements with customers to supply energy-related products or services. The entities are generally designed to pass-through the commodity risk associated with these contracts to the customers, with DTE Energy retaining operational and customer default risk. These entities generally are VIEs and consolidated when DTE Energy is the primary beneficiary. In addition, DTE Energy has interests in certain VIEs through which control of all significant activities is shared with partners, and therefore are generally accounted for under the equity method.

The Registrants hold ownership interests in certain limited partnerships. The limited partnerships include investment funds which support regional development and economic growth, and an operational business providing energy-related products. These entities are generally VIEs as a result of certain characteristics of the limited partnership voting rights. The ownership interests are accounted for under the equity method as the Registrants are not the primary beneficiaries.

DTE Energy has variable interests in VIEs through certain of its long-term purchase and sale contracts. DTE Electric has variable interests in VIEs through certain of its long-term purchase contracts. As of September 30, 2021, the carrying amount of assets and liabilities in DTE Energy's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase and sale contracts are predominantly related to working capital accounts and generally represent the amounts owed by or to DTE Energy for the deliveries associated with the current billing cycle under the contracts. As of September 30, 2021, the carrying amount of assets and liabilities in DTE Electric's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase contracts are predominantly related to working capital accounts and generally represent the amounts owed by DTE Electric for the deliveries associated with the current billing cycle under the contracts. The Registrants have not provided any significant form of financial support associated with these long-term contracts. There is no material potential exposure to loss as a result of DTE Energy's variable interests through these long-term purchase and sale contracts. In addition, there is no material potential exposure to loss as a result of DTE Electric's variable interests through these long-term purchase contracts.

The maximum risk exposure for consolidated VIEs is reflected on the Registrants' Consolidated Statements of Financial Position and, for DTE Energy, in Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies," related to REF guarantees and indemnities. For non-consolidated VIEs, the maximum risk exposure of the Registrants is generally limited to their investment, notes receivable, future funding commitments, and amounts which DTE Energy has guaranteed.

The following table summarizes the major Consolidated Statements of Financial Position items for consolidated VIEs as of September 30, 2021 and December 31, 2020. All assets and liabilities of a consolidated VIE are presented where it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. VIEs, in which DTE Energy holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below.

Amounts for DTE Energy's consolidated VIEs are as follows:

	September 30, 2021		December 31, 2020
	(In millions)
ASSETS
Cash and cash equivalents	$	23	$	20
Accounts receivable	26		28
Inventories	45		107
Property, plant, and equipment, net	5		14
Notes receivable and other	67		33
	$	166	$	202
LIABILITIES
Accounts payable	$	21	$	22
Short-term borrowings	74		38
Other current and long-term liabilities	2		4
	$	97	$	64

Amounts for DTE Energy's non-consolidated VIEs are as follows:

	September 30, 2021		December 31, 2020
	(In millions)
Investments in equity method investees	$	170	$	159
Notes receivable	$	16	$	21
Future funding commitments	$	3	$	6

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Significant Accounting Policies

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Significant Accounting Policies

SIGNIFICANT ACCOUNTING POLICIES

Other Income

The following is a summary of DTE Energy's Other income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Income from REF entities	$	57	$	43	$	102	$	95
Equity earnings of equity method investees	17		12		31		21
Contract services	6		7		21		20
Allowance for equity funds used during construction	7		6		20		19
Gains from rabbi trust securities(a)	—		2		4		24
Other	3		5		9		9
	$	90	$	75	$	187	$	188

_______________________________________

(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.

The following is a summary of DTE Electric's Other income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Contract services	$	6	$	7	$	21	$	20
Allowance for equity funds used during construction	6		6		18		18
Gains from rabbi trust securities allocated from DTE Energy(a)	—		2		4		24
Other	2		3		9		6
	$	14	$	18	$	52	$	68

_______________________________________

(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.

Changes in Accumulated Other Comprehensive Income (Loss)

Comprehensive income (loss) is the change in common shareholders' equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DTE Energy include changes in benefit obligations, consisting of deferred actuarial losses and prior service costs, unrealized gains and losses from derivatives accounted for as cash flow hedges, and foreign currency translation adjustments. DTE Energy releases income tax effects from accumulated other comprehensive income when the circumstances upon which they are premised cease to exist.

Changes in Accumulated other comprehensive income (loss) are presented in DTE Energy's Consolidated Statements of Changes in Equity and DTE Electric's Consolidated Statements of Changes in Shareholder's Equity. For DTE Energy, this includes a one-time reduction of $10 million in Accumulated other comprehensive loss due to the Separation of DT Midstream in the third quarter 2021. For the three and nine months ended months ended September 30, 2021 and 2020, reclassifications out of Accumulated other comprehensive income (loss) were not material.

Income Taxes

The interim effective tax rates of the Registrants are as follows:

	Effective Tax Rate
	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
DTE Energy	186	%	5	%	(34)	%	2	%
DTE Electric	12	%	13	%	10	%	12	%

These tax rates are affected by estimated annual permanent items, including AFUDC equity, production tax credits, and other flow-through items, as well as discrete items that may occur in any given period, but are not consistent from period to period. DTE Energy's effective tax rates in 2021 have been significantly impacted by pre-tax losses in the third quarter, driven primarily by the loss on extinguishment of debt and reclassification of DT Midstream earnings to discontinued operations.

The 181% increase in DTE Energy's effective tax rate for the three months ended September 30, 2021 was primarily due to a deferred tax remeasurement of 133%, production tax credits of 51%, and amortization of the TCJA regulatory liability of 35%, partially offset by a valuation allowance of 29% and recognition of a deferred intercompany gain of 13%.

The 36% decrease in DTE Energy’s effective tax rate for the nine months ended September 30, 2021 was primarily due to a deferred tax remeasurement of 23%, production tax credits of 13%, and amortization of the TCJA regulatory liability of 9%, partially offset by the 2020 carryback of 2018 net operating losses due to the CARES Act of 4%, a valuation allowance of 4%, recognition of a deferred intercompany gain of 2%, and West Virginia tax law change of 2% in 2021.

The valuation allowance referenced above was established in the third quarter 2021 based on a change in DTE Energy's assessment of its ability to utilize certain charitable contribution carryforwards. The valuation allowance resulted in $18 million of deferred tax expense and was reflected in Income Tax Expense (Benefit) in the Consolidated Statements of Operations for the three and nine months ended September 30, 2021. For the deferred tax remeasurement and deferred intercompany gain noted above, refer to the "Separation of DT Midstream - Tax Impacts" section below for additional information.

The 1% decrease in DTE Electric's effective tax rate for the three months ended September 30, 2021 was primarily due to production tax credits. The 2% decrease in DTE Electric's effective tax rate for the nine months ended September 30, 2021 was primarily due to production tax credits of 1% and amortization of the TCJA regulatory liability of 1%.

DTE Electric had income tax receivables with DTE Energy of $11 million and $8 million at September 30, 2021 and December 31, 2020, respectively.

Separation of DT Midstream - Tax Impacts

On July 1, 2021, DTE Energy completed the separation of its natural gas pipeline, storage and gathering non-utility business, DT Midstream. Refer to Note 4 to the Consolidated Financial Statements, "Dispositions and Impairments" for additional information regarding the separation. The separation was a tax free distribution to shareholders, but triggered certain tax effects at DTE Energy including the remeasurement of state deferred tax assets and liabilities and the recognition of a deferred intercompany gain. The state remeasurement reduced deferred tax liabilities and generated a deferred tax benefit of $85 million. The recognition of the deferred intercompany gain resulted in $9 million of additional deferred tax expense. Both of these impacts were reflected in Income Tax Expense (Benefit) in the Consolidated Statements of Operations for the three and nine months ended September 30, 2021.

Unrecognized Compensation Costs

As of September 30, 2021, DTE Energy had $76 million of total unrecognized compensation cost related to non-vested stock incentive plan arrangements. That cost is expected to be recognized over a weighted-average period of 1.4 years.

Allocated Stock-Based Compensation

DTE Electric received an allocation of costs from DTE Energy associated with stock-based compensation of $10 million and $12 million for the three months ended September 30, 2021 and 2020, respectively, while such allocation was $35 million and $28 million for the nine months ended September 30, 2021 and 2020, respectively.

Cash, Cash Equivalents, and Restricted Cash

Cash and cash equivalents include cash on hand, cash in banks, and temporary investments purchased with remaining maturities of three months or less. Restricted cash consists of funds held in separate bank accounts to satisfy contractual obligations and guarantee performance. Restricted cash designated for payments within one year is classified as a Current Asset.

Financing Receivables

Financing receivables are primarily composed of trade receivables, notes receivable, and unbilled revenue. The Registrants' financing receivables are stated at net realizable value.

The Registrants monitor the credit quality of their financing receivables on a regular basis by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, ratings by credit agencies where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, the Registrants have determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have ranked the counterparty as investment grade. To the extent credit ratings are not available, the Registrants utilize other credit quality indicators to determine the level of risk associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have ranked the counterparty as below investment grade; however, due to favorable information on other credit quality indicators, the Registrants have determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status.

The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through September 30, 2021.

	DTE Energy								DTE Electric
	Year of Origination
	2021		2020		2019 and Prior		Total		2021 and Prior
	(In millions)
Notes receivable
Internal grade 1	$	—	$	—	$	19	$	19	$	14
Internal grade 2	2		100		21		123		3
Internal grade 3	—		—		—		—		—
Total notes receivable(a)	$	2	$	100	$	40	$	142	$	17
Net investment in leases
Net investment in leases, internal grade 1	$	—	$	2	$	39	$	41	$	—
Net investment in leases, internal grade 2	—		159		1		160		—
Total net investment in leases(a)	$	—	$	161	$	40	$	201	$	—

_______________________________________

(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other on the Consolidated Statements of Financial Position.

The allowance for doubtful accounts on accounts receivable for the utility entities is generally calculated using an aging approach that utilizes rates developed in reserve studies. DTE Electric and DTE Gas establish an allowance for uncollectible accounts based on historical losses and management's assessment of existing and future economic conditions, customer trends and other factors. Customer accounts are generally considered delinquent if the amount billed is not received by the due date, which is typically in 21 days, however, factors such as assistance programs may delay aggressive action. DTE Electric and DTE Gas generally assess late payment fees on trade receivables based on past-due terms with customers. Customer accounts are written off when collection efforts have been exhausted. The time period for write-off is 150 days after service has been terminated.

The customer allowance for doubtful accounts for non-utility businesses and other receivables for both utility and non-utility businesses is generally calculated based on specific review of probable future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based upon the specific circumstances of the associated receivable.

Notes receivable for DTE Energy are primarily comprised of finance lease receivables and loans that are included in Notes Receivable and Other current assets on DTE Energy's Consolidated Statements of Financial Position. Notes receivable for DTE Electric are primarily comprised of loans.

Notes receivable are typically considered delinquent when payment is not received for periods ranging from 60 to 120 days. The Registrants cease accruing interest (nonaccrual status), consider a note receivable impaired, and establish an allowance for credit loss when it is probable that all principal and interest amounts due will not be collected in accordance with the contractual terms of the note receivable. In determining the allowance for credit losses for notes receivable, the Registrants consider the historical payment experience and other factors that are expected to have a specific impact on the counterparty's ability to pay including existing and future economic conditions.

Cash payments received on nonaccrual status notes receivable, that do not bring the account contractually current, are first applied to the contractually owed past due interest, with any remainder applied to principal. Accrual of interest is generally resumed when the note receivable becomes contractually current.

The following tables present a roll-forward of the activity for the Registrants' financing receivables credit loss reserves:

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2021	$	101	$	3	$	104	$	57
Current period provision	41		1		42		27
Write-offs charged against allowance	(92)		(1)		(93)		(58)
Recoveries of amounts previously written off	49		—		49		29
Ending reserve balance, September 30, 2021	$	99	$	3	$	102	$	55

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2020(a)	$	79	$	4	$	83	$	46
Current period provision	102		3		105		61
Write-offs charged against allowance	(130)		(4)		(134)		(80)
Recoveries of amounts previously written off	50		—		50		30
Ending reserve balance, December 31, 2020	$	101	$	3	$	104	$	57

_______________________________________

(a)DTE Energy Trade accounts receivable beginning reserve balance excludes $8 million related to the discontinued operations of DT Midstream. Prospective activity includes only the continuing operations of DTE Energy.

Uncollectible expense for the Registrants is primarily comprised of the current period provision for allowance for doubtful accounts and is summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
DTE Energy	$	7	$	22	$	42	$	72
DTE Electric	10		16		26		42

There are no material amounts of past due financing receivables for the Registrants as of September 30, 2021.

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New Accounting Pronouncements

9 Months Ended

Sep. 30, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

New Accounting Pronouncements

NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Pronouncements

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.

In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity. The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.

Recently Issued Pronouncements

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting, as amended. The amendments in this update provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. The Registrants presently have various contracts that reference LIBOR and are assessing how this standard may be applied to specific contract modifications.

In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments. The amendments in this update modify lease classification requirements for lessors, providing that lease contracts with variable lease payments that do not depend on a reference index or a rate should be classified as operating leases if they would have been classified as a sales-type or direct financing lease and resulted in the recognition of a selling loss at lease commencement. The ASU is effective for the Registrants for fiscal years beginning after December 15, 2021, and interim periods therein. Early adoption is permitted. The Registrants are currently assessing the impact of this standard on their Consolidated Financial Statements.

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Dispositions and Impairments

9 Months Ended

Sep. 30, 2021

Discontinued Operations and Disposal Groups [Abstract]

Dispositions and Impairments

DISPOSITIONS AND IMPAIRMENTS

Separation of DT Midstream

On October 27, 2020, DTE Energy announced that its Board of Directors had authorized management to pursue a plan to spin-off its natural gas pipeline, storage and gathering non-utility business. On July 1, 2021, DTE Energy completed the separation of the new company, DT Midstream, through the distribution of 96,732,466 shares of DT Midstream common stock to DTE Energy shareholders. The distribution reflected 100% of the outstanding common stock of DT Midstream as of 5:00 p.m. ET on June 18, 2021 (the “record date”). DTE Energy shareholders received one share of DT Midstream common stock for every two shares of DTE Energy common stock held at the close of business on the record date, with certain shareholders receiving cash in lieu of fractional shares of DT Midstream common stock. For U.S. federal income tax purposes, DTE Energy’s U.S. shareholders generally should not recognize gain or loss as a result of the distribution of DT Midstream stock, except with respect to cash received in lieu of fractional shares.

In June 2021, in order to facilitate the separation and settle intercompany balances with DTE Energy, DT Midstream issued long-term debt in the form of $2.1 billion senior notes and a $1.0 billion term loan. Using the debt proceeds, net of discount and issuance costs of $53 million, DT Midstream made the following cash payments:

•Settled Short-term borrowings due to DTE Energy as of June 30, 2021 of $2,537 million

•Settled affiliate Accounts Receivable due from DTE Energy and affiliate Accounts payable due to DTE Energy as of June 30, 2021 for net cash paid to DTE Energy of $9 million

•Provided a one-time special dividend to DTE Energy of $501 million

These payments eliminated in consolidation and had no direct impact on DTE Energy’s Consolidated Financial Statements of Financial Position. During July and August 2021, DTE Energy used the proceeds received from DT Midstream to optionally redeem $2.6 billion of long-term debt. Refer to Note 10 to the Consolidated Financial Statements, “Long-term Debt,” for additional information.

Continuing Involvement

Following the separation on July 1, 2021, DT Midstream became an independent public company listed under the symbol “DTM” on the New York Stock Exchange (NYSE) and DTE Energy no longer retains any ownership in DT Midstream. In order to govern the ongoing relationships between DT Midstream and DTE Energy after the separation and to facilitate an orderly transition, the parties entered into a series of agreements including the following:

•Separation and Distribution Agreement – sets forth the principal actions to be taken in connection with the separation, including the transfer of assets and assumption of liabilities, among others, and sets forth other agreements governing aspects of the relationship between DTE Energy and DT Midstream

•Transition Services Agreement – allows for DTE Energy to provide DT Midstream with specified services for a limited time and no longer than 24 months following the separation, with related costs to be paid by DT Midstream. Services include support for gas operations, information technology, accounting, tax, legal, human resources, and various other administrative services

•Tax Matters Agreement – governs the respective rights, responsibilities and obligations of DTE Energy and DT Midstream after the separation with respect to all tax matters

•Employee Matters Agreement – addresses certain employment, compensation and benefits matters, including the allocation and treatment of certain assets and liabilities relating to DT Midstream employees

In addition, DTE Energy and its subsidiaries have various commercial agreements that will continue after the separation. These agreements include certain pipeline, gathering, and storage services and operating and maintenance agreements, and are not considered material to the Consolidated Financial Statements.

Discontinued Operations

The table below reflects the financial results of DT Midstream that have been reclassified from continuing operations and included in discontinued operations within the Consolidated Statements of Operations. These results include the impact of tax-related adjustments and all transaction costs related to the separation. General corporate overhead costs have been excluded and no portion of corporate interest costs were allocated to discontinued operations.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Non-utility operations	$	—	$	204	$	405	$	546
Operating Expenses
Cost of gas and other — non-utility	—		6		15		14
Operation and maintenance(a)	30		32		124		80
Depreciation and amortization	—		38		82		110
Taxes other than income	—		3		13		12
Asset (gains) losses and impairments, net	—		(4)		17		(4)
	30		75		251		212
Operating Income (Loss)	(30)		129		154		334
Other (Income) and Deductions
Interest expense	—		29		50		82
Interest income	—		(4)		(4)		(6)
Other income	—		(45)		(62)		(98)
	—		(20)		(16)		(22)
Income (Loss) from Discontinued Operations Before Income Taxes	(30)		149		170		356
Income Tax Expense	3		42		58		99
Income (Loss) from Discontinued Operations, Net of Taxes	(33)		107		112		257
Less: Net Income Attributable to Noncontrolling Interests	—		3		6		8
Net Income (Loss) from Discontinued Operations	$	(33)	$	104	$	106	$	249

_______________________________________

(a)Includes separation transaction costs of $30 million and $59 million for the three and nine months ended September 30, 2021, respectively, for various legal, accounting and other professional services fees. There were no costs incurred in the comparable prior year periods. Total transaction costs of $67 million have been incurred since October 2020.

The table below reflects the major assets and liabilities that were transferred to DT Midstream and presented as discontinued operations in the Consolidated Statements of Financial Position as of December 31, 2020.

	December 31, 2020
	(In millions)
Total Assets of Discontinued Operations
Cash	$	42
Accounts receivable	126
Inventories	8
Other	44
Current assets of DT Midstream	220
Less: Previously affiliated amounts eliminated at DTE Energy	3
Current assets of discontinued operations for DTE Energy	217
Investments in equity method investees	1,691
Net property, plant, and equipment	3,470
Goodwill	473
Intangible assets	2,140
Notes receivable	19
Operating lease right-of-use assets	45
Other	21
Noncurrent assets of discontinued operations for DTE Energy	7,859
Total Assets of Discontinued Operations for DTE Energy	$	8,076
Total Liabilities of Discontinued Operations
Accounts payable	$	39
Operating lease liabilities	17
Short-term borrowings due to DTE Energy(a)	2,913
Other	53
Current liabilities of DT Midstream	3,022
Less: Previously affiliated amounts eliminated at DTE Energy	2,923
Current liabilities of discontinued operations for DTE Energy	99
Deferred income taxes	753
Asset retirement obligations	10
Operating lease liabilities	28
Other	45
Noncurrent liabilities of discontinued operations for DTE Energy	836
Total Liabilities of Discontinued Operations for DTE Energy	$	935

______________________________________

(a)Short-term borrowings due to DTE Energy resulted in an intercompany note receivable in the Corporate and Other segment at December 31, 2020. The settlement of these borrowings in June 2021 and use of proceeds to redeem DTE Energy long-term debt in the third quarter 2021 has reduced the Total Assets of the Corporate and Other segment in the current period. Other changes in DTE Energy's Total Assets due to the separation of DT Midstream primarily relate to the elimination of Gas Storage and Pipelines segment assets in 2021.

There were no assets or liabilities from discontinued operations as of September 30, 2021. DT Midstream had net assets of $4.0 billion that separated on July 1, 2021 that resulted in a reduction to DTE Energy's equity during the third quarter. Refer to the Separation of DT Midstream line within DTE Energy's Consolidated Statements of Changes in Equity for further details.

The following table is a summary of significant non-cash items, capital expenditures, and significant financing activities of discontinued operations included in DTE Energy's Consolidated Statements of Cash Flows:

	Nine Months Ended September 30,
	2021		2020
	(In millions)
Operating Activities
Depreciation and amortization	$	82	$	110
Deferred income taxes	57		95
Equity earnings of equity method investees	(59)		(75)
Asset (gains) losses and impairments, net	19		(4)
Investing Activities
Plant and equipment expenditures — non-utility	$	(60)	$	(440)
Financing Activities
Acquisition related deferred payment, excluding accretion	$	—	$	(380)

DTE Vantage Segment Impairment

DTE Vantage owns a pulverized coal facility located at DTE Electric’s River Rouge power plant. The facility provides pulverized coal to a steel industry customer through a supply agreement expiring in 2028. The River Rouge plant provides operation and maintenance services to the facility through an agreement which also expires in 2028.

During the second quarter 2021, DTE Electric retired the River Rouge plant and provided an early termination notice of the operation and maintenance services agreement with the pulverized coal facility. The termination would be effective December 31, 2021, at which point DTE Vantage expects to cease operations at the facility.

In connection with these events, DTE Energy performed an impairment analysis of the pulverized coal facility long-lived assets in accordance with ASC 360, Property, Plant and Equipment. Based on its undiscounted cash flow projections, DTE Energy determined that the carrying value of the pulverized coal facility asset group is not recoverable. As a result, DTE Energy recorded a non-cash impairment charge of $27 million, which is included in Asset (gains) losses and impairments, net on DTE Energy’s Consolidated Statements of Operations for the nine months ended September 30, 2021. The charge included $18 million to fully impair the long-lived assets recorded to Property, plant and equipment and a $9 million write-down of Other noncurrent assets to fair value. Fair value of the assets was determined using an income approach, which utilized assumptions including management’s best estimates of the expected future cash flows, the estimated useful life of the asset group and discount rate.

There were no other adjustments deemed necessary as of September 30, 2021 related to the closure of the facility. DTE Energy is currently monitoring contract negotiations with the steel industry customer to determine any future impacts. An estimate of such impacts cannot be determined at this time as alternatives are currently being evaluated; however, the likelihood of any impact being material to DTE Energy’s Consolidated Financial Statements is remote.

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Revenue

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

Disaggregation of Revenue

The following is a summary of revenues disaggregated by segment for DTE Energy:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric(a)
Residential	$	885	$	900	$	2,262	$	2,169
Commercial	533		498		1,452		1,313
Industrial	167		157		473		434
Other(b)	117		138		290		305
Total Electric operating revenues	$	1,702	$	1,693	$	4,477	$	4,221
Gas
Gas sales	$	95	$	92	$	726	$	655
End User Transportation	38		34		171		154
Intermediate Transportation	16		15		59		57
Other(b)	44		32		114		98
Total Gas operating revenues	$	193	$	173	$	1,070	$	964
Other segment operating revenues
DTE Vantage	$	372	$	324	$	1,132	$	850
Energy Trading	$	1,602	$	1,061	$	4,208	$	2,714

_______________________________________

(a)Revenues generally represent those of DTE Electric, except $2 million and $3 million of Other revenues related to DTE Sustainable Generation for the three months ended September 30, 2021 and 2020, respectively, and $9 million and $10 million for the nine months ended September 30, 2021 and 2020, respectively.

(b)Includes revenue adjustments related to various regulatory mechanisms.

Revenues included the following which were outside the scope of Topic 606:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric — Other revenues	$	6	$	8	$	14	$	18
Gas — Alternative Revenue Programs	—		—		—		2
Gas — Other revenues	1		2		5		7
DTE Vantage — Leases	26		26		70		74
Energy Trading — Derivatives	1,324		731		3,377		1,835

Deferred Revenue

The following is a summary of deferred revenue activity:

	DTE Energy
	(In millions)
Beginning Balance, January 1, 2021(a)	$	65
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	79
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(19)
Ending Balance, September 30, 2021	$	125

_______________________________________

(a)Excludes $22 million of deferred revenue related to the discontinued operations of DT Midstream. Prospective activity includes only the continuing operations of DTE Energy.

The deferred revenues at DTE Energy generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied.

Deferred revenues include amounts associated with REC performance obligations under certain wholesale full requirements power contracts. Deferred revenues associated with RECs are recognized as revenue when control of the RECs has transferred.

Other performance obligations associated with deferred revenues include providing products and services related to customer prepayments. Deferred revenues associated with these products and services are recognized when control has transferred to the customer.

The following table represents deferred revenue amounts for DTE Energy that are expected to be recognized as revenue in future periods:

	DTE Energy
	(In millions)
2021	$	72
2022	50
2023	1
2024	1
2025	—
2026 and thereafter	1
	$	125

Transaction Price Allocated to the Remaining Performance Obligations

In accordance with optional exemptions available under Topic 606, the Registrants did not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which revenue is recognized at the amount to which the Registrants have the right to invoice for goods provided and services performed, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.

Such contracts consist of varying types of performance obligations across the segments, including the supply and delivery of energy related products and services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related consideration under the contract is variable at inception of the contract. Contract lengths vary from cancellable to multi-year.

The Registrants expect to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:

	DTE Energy		DTE Electric
	(In millions)
2021	$	41	$	2
2022	308		8
2023	264		7
2024	159		7
2025	80		1
2026 and thereafter	421		—
	$	1,273	$	25

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Regulatory Matters

9 Months Ended

Sep. 30, 2021

Public Utilities, General Disclosures [Abstract]

Regulatory Matters

REGULATORY MATTERS

2020-2021 Accounting Applications

On July 9, 2020, the MPSC approved DTE Electric's request to accelerate amortization of the portion of its refundable federal income taxes regulatory liability related to non-plant accumulated deferred income tax balances that resulted from the TCJA. DTE Electric was authorized to increase amortization by $102 million beginning in May 2021, which would fully amortize this portion of the liability by the end of 2021 instead of April 2033. The accelerated amortization would not impact customer rates and would allow DTE Electric to defer its next rate case filing previously set for July 2020 to March 2021.

On February 26, 2021, DTE Electric filed an additional application requesting a delay in the accelerated amortization approved in the 2020 application. DTE Electric requested delaying the start of amortization from May 2021 to December 1, 2021, which would fully amortize these balances by the end of 2022 and allow DTE Electric to further defer its next rate case filing. The accounting application was approved by the MPSC on April 8, 2021.

On August 31, 2021, DTE Electric filed an accounting application with the MPSC requesting approval of a one-time voluntary refund of $70 million collected in 2021 associated with the unexpected customer usage patterns due to the COVID-19 pandemic. This refund would be administered by investing in additional tree trimming without seeking future cost recovery. Such efforts would serve to improve customer reliability without impacting rates, thus providing an affordability benefit to customers. These investments would be incremental to the Tree Trim Surge expenses previously authorized by the MPSC.

DTE Electric anticipates receiving an order by the end of 2021. If approved by the end of the year, a regulatory liability will be recognized at that time. The regulatory liability would be reduced as the additional tree trim expenses are incurred during the remainder of 2021 through 2023. If the full $70 million is not spent by the end of 2023, DTE Electric would provide refunds to customers via bill credits for any shortage.

2021 Securitization Filing

On March 26, 2021, DTE Electric filed an application requesting a financing order approving the securitization of $184 million of qualified costs related to the net book value of the River Rouge generation plant and tree trimming surge program costs. The filing requested collection of these qualifying costs from DTE Electric's customers.

A final MPSC order was issued on June 23, 2021 authorizing DTE Electric to proceed with the issuance of securitization bonds for qualified costs of up to $236 million, increased for the inclusion of deferred income taxes. The order authorized customer charges for the timely recovery of the amount securitized and other ongoing qualified costs. Securitization is expected in the first quarter 2022.

2021 Gas Rate Case Filing

DTE Gas filed a rate case with the MPSC on February 12, 2021 requesting an increase in base rates of $195 million based on a projected twelve-month period ending December 31, 2022. The requested increase in base rates is primarily due to an increase in net plant resulting from infrastructure investments and operating and maintenance expenses. The rate filing also requested an increase in return on equity from 9.9% to 10.25% and includes projected changes in sales and working capital. A final MPSC order in this case is expected by December 2021.

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Common Stock and Earnings Per Share

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Common Stock and Earnings Per Share

COMMON STOCK AND EARNINGS PER SHARE

Earnings per Share

Basic earnings per share is calculated by dividing net income, adjusted for income allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution that would occur if any potentially dilutive instruments were exercised or converted into common shares. DTE Energy’s participating securities are restricted shares under the stock incentive program that contain rights to receive non-forfeitable dividends. Equity units and performance shares do not receive cash dividends; as such, these awards are not considered participating securities.

The following is a reconciliation of DTE Energy's basic and diluted income per share calculation:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions, except per share amounts)
Basic Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Less: Allocation of earnings to net restricted stock awards	—		1		1		2
	$	58	$	371	$	494	$	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)		104		106		249
Net income available to common shareholders — basic	$	25	$	475	$	600	$	1,091
Average number of common shares outstanding — basic	193		193		193		192
Income from continuing operations	$	0.30	$	1.93	$	2.55	$	4.37
Income (loss) from discontinued operations	(0.17)		0.54		0.55		1.30
Basic Earnings per Common Share	$	0.13	$	2.47	$	3.10	$	5.67
Diluted Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Less: Allocation of earnings to net restricted stock awards	—		1		1		2
	$	58	$	371	$	494	$	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)		104		106		249
Net income available to common shareholders — diluted	$	25	$	475	$	600	$	1,091
Average number of common shares outstanding — basic	193		193		193		192
Average dilutive equity units, performance share awards, and stock options	1		—		1		1
Average number of common shares outstanding — diluted	194		193		194		193
Income from continuing operations	$	0.30	$	1.92	$	2.55	$	4.37
Income (loss) from discontinued operations	(0.17)		0.54		0.55		1.29
Diluted Earnings per Common Share(a)	$	0.13	$	2.46	$	3.10	$	5.66

_______________________________________

(a)Equity Units excluded from the calculation of diluted EPS were approximately 11.1 million and 10.3 million for the three months ended September 30, 2021 and 2020, respectively, and 11.5 million and 10.3 million for the nine months ended September 30, 2021 and 2020, respectively, as the dilutive stock price threshold was not met.

Stock Purchase Contract Adjustments

In December 2019, DTE Energy closed on the purchase of midstream natural gas assets. The acquisition was financed through the issuance of Senior Notes, common stock, and $1.3 billion of Equity Units. Each Equity Unit has a stated amount of $50 and was initially issued in the form of a Corporate Unit, comprised of (i) a forward purchase contract to buy DTE Energy common stock (stock purchase contract) and (ii) a 1/20 undivided beneficial ownership interest in a $1,000 principal amount of DTE Energy’s 2019 Series F 2.25% RSNs due 2025.

The stock purchase contract obligates the holder to purchase from DTE Energy on the settlement date, November 1, 2022, for a price of $50 per stock purchase contract, a certain number of shares of DTE Energy’s common stock. As a result of the spin-off of DT Midstream in July 2021, there was a change in the settlement rates in the stock purchase contract to reflect the dividend of DT Midstream stock to DTE Energy shareholders. As adjusted for this change, anti-dilution adjustments to date, and subject to future anti-dilution adjustments, the following number of shares must be purchased:

•if the AMV of DTE Energy’s common stock, which is the average volume-weighted average price of DTE Energy’s common stock for the trading days during the 20 consecutive scheduled trading day period ending on the third scheduled trading day immediately preceding the stock purchase contract settlement date, is equal to or greater than $133.08, 0.3757 shares of common stock;

•if the AMV is less than $133.08 but greater than $106.50, a number of shares of common stock equal to $50 divided by the AMV; and

•if the AMV is less than or equal to $106.50, 0.4695 shares of common stock.

The present value of future contract adjustment payments of $150 million was initially recorded as a reduction of shareholders’ equity, offset by the stock purchase contract liability. The stock purchase contract liability was not impacted by the change in settlement rates and a liability of $64 million remains included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy’s Consolidated Statements of Financial Position as of September 30, 2021. DTE Energy will continue issuing quarterly payments through the settlement date of November 1, 2022.

The treasury stock method is used to compute diluted EPS for the stock purchase contract. Under the treasury stock method, the stock purchase contract will only have a dilutive effect when the settlement rate is based on the market value of DTE’s common stock that is greater than $133.08 (the threshold appreciation price). At September 30, 2021, the stock purchase price contract was anti-dilutive and, therefore, not included in the computation of diluted earnings per share.

Until settlement of the stock purchase contracts, the shares of stock underlying each contract are not outstanding. Under the terms of the stock purchase contracts, assuming no anti-dilution or other adjustments, DTE Energy will issue between 9.8 million and 12.2 million shares of its common stock in November 2022. A total of 13 million shares of DTE Energy’s common stock have been reserved for issuance in connection with the stock purchase contracts.

For additional information regarding the equity units, refer to Note 15, "Long-term Debt" in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.

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Fair Value

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value

FAIR VALUE

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. The Registrants make certain assumptions they believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Registrants and their counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at September 30, 2021 and December 31, 2020. The Registrants believe they use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Registrants classify fair value balances based on the fair value hierarchy defined as follows:

•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Registrants have the ability to access as of the reporting date.

•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

The following table presents assets and liabilities for DTE Energy measured and recorded at fair value on a recurring basis:

	September 30, 2021												December 31, 2020
	Level 1		Level 2		Level 3		Other(a)		Netting(b)		Net Balance		Level 1		Level 2		Level 3		Other(a)		Netting(b)		Net Balance
	(In millions)
Assets
Cash equivalents(c)	$	9	$	—	$	—	$	—	$	—	$	9	$	438	$	—	$	—	$	—	$	—	$	438
Nuclear decommissioning trusts
Equity securities	944		—		—		196		—		1,140		947		—		—		222		—		1,169
Fixed income securities	127		429		—		102		—		658		102		371		—		82		—		555
Private equity and other	—		—		—		175		—		175		—		—		—		104		—		104
Cash equivalents	34		—		—		—		—		34		27		—		—		—		—		27
Other investments(d)
Equity securities	61		—		—		—		—		61		55		—		—		—		—		55
Fixed income securities	7		—		—		—		—		7		8		—		—		—		—		8
Cash equivalents	86		—		—		—		—		86		97		—		—		—		—		97
Derivative assets
Commodity contracts(e)
Natural gas	579		146		53		—		(715)		63		99		74		60		—		(156)		77
Electricity	—		707		245		—		(627)		325		—		128		52		—		(120)		60
Environmental & Other	—		598		12		—		(570)		40		—		150		4		—		(135)		19
Total derivative assets	579		1,451		310		—		(1,912)		428		99		352		116		—		(411)		156
Total	$	1,847	$	1,880	$	310	$	473	$	(1,912)	$	2,598	$	1,773	$	723	$	116	$	408	$	(411)	$	2,609
Liabilities
Derivative liabilities
Commodity contracts(e)
Natural gas	$	(425)	$	(297)	$	(333)	$	—	$	664	$	(391)	$	(88)	$	(59)	$	(76)	$	—	$	151	$	(72)
Electricity	—		(576)		(340)		—		614		(302)		—		(126)		(42)		—		125		(43)
Environmental & Other	—		(581)		—		—		570		(11)		—		(137)		—		—		129		(8)
Foreign currency exchange contracts	—		(5)		—		—		—		(5)		—		(5)				—		—		(5)
Total	$	(425)	$	(1,459)	$	(673)	$	—	$	1,848	$	(709)	$	(88)	$	(327)	$	(118)	$	—	$	405	$	(128)
Net Assets (Liabilities) at end of period	$	1,422	$	421	$	(363)	$	473	$	(64)	$	1,889	$	1,685	$	396	$	(2)	$	408	$	(6)	$	2,481
Assets
Current	$	506	$	1,183	$	258	$	—	$	(1,591)	$	356	$	532	$	260	$	92	$	—	$	(330)	$	554
Noncurrent	1,341		697		52		473		(321)		2,242		1,241		463		24		408		(81)		2,055
Total Assets	$	1,847	$	1,880	$	310	$	473	$	(1,912)	$	2,598	$	1,773	$	723	$	116	$	408	$	(411)	$	2,609
Liabilities
Current	$	(409)	$	(1,138)	$	(464)	$	—	$	1,546	$	(465)	$	(84)	$	(223)	$	(79)	$	—	$	318	$	(68)
Noncurrent	(16)		(321)		(209)		—		302		(244)		(4)		(104)		(39)		—		87		(60)
Total Liabilities	$	(425)	$	(1,459)	$	(673)	$	—	$	1,848	$	(709)	$	(88)	$	(327)	$	(118)	$	—	$	405	$	(128)
Net Assets (Liabilities) at end of period	$	1,422	$	421	$	(363)	$	473	$	(64)	$	1,889	$	1,685	$	396	$	(2)	$	408	$	(6)	$	2,481

_______________________________________

(a)Amounts represent assets valued at NAV as a practical expedient for fair value.

(b)Amounts represent the impact of master netting agreements that allow DTE Energy to net gain and loss positions and cash collateral held or placed with the same counterparties.

(c)Amounts consisted of $1 million and $2 million of cash equivalents included in Restricted cash on DTE Energy's Consolidated Statements of Financial Position at September 30, 2021 and December 31, 2020, respectively. All other amounts are included in Cash and cash equivalents on the Consolidated Statements of Financial Position.

(d)Excludes cash surrender value of life insurance investments.

(e)For contracts with a clearing agent, DTE Energy nets all activity across commodities. This can result in some individual commodities having a contra balance.

The following table presents assets for DTE Electric measured and recorded at fair value on a recurring basis as of:

	September 30, 2021										December 31, 2020
	Level 1		Level 2		Level 3		Other(a)		Net Balance		Level 1		Level 2		Level 3		Other(a)		Net Balance
	(In millions)
Assets
Cash equivalents	$	—	$	—	$	—	$	—	$	—	$	4	$	—	$	—	$	—	$	4
Nuclear decommissioning trusts
Equity securities	944		—		—		196		1,140		947		—		—		222		1,169
Fixed income securities	127		429		—		102		658		102		371		—		82		555
Private equity and other	—		—		—		175		175		—		—		—		104		104
Cash equivalents	34		—		—		—		34		27		—		—		—		27
Other investments
Equity securities	18		—		—		—		18		16		—		—		—		16
Cash equivalents	11		—		—		—		11		11		—		—		—		11
Derivative assets — FTRs	—		—		12		—		12		—		—		4		—		4
Total	$	1,134	$	429	$	12	$	473	$	2,048	$	1,107	$	371	$	4	$	408	$	1,890
Assets
Current	$	—	$	—	$	12	$	—	$	12	$	4	$	—	$	4	$	—	$	8
Noncurrent	1,134		429		—		473		2,036		1,103		371		—		408		1,882
Total Assets	$	1,134	$	429	$	12	$	473	$	2,048	$	1,107	$	371	$	4	$	408	$	1,890

_______________________________________

(a)Amounts represent assets valued at NAV as a practical expedient for fair value.

Cash Equivalents

Cash equivalents include investments with maturities of three months or less when purchased. The cash equivalents shown in the fair value table are comprised of short-term investments and money market funds.

Nuclear Decommissioning Trusts and Other Investments

The nuclear decommissioning trusts and other investments hold debt and equity securities directly and indirectly through commingled funds. Exchange-traded debt and equity securities held directly, as well as publicly-traded commingled funds, are valued using quoted market prices in actively traded markets. Non-exchange traded fixed income securities are valued based upon quotations available from brokers or pricing services.

Non-publicly traded commingled funds holding exchange-traded equity or debt securities are valued based on stated NAVs. There are no significant restrictions for these funds and investments may be redeemed with 7 to 65 days notice depending on the fund. There is no intention to sell the investment in these commingled funds.

Private equity and other assets include a diversified group of funds that are classified as NAV assets. These funds primarily invest in limited partnerships, including private equity, private real estate and private credit. Distributions are received through the liquidation of the underlying fund assets over the life of the funds. There are generally no redemption rights. The limited partner must hold the fund for its life or find a third-party buyer, which may need to be approved by the general partner. The funds are established with varied contractual durations generally in the range of 7 years to 12 years. The fund life can often be extended by several years by the general partner, and further extended with the approval of the limited partners. Unfunded commitments related to these investments totaled $155 million and $183 million as of September 30, 2021 and December 31, 2020, respectively.

For pricing the nuclear decommissioning trusts and other investments, a primary price source is identified by asset type, class, or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary source of a given security if the trustee determines that another price source is considered preferable. The Registrants have obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices.

Derivative Assets and Liabilities

Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options, and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. The Registrants consider the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time, and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality, and basis differential factors. The Registrants monitor the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. The Registrants have obtained an understanding of how these prices are derived. Additionally, the Registrants selectively corroborate the fair value of their transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period. The Registrants have established a Risk Management Committee whose responsibilities include directly or indirectly ensuring all valuation methods are applied in accordance with predefined policies. The development and maintenance of the Registrants' forward price curves has been assigned to DTE Energy's Risk Management Department, which is separate and distinct from the trading functions within DTE Energy.

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Energy:

	Three Months Ended September 30, 2021								Three Months Ended September 30, 2020
	Natural Gas		Electricity		Other		Total		Natural Gas		Electricity		Other		Total
	(In millions)
Net Assets (Liabilities) as of June 30	$	(181)	$	(49)	$	15	$	(215)	$	20	$	16	$	10	$	46
Transfers from Level 3 into Level 2	—		—		—		—		(1)		—		—		(1)
Total gains (losses)
Included in earnings(a)	(162)		(21)		—		(183)		(80)		37		1		(42)
Recorded in Regulatory liabilities	—		—		(1)		(1)		—		—		9		9
Purchases, issuances, and settlements
Settlements	63		(25)		(2)		36		22		(48)		(13)		(39)
Net Assets (Liabilities) as of September 30	$	(280)	$	(95)	$	12	$	(363)	$	(39)	$	5	$	7	$	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30(a)	$	(109)	$	(30)	$	(2)	$	(141)	$	(57)	$	11	$	(1)	$	(47)

_______________________________________

(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.

	Nine Months Ended September 30, 2021								Nine Months Ended September 30, 2020
	Natural Gas		Electricity		Other		Total		Natural Gas		Electricity		Other		Total
	(In millions)
Net Assets (Liabilities) as of December 31	$	(16)	$	10	$	4	$	(2)	$	(15)	$	16	$	3	$	4
Transfers from Level 3 into Level 2	—		—		—		—		(5)		—		—		(5)
Total gains (losses)
Included in earnings(a)	(356)		(5)		—		(361)		(44)		90		(7)		39
Recorded in Regulatory liabilities	—		—		14		14		—		—		21		21
Purchases, issuances, and settlements
Settlements	92		(100)		(6)		(14)		25		(101)		(10)		(86)
Net Assets (Liabilities) as of September 30	$	(280)	$	(95)	$	12	$	(363)	$	(39)	$	5	$	7	$	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30(a)	$	(301)	$	(54)	$	(17)	$	(372)	$	(20)	$	53	$	(17)	$	16
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30	$	—	$	—	$	12	$	12	$	—	$	—	$	7	$	7

_______________________________________

(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Assets as of beginning of period	$	15	$	10	$	4	$	3
Change in fair value recorded in Regulatory liabilities	(1)		9		14		21
Purchases, issuances, and settlements
Settlements	(2)		(12)		(6)		(17)
Net Assets as of September 30	$	12	$	7	$	12	$	7
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30	$	—	$	—	$	12	$	7

Derivatives are transferred between levels primarily due to changes in the source data used to construct price curves as a result of changes in market liquidity. Transfers in and transfers out are reflected as if they had occurred at the beginning of the period. There were no transfers from or into Level 3 for DTE Electric during the three and nine months ended September 30, 2021 and 2020.

The following tables present the unobservable inputs related to DTE Energy's Level 3 assets and liabilities:

	September 30, 2021
Commodity Contracts	Derivative Assets		Derivative Liabilities		Valuation Techniques	Unobservable Input	Range						Weighted Average
	(In millions)
Natural Gas	$	53	$	(333)	Discounted Cash Flow	Forward basis price (per MMBtu)	$	(1.33)	—	$	3.53	/MMBtu	$	(0.04)	/MMBtu
Electricity	$	245	$	(340)	Discounted Cash Flow	Forward basis price (per MWh)	$	(8)	—	$	10	/MWh	$	(1)	/MWh

	December 31, 2020
Commodity Contracts	Derivative Assets		Derivative Liabilities		Valuation Techniques	Unobservable Input	Range						Weighted Average
	(In millions)
Natural Gas	$	60	$	(76)	Discounted Cash Flow	Forward basis price (per MMBtu)	$	(0.86)	—	$	2.50	/MMBtu	$	(0.07)	/MMBtu
Electricity	$	52	$	(42)	Discounted Cash Flow	Forward basis price (per MWh)	$	(9)	—	$	6	/MWh	$	—	/MWh

The unobservable inputs used in the fair value measurement of the electricity and natural gas commodity types consist of inputs that are less observable due in part to lack of available broker quotes, supported by little, if any, market activity at the measurement date or are based on internally developed models. Certain basis prices (i.e., the difference in pricing between two locations) included in the valuation of natural gas and electricity contracts were deemed unobservable. The weighted average price for unobservable inputs was calculated using the average of forward price curves for natural gas and electricity and the absolute value of monthly volumes.

The inputs listed above would have had a direct impact on the fair values of the above security types if they were adjusted. A significant increase (decrease) in the basis price would have resulted in a higher (lower) fair value for long positions, with offsetting impacts to short positions.

Fair Value of Financial Instruments

The following table presents the carrying amount and fair value of financial instruments for DTE Energy:

	September 30, 2021								December 31, 2020
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(In millions)
Notes receivable(a), excluding lessor finance leases	$	142	$	—	$	—	$	142	$	141	$	—	$	—	$	141
Short-term borrowings	$	361	$	—	$	361	$	—	$	38	$	—	$	38	$	—
Notes payable(b)	$	5	$	—	$	—	$	5	$	19	$	—	$	—	$	19
Long-term debt(c)	$	17,222	$	2,241	$	15,486	$	1,104	$	19,439	$	2,547	$	18,230	$	1,397

_______________________________________

(a)Current portion included in Current Assets — Other on DTE Energy's Consolidated Statements of Financial Position.

(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy's Consolidated Statements of Financial Position.

(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.

The following table presents the carrying amount and fair value of financial instruments for DTE Electric:

	September 30, 2021								December 31, 2020
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(In millions)
Notes receivable(a)	$	17	$	—	$	—	$	17	$	16	$	—	$	—	$	16
Short-term borrowings — affiliates	$	32	$	—	$	—	$	32	$	101	$	—	$	—	$	101
Short-term borrowings — other	$	159	$	—	$	159	$	—	$	—	$	—	$	—	$	—
Notes payable(b)	$	4	$	—	$	—	$	4	$	17	$	—	$	—	$	17
Long-term debt(c)	$	8,906	$	—	$	9,952	$	150	$	8,236	$	—	$	9,579	$	379

_______________________________________

(a)Included in Current Assets — Other on DTE Electric's Consolidated Statements of Financial Position.

(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Electric's Consolidated Statements of Financial Position.

(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.

For further fair value information on financial and derivative instruments, see Note 9 to the Consolidated Financial Statements, "Financial and Other Derivative Instruments."

Nuclear Decommissioning Trust Funds

DTE Electric has a legal obligation to decommission its nuclear power plants following the expiration of its operating licenses. This obligation is reflected as an Asset retirement obligation on DTE Electric's Consolidated Statements of Financial Position. Rates approved by the MPSC provide for the recovery of decommissioning costs of Fermi 2 and the disposal of low-level radioactive waste.

The following table summarizes DTE Electric's fair value of the nuclear decommissioning trust fund assets:

	September 30, 2021		December 31, 2020
	(In millions)
Fermi 2	$	1,989	$	1,841
Fermi 1	3		3
Low-level radioactive waste	15		11
	$	2,007	$	1,855

The costs of securities sold are determined on the basis of specific identification. The following table sets forth DTE Electric's gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Realized gains	$	21	$	38	$	80	$	172
Realized losses	$	(1)	$	(11)	$	(9)	$	(103)
Proceeds from sale of securities	$	217	$	816	$	854	$	2,054

Realized gains and losses from the sale of securities and unrealized gains and losses incurred by the Fermi 2 trust are recorded to Regulatory assets and the Nuclear decommissioning liability. Realized gains and losses from the sale of securities and unrealized gains and losses on the low-level radioactive waste funds are recorded to the Nuclear decommissioning liability.

The following table sets forth DTE Electric's fair value and unrealized gains and losses for the nuclear decommissioning trust funds:

	September 30, 2021						December 31, 2020
	Fair Value		Unrealized Gains		Unrealized Losses		Fair Value		Unrealized Gains		Unrealized Losses
	(In millions)
Equity securities	$	1,140	$	507	$	(8)	$	1,169	$	481	$	(6)
Fixed income securities	658		24		(5)		555		20		(1)
Private equity and other	175		41		(2)		104		—		—
Cash equivalents	34		—		—		27		—		—
	$	2,007	$	572	$	(15)	$	1,855	$	501	$	(7)

The following table summarizes the fair value of the fixed income securities held in nuclear decommissioning trust funds by contractual maturity:

	September 30, 2021
	(In millions)
Due within one year	$	11
Due after one through five years	138
Due after five through ten years	112
Due after ten years	295
	$	556

Fixed income securities held in nuclear decommissioning trust funds include $102 million of non-publicly traded commingled funds that do not have a contractual maturity date.

Other Securities

At September 30, 2021 and December 31, 2020, the Registrants' securities included in Other investments on the Consolidated Statements of Financial Position were comprised primarily of investments within DTE Energy's rabbi trust. The rabbi trust was established to fund certain non-qualified pension benefits, and therefore changes in market value are recognized in earnings. Gains and losses are allocated from DTE Energy to DTE Electric and are included in Other Income or Other Expense, respectively, in the Registrants' Consolidated Statements of Operations. The following table summarizes the Registrant's gains (losses) related to the trust:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Gains (losses) related to equity securities	$	(1)	$	2	$	3	$	(4)
Gains (losses) related to fixed income securities	—		—		—		(3)
	$	(1)	$	2	$	3	$	(7)

XML

Financial and Other Derivative Instruments

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial and Other Derivative Instruments

FINANCIAL AND OTHER DERIVATIVE INSTRUMENTS

The Registrants recognize all derivatives at their fair value as Derivative assets or liabilities on their respective Consolidated Statements of Financial Position unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the derivative gain or loss is deferred in Accumulated other comprehensive income (loss) and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative and hedged item are recognized in earnings each period. For derivatives that do not qualify or are not designated for hedge accounting, changes in fair value are recognized in earnings each period.

The Registrants' primary market risk exposure is associated with commodity prices, credit, and interest rates. The Registrants have risk management policies to monitor and manage market risks. The Registrants use derivative instruments to manage some of the exposure. DTE Energy uses derivative instruments for trading purposes in its Energy Trading segment. Contracts classified as derivative instruments include electricity, natural gas, oil, certain environmental contracts, forwards, futures, options, swaps, and foreign currency exchange contracts. Items not classified as derivatives include natural gas and environmental inventory, pipeline transportation contracts, certain environmental contracts, and natural gas storage assets.

DTE Electric — DTE Electric generates, purchases, distributes, and sells electricity. DTE Electric uses forward contracts to manage changes in the price of electricity and fuel. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Other derivative contracts are MTM and recoverable through the PSCR mechanism when settled. This results in the deferral of unrealized gains and losses as Regulatory assets or liabilities until realized.

DTE Gas — DTE Gas purchases, stores, transports, distributes, and sells natural gas, and buys and sells transportation and storage capacity. DTE Gas has fixed-priced contracts for portions of its expected natural gas supply requirements through March 2024. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Forward transportation and storage contracts are generally not derivatives and are therefore accounted for under the accrual method.

DTE Vantage — This segment manages and operates industrial energy projects, reduced emissions fuel projects, renewable gas recovery, and power generation assets. Primarily fixed-price contracts are used in the marketing and management of the segment assets. These contracts are generally not derivatives and are therefore accounted for under the accrual method.

Energy Trading — Commodity Price Risk — Energy Trading markets and trades electricity, natural gas physical products, and energy financial instruments, and provides energy and asset management services utilizing energy commodity derivative instruments. Forwards, futures, options, and swap agreements are used to manage exposure to the risk of market price and volume fluctuations in its operations. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.

Energy Trading — Foreign Currency Exchange Risk — Energy Trading has foreign currency exchange forward contracts to economically hedge fixed Canadian dollar commitments existing under natural gas and power purchase and sale contracts and natural gas transportation contracts. Energy Trading enters into these contracts to mitigate price volatility with respect to fluctuations of the Canadian dollar relative to the U.S. dollar. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.

Corporate and Other — Interest Rate Risk — DTE Energy may use interest rate swaps, treasury locks, and other derivatives to hedge the risk associated with interest rate market volatility.

Credit Risk — DTE Energy maintains credit policies that significantly minimize overall credit risk. These policies include an evaluation of potential customers’ and counterparties’ financial condition, including the viability of underlying productive assets, credit rating, collateral requirements, or other credit enhancements such as letters of credit or guarantees. DTE Energy generally uses standardized agreements that allow the netting of positive and negative transactions associated with a single counterparty. DTE Energy maintains a provision for credit losses based on factors surrounding the credit risk of its customers, historical trends, and other information. Based on DTE Energy's credit policies and its September 30, 2021 provision for credit losses, DTE Energy’s exposure to counterparty nonperformance is not expected to have a material adverse effect on DTE Energy's Consolidated Financial Statements.

Derivative Activities

DTE Energy manages its MTM risk on a portfolio basis based upon the delivery period of its contracts and the individual components of the risks within each contract. Accordingly, it records and manages the energy purchase and sale obligations under its contracts in separate components based on the commodity (e.g. electricity or natural gas), the product (e.g. electricity for delivery during peak or off-peak hours), the delivery location (e.g. by region), the risk profile (e.g. forward or option), and the delivery period (e.g. by month and year). The following describes the categories of activities represented by their operating characteristics and key risks:

•Asset Optimization — Represents derivative activity associated with assets owned and contracted by DTE Energy, including forward natural gas purchases and sales, natural gas transportation, and storage capacity. Changes in the value of derivatives in this category typically economically offset changes in the value of underlying non-derivative positions, which do not qualify for fair value accounting. The difference in accounting treatment of derivatives in this category and the underlying non-derivative positions can result in significant earnings volatility.

•Marketing and Origination — Represents derivative activity transacted by originating substantially hedged positions with wholesale energy marketers, producers, end-users, utilities, retail aggregators, and alternative energy suppliers.

•Fundamentals Based Trading — Represents derivative activity transacted with the intent of taking a view, capturing market price changes, or putting capital at risk. This activity is speculative in nature as opposed to hedging an existing exposure.

•Other — Includes derivative activity at DTE Electric related to FTRs. Changes in the value of derivative contracts at DTE Electric are recorded as Derivative assets or liabilities, with an offset to Regulatory assets or liabilities as the settlement value of these contracts will be included in the PSCR mechanism when realized.

The following table presents the fair value of derivative instruments for DTE Energy:

	September 30, 2021				December 31, 2020
	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
	(In millions)
Derivatives designated as hedging instruments
Foreign currency exchange contracts	$	—	$	(3)	$	—	$	(4)
Derivatives not designated as hedging instruments
Commodity contracts
Natural gas	$	778	$	(1,055)	$	233	$	(223)
Electricity	952		(916)		180		(168)
Environmental & Other	610		(581)		154		(137)
Foreign currency exchange contracts	—		(2)		—		(1)
Total derivatives not designated as hedging instruments	$	2,340	$	(2,554)	$	567	$	(529)
Current	$	1,938	$	(2,011)	$	446	$	(386)
Noncurrent	402		(546)		121		(147)
Total derivatives	$	2,340	$	(2,557)	$	567	$	(533)

The following table presents the fair value of derivative instruments for DTE Electric:

	September 30, 2021		December 31, 2020
	(In millions)
FTRs — Other current assets	$	12	$	4
Total derivatives not designated as hedging instruments	$	12	$	4

Certain of DTE Energy's derivative positions are subject to netting arrangements which provide for offsetting of asset and liability positions as well as related cash collateral. Such netting arrangements generally do not have restrictions. Under such netting arrangements, DTE Energy offsets the fair value of derivative instruments with cash collateral received or paid for those contracts executed with the same counterparty, which reduces DTE Energy's Total Assets and Liabilities. Cash collateral is allocated between the fair value of derivative instruments and customer accounts receivable and payable with the same counterparty on a pro-rata basis to the extent there is exposure. Any cash collateral remaining, after the exposure is netted to zero, is reflected in Accounts receivable and Accounts payable as collateral paid or received, respectively.

DTE Energy also provides and receives collateral in the form of letters of credit which can be offset against net Derivative assets and liabilities as well as Accounts receivable and payable. DTE Energy had issued letters of credit of $20 million and $7 million outstanding at September 30, 2021 and December 31, 2020, respectively, which could be used to offset net Derivative liabilities. Letters of credit received from third parties which could be used to offset net Derivative assets were $55 million and $9 million at September 30, 2021 and December 31, 2020, respectively. Such balances of letters of credit are excluded from the tables below and are not netted with the recognized assets and liabilities in DTE Energy's Consolidated Statements of Financial Position.

For contracts with certain clearing agents, the fair value of derivative instruments is netted against realized positions with the net balance reflected as either 1) a Derivative asset or liability or 2) an Account receivable or payable. Other than certain clearing agents, Accounts receivable and Accounts payable that are subject to netting arrangements have not been offset against the fair value of Derivative assets and liabilities.

The following table presents net cash collateral offsetting arrangements for DTE Energy:

	September 30, 2021		December 31, 2020
	(In millions)
Cash collateral netted against Derivative assets	$	(122)	$	(12)
Cash collateral netted against Derivative liabilities	58		6
Cash collateral recorded in Accounts receivable(a)	66		14
Cash collateral recorded in Accounts payable(a)	(8)		(1)
Total net cash collateral posted (received)	$	(6)	$	7

_______________________________________

(a)Amounts are recorded net by counterparty.

The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:

	September 30, 2021						December 31, 2020
	Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position		Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
	(In millions)
Derivative assets
Commodity contracts
Natural gas	$	778	$	(715)	$	63	$	233	$	(156)	$	77
Electricity	952		(627)		325		180		(120)		60
Environmental & Other	610		(570)		40		154		(135)		19
Total derivative assets	$	2,340	$	(1,912)	$	428	$	567	$	(411)	$	156
Derivative liabilities
Commodity contracts
Natural gas	$	(1,055)	$	664	$	(391)	$	(223)	$	151	$	(72)
Electricity	(916)		614		(302)		(168)		125		(43)
Environmental & Other	(581)		570		(11)		(137)		129		(8)
Foreign currency exchange contracts	(5)		—		(5)		(5)		—		(5)
Total derivative liabilities	$	(2,557)	$	1,848	$	(709)	$	(533)	$	405	$	(128)

The following table presents the netting offsets of Derivative assets and liabilities showing the reconciliation of derivative instruments to DTE Energy's Consolidated Statements of Financial Position:

	September 30, 2021								December 31, 2020
	Derivative Assets				Derivative Liabilities				Derivative Assets				Derivative Liabilities
	Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
	(In millions)
Total fair value of derivatives	$	1,938	$	402	$	(2,011)	$	(546)	$	446	$	121	$	(386)	$	(147)
Counterparty netting	(1,498)		(292)		1,498		292		(318)		(81)		318		81
Collateral adjustment	(93)		(29)		48		10		(12)		—		—		6
Total derivatives as reported	$	347	$	81	$	(465)	$	(244)	$	116	$	40	$	(68)	$	(60)

The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations is as follows:

	Location of Gain (Loss) Recognized in Income on Derivatives	Gain (Loss) Recognized in Income on Derivatives for the Three Months Ended September 30,				Gain (Loss) Recognized in Income on Derivatives for the Nine Months Ended September 30,
		2021		2020		2021		2020
		(In millions)
Commodity contracts
Natural gas	Operating Revenues — Non-utility operations	$	(214)	$	(27)	$	(371)	$	(63)
Natural gas	Fuel, purchased power, gas, and other — non-utility	63		(51)		(16)		28
Electricity	Operating Revenues — Non-utility operations	68		33		143		75
Environmental & Other	Operating Revenues — Non-utility operations	3		2		(36)		(40)
Foreign currency exchange contracts	Operating Revenues — Non-utility operations	2		(2)		(1)		—
Total		$	(78)	$	(45)	$	(281)	$	—

Revenues and energy costs related to trading contracts are presented on a net basis in DTE Energy's Consolidated Statements of Operations. Commodity derivatives used for trading purposes, and financial non-trading commodity derivatives, are accounted for using the MTM method with unrealized and realized gains and losses recorded in Operating Revenues — Non-utility operations. Non-trading physical commodity sale and purchase derivative contracts are generally accounted for using the MTM method with unrealized and realized gains and losses for sales recorded in Operating Revenues — Non-utility operations and purchases recorded in Fuel, purchased power, gas, and other — non-utility.

The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of September 30, 2021:

Commodity	Number of Units
Natural gas (MMBtu)	2,096,409,912
Electricity (MWh)	29,383,562
Foreign currency exchange ($ CAD)	119,281,865
Renewable Energy Certificates (MWh)	8,387,594
Carbon emissions (Metric Tons)	48,343,793

Various subsidiaries of DTE Energy have entered into contracts which contain ratings triggers and are guaranteed by DTE Energy. These contracts contain provisions which allow the counterparties to require that DTE Energy post cash or letters of credit as collateral in the event that DTE Energy’s credit rating is downgraded below investment grade. Certain of these provisions (known as "hard triggers") state specific circumstances under which DTE Energy can be required to post collateral upon the occurrence of a credit downgrade, while other provisions (known as "soft triggers") are not as specific. For contracts with soft triggers, it is difficult to estimate the amount of collateral which may be requested by counterparties and/or which DTE Energy may ultimately be required to post. The amount of such collateral which could be requested fluctuates based on commodity prices (primarily natural gas, power, environmental, and coal) and the provisions and maturities of the underlying transactions. As of September 30, 2021, DTE Energy's contractual obligation to post collateral in the form of cash or letters of credit in the event of a downgrade to below investment grade, under both hard trigger and soft trigger provisions, was $575 million.

As of September 30, 2021, DTE Energy had $2,180 million of derivatives in net liability positions, for which hard triggers exist. There is $52 million of collateral that has been posted against such liabilities, including cash and letters of credit. Associated derivative net asset positions for which contractual offset exists were $1,788 million. The net remaining amount of $340 million is derived from the $575 million noted above.

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Long-Term Debt

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Long-Term Debt

LONG-TERM DEBT

Debt Issuances

In 2021, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	March	Mortgage bonds(a)	1.90%	2028	$	575
DTE Electric	March	Mortgage bonds(a)	3.25%	2051	425
DT Midstream	June	Senior notes(b)	4.125%	2029	1,100
DT Midstream	June	Senior notes(b)	4.375%	2031	1,000
DT Midstream	June	Term loan facility(b)	Variable	2028	1,000
					$	4,100

_______________________________________

(a)Bonds were issued as Green Bonds and the proceeds will be used to finance qualified expenditures for solar and wind energy, payments under power purchase agreements for solar and wind energy, and energy optimization programs.

(b)Proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. The debt was transferred to DT Midstream upon its separation on July 1, 2021. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information and to the Debt Redemptions section below for DTE Energy's use of the proceeds received from DT Midstream.

In September 2021, DTE Electric completed a mandatory remarketing of $82 million of 1.45% Tax-Exempt Revenue Bonds at the same rate of 1.45% until maturity in 2030 and $59 million of 1.45% Tax-Exempt Revenue Bonds at a rate of 1.35% until maturity in 2029.

Additionally in September 2021, DTE Gas agreed to issue $60 million of 2.07% First Mortgage Bonds due December 1, 2031 and $95 million of 2.85% First Mortgage Bonds due December 1, 2051 to a group of institutional investors in a private placement transaction. These bonds are expected to close and fund in November 2021. Proceeds will be used for the repayment of short-term borrowings and general corporate purposes, including capital expenditures.

Debt Redemptions

In 2021, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	April	Mortgage bonds	3.90%	2021	$	250
DTE Electric	May	Mortgage bonds	7.00%	2021	33
DTE Energy	June	Junior subordinated debentures(a)	5.375%	2076	300
DTE Energy	July	Senior notes	3.30%	2022	300
DTE Energy	July	Senior notes	2.60%	2022	300
DTE Energy	July	Senior notes	3.70%	2023	600
DTE Energy	July	Senior notes	3.85%	2023	135
DTE Energy	July	Senior notes	3.50%	2024	350
DTE Energy	July	Senior notes	3.80%	2027	350
DTE Energy	July	Senior notes	3.40%	2029	21
DTE Energy	July	Senior notes	6.375%	2033	191
DTE Energy	August	Senior notes	3.85%	2023	165
DTE Energy	August	Senior notes	6.375%	2033	209
DTE Electric	August	Mortgage bonds	6.90%	2021	38
					$	3,242

_______________________________________

(a)Early redemption resulted in a loss on extinguishment of debt of $8 million relating to the write-off of unamortized issuance costs.

During the third quarter 2021, DTE Energy optionally redeemed $2.6 billion of Senior Notes included in the table above using proceeds from DT Midstream's repayment of short-term borrowings and one-time special dividend. To early retire this debt and reduce future interest expense, DTE Energy incurred prepayment costs of $361 million and wrote off $15 million of unamortized issuance costs and discounts related to the debt. These amounts have been included within the Loss on extinguishment of debt line item within the Consolidated Statements of Operations for the three and nine months ended September 30, 2021.

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Short-Term Credit Arrangements and Borrowings

9 Months Ended

Sep. 30, 2021

Short-term Debt [Abstract]

Short-Term Credit Arrangements and Borrowings

SHORT-TERM CREDIT ARRANGEMENTS AND BORROWINGS

DTE Energy, DTE Electric, and DTE Gas have unsecured revolving credit agreements that can be used for general corporate borrowings, but are intended to provide liquidity support for each of the companies’ commercial paper programs. Borrowings under the revolvers are available at prevailing short-term interest rates. DTE Energy also has other facilities to support letter of credit issuance.

The unsecured revolving credit agreements have historically required DTE Energy, DTE Electric, and DTE Gas to maintain a total funded debt to capitalization ratio of no more than 0.65 to 1. In June 2021, DTE Energy amended its total funded debt to capitalization ratio requirement to no more than 0.70 to 1 starting with the third quarter of 2021 and ending December 2022. The amendment was a result of temporary balance sheet impacts resulting from the separation of DT Midstream on July 1, 2021. In the agreements, "total funded debt" means all indebtedness of each respective company and their consolidated subsidiaries, including finance lease obligations, hedge agreements, and guarantees of third parties’ debt, but excluding contingent obligations, nonrecourse and junior subordinated debt, and certain equity-linked securities and, except for calculations at the end of the second quarter, certain DTE Gas short-term debt. "Capitalization" means the sum of (a) total funded debt plus (b) "consolidated net worth," which is equal to consolidated total equity of each respective company and their consolidated subsidiaries (excluding pension effects under certain FASB statements), as determined in accordance with accounting principles generally accepted in the United States of America. At September 30, 2021, the total funded debt to total capitalization ratios for DTE Energy, DTE Electric, and DTE Gas were 0.66 to 1, 0.51 to 1, and 0.46 to 1, respectively, and were in compliance with this financial covenant.

The availability under these facilities as of September 30, 2021 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured revolving credit facility, expiring April 2025(a)	$	1,500	$	500	$	300	$	2,300
Unsecured Canadian revolving credit facility, expiring May 2023	87		—		—		87
Unsecured letter of credit facility, expiring in February 2023	150		—		—		150
Unsecured letter of credit facility, expiring in July 2023	70		—		—		70
Unsecured letter of credit facility(b)	50		—		—		50
	1,857		500		300		2,657
Amounts outstanding at September 30, 2021
Revolver borrowings	74		—		—		74
Commercial paper issuances	—		159		128		287
Letters of credit	268		—		—		268
	342		159		128		629
Net availability at September 30, 2021	$	1,515	$	341	$	172	$	2,028

_______________________________________

(a)Total availability of $102 million expires in April 2024, including $67 million at DTE Energy, $22 million at DTE Electric, and $13 million at DTE Gas. All other availability expires in April 2025.

(b)Uncommitted letter of credit facility with automatic renewal provision for each July and therefore no expiration.

In conjunction with maintaining certain exchange-traded risk management positions, DTE Energy may be required to post collateral with its clearing agents. DTE Energy has demand financing agreements with its clearing agents, including an agreement for up to $100 million with an indefinite term and an agreement for up to $150 million currently contracted through 2022 and subject to renewal. The $100 million agreement, as amended, also allows for up to $50 million of additional margin financing provided that DTE Energy posts a letter of credit for the incremental amount. Both agreements allow the right of setoff with posted collateral. At September 30, 2021, the capacity under the facilities was $300 million. The amounts outstanding under the agreements were $4 million and $49 million at September 30, 2021 and December 31, 2020, respectively, and were fully offset by the posted collateral.

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Leases

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Leases

LEASES

Lessor

During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.

The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:

	DTE Energy
	September 30, 2021
	(In millions)
2021	$	6
2022	22
2023	22
2024	22
2025	22
2026 and Thereafter	292
Total minimum future lease receipts	386
Residual value of leased pipeline	17
Less unearned income	202
Net investment in finance lease	201
Less current portion	7
	$	194

Interest income recognized under finance leases was $4 million for the three months ended September 30, 2021 and 2020 and $13 million and $12 million for the nine months ended September 30, 2021 and 2020, respectively.

DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Fixed payments	$	13	$	14	$	42	$	43
Variable payments	55		43		90		82
	$	68	$	57	$	132	$	125
Operating revenues	$	26	$	26	$	70	$	74
Other income	42		31		62		51
	$	68	$	57	$	132	$	125

Leases

LEASES

Lessor

During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.

The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:

	DTE Energy
	September 30, 2021
	(In millions)
2021	$	6
2022	22
2023	22
2024	22
2025	22
2026 and Thereafter	292
Total minimum future lease receipts	386
Residual value of leased pipeline	17
Less unearned income	202
Net investment in finance lease	201
Less current portion	7
	$	194

Interest income recognized under finance leases was $4 million for the three months ended September 30, 2021 and 2020 and $13 million and $12 million for the nine months ended September 30, 2021 and 2020, respectively.

DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Fixed payments	$	13	$	14	$	42	$	43
Variable payments	55		43		90		82
	$	68	$	57	$	132	$	125
Operating revenues	$	26	$	26	$	70	$	74
Other income	42		31		62		51
	$	68	$	57	$	132	$	125

Leases

LEASES

Lessor

During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.

The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:

	DTE Energy
	September 30, 2021
	(In millions)
2021	$	6
2022	22
2023	22
2024	22
2025	22
2026 and Thereafter	292
Total minimum future lease receipts	386
Residual value of leased pipeline	17
Less unearned income	202
Net investment in finance lease	201
Less current portion	7
	$	194

Interest income recognized under finance leases was $4 million for the three months ended September 30, 2021 and 2020 and $13 million and $12 million for the nine months ended September 30, 2021 and 2020, respectively.

DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Fixed payments	$	13	$	14	$	42	$	43
Variable payments	55		43		90		82
	$	68	$	57	$	132	$	125
Operating revenues	$	26	$	26	$	70	$	74
Other income	42		31		62		51
	$	68	$	57	$	132	$	125

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Environmental

DTE Electric

Air — DTE Electric is subject to the EPA ozone and fine particulate transport and acid rain regulations that limit power plant emissions of SO2 and NOX. The EPA and the State of Michigan have also issued emission reduction regulations relating to ozone, fine particulate, regional haze, mercury, and other air pollution. These rules have led to controls on fossil-fueled power plants to reduce SO2, NOX, mercury, and other emissions. Additional rulemakings may occur over the next few years which could require additional controls for SO2, NOX, and other hazardous air pollutants.

The EPA proposed revised air quality standards for ground level ozone in November 2014 and specifically requested comments on the form and level of the ozone standards. The standards were finalized in October 2015. The State of Michigan recommended to the EPA in October 2016 which areas of the state are not attaining the new standard. On April 30, 2018, the EPA finalized the State of Michigan's recommended marginal non-attainment designation for southeast Michigan. The State is required to develop and implement a plan to address the southeast Michigan ozone non-attainment area by the end of 2021. The Registrants cannot predict the scope and associated financial impact of the State's plan to address the ozone non-attainment area at this time.

The EPA has implemented regulatory actions under the Clean Air Act to address emissions of GHGs from the utility sector and other sectors of the economy. Among these actions, in 2015 the EPA finalized performance standards for emissions of carbon dioxide from new and existing fossil-fuel fired EGUs. The performance standards for existing EGUs, known as the EPA Clean Power Plan, were challenged by petitioners and stayed by the U.S. Supreme Court in February 2016 pending final review by the courts. On October 10, 2017, the EPA, under a new administration, proposed to rescind the Clean Power Plan, and in August 2018, the EPA proposed revised emission guidelines for GHGs from existing EGUs. On June 19, 2019, the EPA Administrator officially repealed the Clean Power Plan and finalized its replacement, named the ACE rule. The ACE rule was vacated and remanded back to the EPA in a D.C. Circuit Court decision on January 19, 2021. The next steps taken by the EPA with respect to regulation of GHGs from EGUs is uncertain. Regardless of future rules, DTE Energy remains committed for its electric utility operations to reduce carbon emissions 32% by 2023, 50% by 2028, and 80% by 2040 from 2005 carbon emissions levels, and its goal of net zero emissions for its electric utility operations by 2050.

In addition to the GHG standards for existing EGUs, in December 2018, the EPA issued proposed revisions to the carbon dioxide performance standards for new, modified, or reconstructed fossil-fuel fired EGUs. The rule was finalized on January 13, 2021 and immediately challenged. An order vacating the rule was filed by the D.C. Circuit Court of Appeals on April 5, 2021. The carbon standards for new sources are not expected to have a material impact on DTE Electric, since DTE Electric has no plans to build new coal-fired generation and any potential new gas generation will be able to comply with the standards.

Pending or future legislation or other regulatory actions could have a material impact on DTE Electric's operations and financial position and the rates charged to its customers. Impacts include expenditures for environmental equipment beyond what is currently planned, financing costs related to additional capital expenditures, the purchase of emission credits from market sources, higher costs of purchased power, and the retirement of facilities where control equipment is not economical. DTE Electric would seek to recover these incremental costs through increased rates charged to its utility customers, as authorized by the MPSC.

To comply with air pollution requirements, DTE Electric has spent approximately $2.4 billion. DTE Electric does not anticipate additional capital expenditures for air pollution requirements, subject to the results of future rulemakings.

Water — In response to an EPA regulation, DTE Electric was required to examine alternatives for reducing the environmental impacts of the cooling water intake structures at several of its facilities. Based on the results of completed studies and expected future studies, DTE Electric may be required to install technologies to reduce the impacts of the water intake structures. A final rule became effective in October 2014. The final rule requires studies to be completed and submitted as part of the NPDES permit application process to determine the type of technology needed to reduce impacts to fish. DTE Electric has initiated the process of completing the required studies. Final compliance for the installation of any required technology will be determined by the state on a case by case, site specific basis. DTE Electric is currently evaluating the compliance options and working with the State of Michigan on evaluating whether any controls are needed. These evaluations/studies may require modifications to some existing intake structures. It is not possible to quantify the impact of this rule making at this time.

Contaminated and Other Sites — Prior to the construction of major interstate natural gas pipelines, gas for heating and other uses was manufactured locally from processes involving coal, coke, or oil. The facilities, which produced gas, have been designated as MGP sites. DTE Electric conducted remedial investigations at contaminated sites, including three former MGP sites. Cleanup of one of the MGP sites is complete, and the site is closed. The investigations have revealed contamination related to the by-products of gas manufacturing at each MGP site. In addition to the MGP sites, DTE Electric is also in the process of cleaning up other contaminated sites, including the area surrounding an ash landfill, electrical distribution substations, electric generating power plants, and underground and above ground storage tank locations. The findings of these investigations indicated that the estimated cost to remediate these sites is expected to be incurred over the next several years. At September 30, 2021 and December 31, 2020, DTE Electric had $13 million and $10 million, respectively, accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Electric’s financial position and cash flows. DTE Electric believes the likelihood of a material change to the accrued amount is remote based on current knowledge of the conditions at each site.

Coal Combustion Residuals and Effluent Limitations Guidelines — A final EPA rule for the disposal of coal combustion residuals, commonly known as coal ash, became effective in October 2015, and was revised in October 2016, July 2018, September 2020, and November 2020. The rule is based on the continued listing of coal ash as a non-hazardous waste and relies on various self-implementation design and performance standards. DTE Electric owns and operates three permitted engineered coal ash storage facilities to dispose of coal ash from coal-fired power plants and operates a number of smaller impoundments at its power plants subject to certain provisions in the CCR rule. At certain facilities, the rule currently requires ongoing sampling and testing of monitoring wells, compliance with groundwater standards, and the closure of basins at the end of the useful life of the associated power plant.

On September 28, 2020, the CCR rule "A Holistic Approach to Closure Part A: Deadline to Initiate Closure and Enhancing Public Access to Information" became effective and established April 11, 2021 as the new deadline for all unlined impoundments (including units previously classified as "clay-lined") to initiate closure. Additionally, the rule amends certain reporting requirements and CCR website requirements. On November 12, 2020, an additional revision to the CCR Rule "A Holistic Approach to Closure Part B: Alternate Demonstration for Unlined Surface Impoundments" was published in the Federal Register that provides a process to determine if certain unlined impoundments consist of an alternative liner system that may be as protective as the current liners specified in the CCR rule, and therefore may continue to operate. DTE Electric has submitted applications to the EPA that support continued use of all impoundments through their active lives. The forced closure date of April 11, 2021 is effectively delayed while the EPA's review has extended beyond this date.

At the State level, legislation was signed by the Governor in December 2018 and provides for further regulation of the CCR program in Michigan. Additionally, the bill provides the basis of a CCR program that EGLE has submitted to the EPA for approval to fully regulate the CCR program in Michigan in lieu of a Federal permit program.

On April 12, 2017, the EPA granted a petition for reconsideration of the 2015 ELG Rule. The EPA also signed an administrative stay of the 2015 ELG Rule’s compliance deadlines for fly ash transport water, bottom ash transport water, and flue gas desulfurization (FGD) wastewater, among others. On June 6, 2017, the EPA published in the Federal Register a proposed rule (Postponement Rule) to postpone certain applicable deadlines within the 2015 ELG rule. The Postponement Rule was published on September 18, 2017. The Postponement Rule nullified the administrative stay but also extended the earliest compliance deadlines for only FGD wastewater and bottom ash transport water until November 1, 2020 in order for the EPA to propose and finalize a new ruling. On October 13, 2020, the EPA finalized the ELG Reconsideration Rule which revised the regulations from the 2015 ELG rule. The Reconsideration Rule revises requirements for two specific waste streams produced by steam electric power plants: FGD wastewater and bottom ash transport water. The Reconsideration Rule also provides additional compliance opportunities by finalizing low utilization and cessation of coal burning subcategories. The Reconsideration Rule provides new opportunities for DTE Electric to evaluate existing ELG compliance strategies and make any necessary adjustments to ensure full compliance with the ELGs in a cost-effective manner.

In October 2020, the EPA published in the Federal Register the final version of the ELG Reconsideration Rule which updates the 2015 ELG Rule. The Reconsideration Rule re-establishes the technology-based effluent limitations guidelines and standards applicable to FGD wastewater and bottom ash transport water. The EPA set the applicability dates for bottom ash transport water and FGD wastewater retrofits to be "as soon as possible" beginning October 13, 2021 and no later than December 31, 2025.

Compliance schedules for individual facilities and individual waste streams are determined through issuance of new NPDES permits by the State of Michigan. The State of Michigan has issued an NPDES permit for the Belle River power plant establishing compliance deadlines based on the 2020 Reconsideration Rule. The deadline is December 31, 2025 if DTE Electric chooses to comply by installation of new treatment technologies, or December 31, 2028 if DTE Electric chooses to pursue the cessation of coal as their ELG compliance option.

On July 27, 2021, the EPA announced they will revisit some of the compliance requirements that were established in the 2020 Reconsideration Rule and plan to release a new proposed rule in Fall of 2022. The 2020 Reconsideration Rule remains in effect until that time.

On October 11, 2021, in consideration of the deadlines above, DTE Electric submitted the appropriate documentation titled the Notice of Planned Participation (NOPP) to the State of Michigan that formally announced the intent to pursue cessation of coal at the Belle River power plant as their ELG compliance option. No new permits that would require ELG compliance have been issued for other facilities, consequently no compliance timelines have been established.

DTE Electric continues to evaluate compliance strategies, technologies and system designs for both FGD wastewater and bottom ash transport water system to achieve compliance with the EPA rules.

DTE Electric has estimated the impact of the CCR and ELG rules to be $661 million of capital expenditures, including $516 million for 2021 through 2025.

DTE Gas

Air — In June 2020, DTE Energy expanded its net zero goal to include its gas utility operations by committing to reduce greenhouse gas emissions to net zero by 2050 from procurement of natural gas through delivery. As part of DTE Energy's 2050 net zero commitment, DTE Gas launched its CleanVision Natural Gas Balance program in January 2021 that offers customers a way to reduce their carbon footprint using carbon offsets and renewable natural gas. The carbon offset program is focused on protecting Michigan forests that naturally absorb carbon dioxide.

Contaminated and Other Sites — DTE Gas owns or previously owned 14 former MGP sites. Investigations have revealed contamination related to the by-products of gas manufacturing at each site. Cleanup of eight of the MGP sites is complete, and the sites are closed. DTE Gas has also completed partial closure of four additional sites. Cleanup activities associated with the remaining sites will continue over the next several years. The MPSC has established a cost deferral and rate recovery mechanism for investigation and remediation costs incurred at former MGP sites. In addition to the MGP sites, DTE Gas is also in the process of cleaning up other contaminated sites, including gate stations, gas pipeline releases, and underground storage tank locations. As of September 30, 2021 and December 31, 2020, DTE Gas had $24 million accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Gas' financial position and cash flows. DTE Gas anticipates the cost amortization methodology approved by the MPSC, which allows for amortization of the MGP costs over a ten-year period beginning with the year subsequent to the year the MGP costs were incurred, will prevent the associated investigation and remediation costs from having a material adverse impact on DTE Gas' results of operations.

Non-utility

DTE Energy's non-utility businesses are subject to a number of environmental laws and regulations dealing with the protection of the environment from various pollutants.

In March 2019, the EPA issued an FOV to EES Coke, the Michigan coke battery facility that is a wholly-owned subsidiary of DTE Energy, alleging that the 2008 and 2014 permits issued by EGLE did not comply with the Clean Air Act. In September 2020, the EPA issued another FOV alleging EES Coke's 2018 and 2019 SO2 emissions exceeded projections and hence violated non-attainment new source review requirements. EES Coke evaluated the EPA's alleged violations and believes that the permits approved by EGLE complied with the Clean Air Act. EES Coke also responded to the EPA's September 2020 allegations demonstrating its actual emissions are compliant with non-attainment new source review requirements. Discussions with the EPA are ongoing. At the present time, DTE Energy cannot predict the outcome or financial impact of this FOV.

Other

In 2010, the EPA finalized a new one-hour SO2 ambient air quality standard that requires states to submit plans and associated timelines for non-attainment areas that demonstrate attainment with the new SO2 standard in phases. Phase 1 addresses non-attainment areas designated based on ambient monitoring data. Phase 2 addresses non-attainment areas with large sources of SO2 and modeled concentrations exceeding the National Ambient Air Quality Standards for SO2. Phase 3 addresses smaller sources of SO2 with modeled or monitored exceedances of the new SO2 standard.

Michigan's Phase 1 non-attainment area includes DTE Energy facilities in southwest Detroit and areas of Wayne County. Modeling runs by EGLE suggest that emission reductions may be required by significant sources of SO2 emissions in these areas, including DTE Electric power plants and DTE Energy's Michigan coke battery facility. As part Michigan's SIP process, DTE Energy has worked with EGLE to develop air permits reflecting significant SO2 emission reductions that, in combination with other non-DTE Energy sources' emission reduction strategies, will help the state attain the standard and sustain its attainment. The Michigan SIP was completed and submitted to the EPA on May 31, 2016 and supplemented on June 30, 2016. On March 19, 2021, the EPA published in the Federal Register partial approval and partial disapproval of Michigan's Detroit SO2 non-attainment area plan. The partial disapproval does not appear to impact DTE's sources and further discussions are underway with the EPA to finalize the plan. Since several non-DTE Energy sources are also part of the proposed compliance plan, DTE Energy is unable to determine the full impact of any further emissions reductions that may be required from DTE's facilities at this time.

Michigan's Phase 2 non-attainment area includes DTE Electric facilities in St. Clair County. EGLE has not made a final determination on SIP strategy for this area, pending the EPA's review of their clean data determination request. Until agency plans are final, DTE Energy is unable to determine the impacts.

Synthetic Fuel Guarantees

DTE Energy discontinued the operations of its synthetic fuel production facilities throughout the United States as of December 31, 2007. DTE Energy provided certain guarantees and indemnities in conjunction with the sales of interests in its synfuel facilities. The guarantees cover potential commercial, environmental, oil price, and tax-related obligations that will survive until 90 days after expiration of all applicable statutes of limitations. DTE Energy estimates that its maximum potential liability under these guarantees at September 30, 2021 was approximately $400 million. Payment under these guarantees is considered remote.

REF Guarantees

DTE Energy has provided certain guarantees and indemnities in conjunction with the sales of interests in or lease of its REF facilities. The guarantees cover potential commercial, environmental, and tax-related obligations that will survive until 90 days after expiration of all applicable statutes of limitations. DTE Energy estimates that its maximum potential liability under these guarantees at September 30, 2021 was $698 million. Payments under these guarantees are considered remote.

Other Guarantees

In certain limited circumstances, the Registrants enter into contractual guarantees. The Registrants may guarantee another entity’s obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. Finally, the Registrants may provide indirect guarantees for the indebtedness of others. DTE Energy’s guarantees are not individually material with maximum potential payments totaling $40 million at September 30, 2021. Payments under these guarantees are considered remote.

The Registrants are periodically required to obtain performance surety bonds in support of obligations to various governmental entities and other companies in connection with its operations. As of September 30, 2021, DTE Energy had $171 million of performance bonds outstanding, including $120 million for DTE Electric. In the event that such bonds are called for nonperformance, the Registrants would be obligated to reimburse the issuer of the performance bond. The Registrants are released from the performance bonds as the contractual performance is completed and does not believe that a material amount of any currently outstanding performance bonds will be called.

Labor Contracts

There are several bargaining units for DTE Energy subsidiaries' approximate 5,100 represented employees, including DTE Electric's approximately 2,700 represented employees. This represents 50% and 57% of DTE Energy's and DTE Electric's total employees, respectively. Of these represented employees, approximately 16% and 21% have contracts expiring within one year for DTE Energy and DTE Electric, respectively.

Purchase Commitments

Utility capital expenditures, expenditures for non-utility businesses, and contributions to equity method investees will be approximately $3.9 billion and $3.0 billion in 2021 for DTE Energy and DTE Electric, respectively. The Registrants have made certain commitments in connection with the estimated 2021 annual capital expenditures and contributions to equity method investees.

COVID-19 Pandemic

DTE Energy has been actively monitoring the impact of the COVID-19 pandemic on supply chains, markets, counterparties, and customers, and any related impacts on operating costs, customer demand, and recoverability of assets that could materially impact the Registrants' financial results.

In 2021, the COVID-19 pandemic has continued to impact DTE Electric sales volumes. As businesses have maintained certain remote operations, related sales volumes have been lower for commercial and industrial customers and higher for residential customers as compared to historical volumes before the pandemic. This impact contributed to a net reduction in DTE Electric sales, but has been offset by favorable rate mix.

In 2020, COVID-19 also resulted in incremental costs at our utilities related to personal protective equipment and other health and safety-related matters, as well as lower volumes for certain companies within the DTE Vantage segment. For the three and nine months ended September 30, 2021, however, there has not been any significant impact to the Registrants' Consolidated Financial Statements.

In consideration of the above factors and all other current and expected impacts to the Registrants' performance and cash flows resulting from the COVID-19 pandemic, there have been no material adjustments or reserves deemed necessary as of September 30, 2021. The Registrants cannot predict the future impacts of the COVID-19 pandemic on the Consolidated Financial Statements, as developments involving COVID-19 and its related effects on economic and operating conditions remain highly uncertain.

Other Contingencies

The Registrants are involved in certain other legal, regulatory, administrative, and environmental proceedings before various courts, arbitration panels, and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits, inquiries from various regulators, and pending judicial matters. The Registrants cannot predict the final disposition of such proceedings. The Registrants regularly review legal matters and record provisions for claims that they can estimate and are considered probable of loss. The resolution of these pending proceedings is not expected to have a material effect on the Registrants' Consolidated Financial Statements in the periods they are resolved.

For a discussion of contingencies related to regulatory matters and derivatives, see Notes 6 and 9 to the Consolidated Financial Statements, "Regulatory Matters" and "Financial and Other Derivative Instruments," respectively.

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Retirement Benefits and Trusteed Assets

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Retirement Benefits and Trusteed Assets

RETIREMENT BENEFITS AND TRUSTEED ASSETS

The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	27	$	25	$	8	$	7
Interest cost	39		46		12		14
Expected return on plan assets	(84)		(84)		(33)		(32)
Amortization of:
Net actuarial loss	49		43		3		4
Prior service credit	—		—		(5)		(5)
Settlements	—		2		—		—
Net periodic benefit cost (credit)	$	31	$	32	$	(15)	$	(12)

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	81	$	74	$	23	$	20
Interest cost	118		139		35		42
Expected return on plan assets	(254)		(250)		(97)		(96)
Amortization of:
Net actuarial loss	147		129		10		12
Prior service credit	—		—		(15)		(15)
Settlements	—		2		—		—
Net periodic benefit cost (credit)	$	92	$	94	$	(44)	$	(37)

DTE Electric participates in various plans that provide pension and other postretirement benefits for DTE Energy and its affiliates. The plans are primarily sponsored by DTE Energy's subsidiary, DTE Energy Corporate Services, LLC. DTE Electric accounts for its participation in DTE Energy's qualified and non-qualified pension plans by applying multiemployer accounting. DTE Electric accounts for its participation in other postretirement benefit plans by applying multiple-employer accounting. Within multiemployer and multiple-employer plans, participants pool plan assets for investment purposes and to reduce the cost of plan administration. The primary difference between plan types is assets contributed in multiemployer plans can be used to provide benefits for all participating employers, while assets contributed within a multiple-employer plan are restricted for use by the contributing employer. As a result of multiemployer accounting treatment, capitalized costs associated with these plans are reflected in Property, plant, and equipment in DTE Electric's Consolidated Statements of Financial Position. The same capitalized costs are reflected as Regulatory assets and liabilities in DTE Energy's Consolidated Statements of Financial Position. In addition, the service cost and non-service cost components are presented in Operation and maintenance in DTE Electric's Consolidated Statements of Operations. The same non-service cost components are presented in Other (Income) and Deductions — Non-operating retirement benefits, net in DTE Energy's Consolidated Statements of Operations. Plan participants of all plans are solely DTE Energy and affiliate participants.

DTE Energy's subsidiaries are responsible for their share of qualified and non-qualified pension benefit costs. DTE Electric's allocated portion of pension benefit costs included in capital expenditures and operating and maintenance expense was $26 million and $28 million for the three months ended September 30, 2021 and 2020, respectively, and $78 million and $79 million for the nine months ended September 30, 2021 and 2020, respectively. These amounts include recognized contractual termination benefit charges, curtailment gains, and settlement charges.

The following tables detail the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	6	$	5	$	17	$	15
Interest cost	8		11		25		32
Expected return on plan assets	(22)		(21)		(65)		(65)
Amortization of:
Net actuarial loss	3		2		9		8
Prior service credit	(3)		(3)		(10)		(10)
Net periodic benefit credit	$	(8)	$	(6)	$	(24)	$	(20)

Pension and Other Postretirement Contributions

At the discretion of management and depending upon financial market conditions, DTE Energy anticipates making up to $7 million in contributions to the qualified pension plans in 2021. No amounts relate to DTE Electric and no contributions are anticipated for DTE Energy's postretirement benefit plans in 2021.

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Segment and Related Information

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment and Related Information

SEGMENT AND RELATED INFORMATION

DTE Energy sets strategic goals, allocates resources, and evaluates performance based on the following structure:

Electric segment consists principally of DTE Electric, which is engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.3 million residential, commercial, and industrial customers in southeastern Michigan.

Gas segment consists principally of DTE Gas, which is engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million residential, commercial, and industrial customers throughout Michigan and the sale of storage and transportation capacity.

DTE Vantage, formerly the Power and Industrial Projects segment, is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial, and institutional customers, produce reduced emissions fuel, and sell electricity and pipeline-quality gas from renewable energy projects.

Energy Trading consists of energy marketing and trading operations.

Corporate and Other includes various holding company activities, holds certain non-utility debt, and holds certain investments, including funds supporting regional development and economic growth.

DTE Energy completed the separation of DT Midstream on July 1, 2021, which was comprised of the Gas Storage and Pipelines segment and also certain DTE Energy holding company activity within the Corporate and Other segment. Amounts relating to DT Midstream have been classified as discontinued operations, and Gas Storage and Pipelines is no longer a reportable segment of DTE Energy. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information.

The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of tax credits and net operating losses, if applicable. The state and local income tax provisions of the utility subsidiaries are also determined on an individual company basis and recognize the tax benefit of various tax credits and net operating losses, if applicable. The subsidiaries record federal, state, and local income taxes payable to or receivable from DTE Energy based on the federal, state, and local tax provisions of each company.

Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, natural gas sales, and renewable natural gas sales in the following segments:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric	$	17	$	16	$	48	$	46
Gas	3		4		10		12
DTE Vantage	125		134		463		308
Energy Trading	9		9		35		23
Corporate and Other	1		1		2		2
	$	155	$	164	$	558	$	391

Financial data of DTE Energy's business segments follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Utility operations
Electric	$	1,700	$	1,690	$	4,468	$	4,211
Gas	193		173		1,070		964
Operating Revenues — Non-utility operations
Electric	2		3		9		10
DTE Vantage	372		324		1,132		850
Energy Trading	1,602		1,061		4,208		2,714
Corporate and Other	1		1		2		2
Reconciliation and Eliminations(a)	(155)		(172)		(572)		(408)
Total	$	3,715	$	3,080	$	10,317	$	8,343

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(a)Includes $14 million for the nine months ended September 30, 2021 and $8 million and $17 million for the three and nine months ended September 30, 2020, respectively, for eliminations related to DTE Energy's prior Gas Storage and Pipelines segment that remain in continuing operations. Eliminations for these revenues are offset by related cost eliminations and have no impact on DTE Energy net income.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric	$	342	$	398	$	788	$	675
Gas	(30)		(20)		146		102
DTE Vantage	73		47		115		102
Energy Trading	(52)		(28)		(173)		5
Corporate and Other	(275)		(25)		(381)		(40)
Discontinued Operations	(33)		104		106		249
Net Income Attributable to DTE Energy Company	$	25	$	476	$	601	$	1,093

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Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The Consolidated Financial Statements should be read in conjunction with the Combined Notes to Consolidated Financial Statements included in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.

The accompanying Consolidated Financial Statements of the Registrants are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Registrants' estimates.

The Consolidated Financial Statements are unaudited but, in the Registrants' opinions, include all adjustments necessary to present a fair statement of the results for the interim periods. All adjustments are of a normal recurring nature, except as otherwise disclosed in these Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2021.

The information in these combined notes relates to each of the Registrants as noted in the Index of Combined Notes to Consolidated Financial Statements. However, DTE Electric does not make any representation as to information related solely to DTE Energy or the subsidiaries of DTE Energy other than itself.

Certain prior year balances for DTE Electric were reclassified to match the current year's Consolidated Financial Statements presentation.

Separation of DT Midstream

On July 1, 2021, DTE Energy completed the previously announced separation of its natural gas pipeline, storage and gathering non-utility business. Effective with the separation, DTE retains no ownership in the new company, DT Midstream, which was formerly comprised of DTE Energy's Gas Storage and Pipelines segment and also included certain DTE Energy holding company activity within the Corporate and Other segment. Gas Storage and Pipelines is no longer a reportable segment of DTE Energy, and financial results of DT Midstream are presented as Income from discontinued operations, net of taxes on DTE Energy's Consolidated Statements of Operations. Assets and liabilities of DT Midstream are also presented as discontinued operations on DTE Energy's Consolidated Statements of Financial Position. Prior periods have been recast to reflect this presentation.

No adjustments were made to the historical activity within the Consolidated Statements of Comprehensive Income, Consolidated Statements of Cash Flows, or the Consolidated Statements of Changes in Equity. Unless noted otherwise, discussion in the Notes to the Consolidated Financial Statements relate to continuing operations. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information regarding the separation of DT Midstream and discontinued operations.

Principles of Consolidation

Principles of Consolidation

The Registrants consolidate all majority-owned subsidiaries and investments in entities in which they have controlling influence. Non-majority owned investments are accounted for using the equity method when the Registrants are able to significantly influence the operating policies of the investee. When the Registrants do not influence the operating policies of an investee, the equity investment is valued at cost minus any impairments, if applicable. These Consolidated Financial Statements also reflect the Registrants' proportionate interests in certain jointly-owned utility plants. The Registrants eliminate all intercompany balances and transactions.

The Registrants evaluate whether an entity is a VIE whenever reconsideration events occur. The Registrants consolidate VIEs for which they are the primary beneficiary. If a Registrant is not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, a Registrant considers all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. The Registrants perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

During the third quarter of 2021, the Registrants performed reassessments of certain VIEs owned by DT Midstream. Upon the separation of DT Midstream, DTE Energy no longer owns any interest in SGG, owner and operator of certain midstream natural gas assets. Therefore, SGG has been removed from the amounts for DTE Energy's consolidated VIEs in the table below. Additionally, as a result of the separation of DT Midstream, DTE Energy no longer has an equity interest in NEXUS, owner of a 256-mile pipeline which transports shale gas to Ohio, Michigan, and Ontario market centers. DTE Energy has removed its equity investment in NEXUS from the amounts for its non-consolidated VIEs. The Registrants maintain a variable interest in NEXUS relating to DTE Electric's transportation services contract. Assets, liabilities, and earnings related to SGG and NEXUS are included in discontinued operations in the Consolidated Financial Statements.

Legal entities within the DTE Vantage segment enter into long-term contractual arrangements with customers to supply energy-related products or services. The entities are generally designed to pass-through the commodity risk associated with these contracts to the customers, with DTE Energy retaining operational and customer default risk. These entities generally are VIEs and consolidated when DTE Energy is the primary beneficiary. In addition, DTE Energy has interests in certain VIEs through which control of all significant activities is shared with partners, and therefore are generally accounted for under the equity method.

The Registrants hold ownership interests in certain limited partnerships. The limited partnerships include investment funds which support regional development and economic growth, and an operational business providing energy-related products. These entities are generally VIEs as a result of certain characteristics of the limited partnership voting rights. The ownership interests are accounted for under the equity method as the Registrants are not the primary beneficiaries.

DTE Energy has variable interests in VIEs through certain of its long-term purchase and sale contracts. DTE Electric has variable interests in VIEs through certain of its long-term purchase contracts. As of September 30, 2021, the carrying amount of assets and liabilities in DTE Energy's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase and sale contracts are predominantly related to working capital accounts and generally represent the amounts owed by or to DTE Energy for the deliveries associated with the current billing cycle under the contracts. As of September 30, 2021, the carrying amount of assets and liabilities in DTE Electric's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase contracts are predominantly related to working capital accounts and generally represent the amounts owed by DTE Electric for the deliveries associated with the current billing cycle under the contracts. The Registrants have not provided any significant form of financial support associated with these long-term contracts. There is no material potential exposure to loss as a result of DTE Energy's variable interests through these long-term purchase and sale contracts. In addition, there is no material potential exposure to loss as a result of DTE Electric's variable interests through these long-term purchase contracts.

The maximum risk exposure for consolidated VIEs is reflected on the Registrants' Consolidated Statements of Financial Position and, for DTE Energy, in Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies," related to REF guarantees and indemnities. For non-consolidated VIEs, the maximum risk exposure of the Registrants is generally limited to their investment, notes receivable, future funding commitments, and amounts which DTE Energy has guaranteed.

Changes in Accumulated Other Comprehensive Income (Loss)

Changes in Accumulated Other Comprehensive Income (Loss)

Comprehensive income (loss) is the change in common shareholders' equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DTE Energy include changes in benefit obligations, consisting of deferred actuarial losses and prior service costs, unrealized gains and losses from derivatives accounted for as cash flow hedges, and foreign currency translation adjustments. DTE Energy releases income tax effects from accumulated other comprehensive income when the circumstances upon which they are premised cease to exist.

Changes in Accumulated other comprehensive income (loss) are presented in DTE Energy's Consolidated Statements of Changes in Equity and DTE Electric's Consolidated Statements of Changes in Shareholder's Equity.

Cash, Cash Equivalents, and Restricted Cash

Cash, Cash Equivalents, and Restricted Cash

Cash and cash equivalents include cash on hand, cash in banks, and temporary investments purchased with remaining maturities of three months or less. Restricted cash consists of funds held in separate bank accounts to satisfy contractual obligations and guarantee performance. Restricted cash designated for payments within one year is classified as a Current Asset.

Financing Receivables

Financing Receivables

Financing receivables are primarily composed of trade receivables, notes receivable, and unbilled revenue. The Registrants' financing receivables are stated at net realizable value.

The Registrants monitor the credit quality of their financing receivables on a regular basis by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, ratings by credit agencies where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, the Registrants have determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have ranked the counterparty as investment grade. To the extent credit ratings are not available, the Registrants utilize other credit quality indicators to determine the level of risk associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have ranked the counterparty as below investment grade; however, due to favorable information on other credit quality indicators, the Registrants have determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status.

The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through September 30, 2021.

	DTE Energy								DTE Electric
	Year of Origination
	2021		2020		2019 and Prior		Total		2021 and Prior
	(In millions)
Notes receivable
Internal grade 1	$	—	$	—	$	19	$	19	$	14
Internal grade 2	2		100		21		123		3
Internal grade 3	—		—		—		—		—
Total notes receivable(a)	$	2	$	100	$	40	$	142	$	17
Net investment in leases
Net investment in leases, internal grade 1	$	—	$	2	$	39	$	41	$	—
Net investment in leases, internal grade 2	—		159		1		160		—
Total net investment in leases(a)	$	—	$	161	$	40	$	201	$	—

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(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other on the Consolidated Statements of Financial Position.

The allowance for doubtful accounts on accounts receivable for the utility entities is generally calculated using an aging approach that utilizes rates developed in reserve studies. DTE Electric and DTE Gas establish an allowance for uncollectible accounts based on historical losses and management's assessment of existing and future economic conditions, customer trends and other factors. Customer accounts are generally considered delinquent if the amount billed is not received by the due date, which is typically in 21 days, however, factors such as assistance programs may delay aggressive action. DTE Electric and DTE Gas generally assess late payment fees on trade receivables based on past-due terms with customers. Customer accounts are written off when collection efforts have been exhausted. The time period for write-off is 150 days after service has been terminated.

The customer allowance for doubtful accounts for non-utility businesses and other receivables for both utility and non-utility businesses is generally calculated based on specific review of probable future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based upon the specific circumstances of the associated receivable.

Notes receivable for DTE Energy are primarily comprised of finance lease receivables and loans that are included in Notes Receivable and Other current assets on DTE Energy's Consolidated Statements of Financial Position. Notes receivable for DTE Electric are primarily comprised of loans.

Notes receivable are typically considered delinquent when payment is not received for periods ranging from 60 to 120 days. The Registrants cease accruing interest (nonaccrual status), consider a note receivable impaired, and establish an allowance for credit loss when it is probable that all principal and interest amounts due will not be collected in accordance with the contractual terms of the note receivable. In determining the allowance for credit losses for notes receivable, the Registrants consider the historical payment experience and other factors that are expected to have a specific impact on the counterparty's ability to pay including existing and future economic conditions.

Cash payments received on nonaccrual status notes receivable, that do not bring the account contractually current, are first applied to the contractually owed past due interest, with any remainder applied to principal. Accrual of interest is generally resumed when the note receivable becomes contractually current.

Recently Adopted and Recently Issued Pronouncements

Recently Adopted Pronouncements

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.

In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity. The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.

Recently Issued Pronouncements

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting, as amended. The amendments in this update provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. The Registrants presently have various contracts that reference LIBOR and are assessing how this standard may be applied to specific contract modifications.

In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments. The amendments in this update modify lease classification requirements for lessors, providing that lease contracts with variable lease payments that do not depend on a reference index or a rate should be classified as operating leases if they would have been classified as a sales-type or direct financing lease and resulted in the recognition of a selling loss at lease commencement. The ASU is effective for the Registrants for fiscal years beginning after December 15, 2021, and interim periods therein. Early adoption is permitted. The Registrants are currently assessing the impact of this standard on their Consolidated Financial Statements.

Fair Value Measurement

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. The Registrants make certain assumptions they believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Registrants and their counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at September 30, 2021 and December 31, 2020. The Registrants believe they use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Registrants classify fair value balances based on the fair value hierarchy defined as follows:

•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Registrants have the ability to access as of the reporting date.

•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

Nuclear Decommissioning Trusts and Other Investments

Nuclear Decommissioning Trusts and Other Investments

The nuclear decommissioning trusts and other investments hold debt and equity securities directly and indirectly through commingled funds. Exchange-traded debt and equity securities held directly, as well as publicly-traded commingled funds, are valued using quoted market prices in actively traded markets. Non-exchange traded fixed income securities are valued based upon quotations available from brokers or pricing services.

Non-publicly traded commingled funds holding exchange-traded equity or debt securities are valued based on stated NAVs. There are no significant restrictions for these funds and investments may be redeemed with 7 to 65 days notice depending on the fund. There is no intention to sell the investment in these commingled funds.

Private equity and other assets include a diversified group of funds that are classified as NAV assets. These funds primarily invest in limited partnerships, including private equity, private real estate and private credit. Distributions are received through the liquidation of the underlying fund assets over the life of the funds. There are generally no redemption rights. The limited partner must hold the fund for its life or find a third-party buyer, which may need to be approved by the general partner. The funds are established with varied contractual durations generally in the range of 7 years to 12 years. The fund life can often be extended by several years by the general partner, and further extended with the approval of the limited partners. Unfunded commitments related to these investments totaled $155 million and $183 million as of September 30, 2021 and December 31, 2020, respectively.

For pricing the nuclear decommissioning trusts and other investments, a primary price source is identified by asset type, class, or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary source of a given security if the trustee determines that another price source is considered preferable. The Registrants have obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices.

Derivative Assets and Liabilities

Derivative Assets and Liabilities

Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options, and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. The Registrants consider the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time, and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality, and basis differential factors. The Registrants monitor the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. The Registrants have obtained an understanding of how these prices are derived. Additionally, the Registrants selectively corroborate the fair value of their transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period. The Registrants have established a Risk Management Committee whose responsibilities include directly or indirectly ensuring all valuation methods are applied in accordance with predefined policies. The development and maintenance of the Registrants' forward price curves has been assigned to DTE Energy's Risk Management Department, which is separate and distinct from the trading functions within DTE Energy.

Fair Value Transfer

Derivatives are transferred between levels primarily due to changes in the source data used to construct price curves as a result of changes in market liquidity. Transfers in and transfers out are reflected as if they had occurred at the beginning of the period.

Derivatives

The Registrants recognize all derivatives at their fair value as Derivative assets or liabilities on their respective Consolidated Statements of Financial Position unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the derivative gain or loss is deferred in Accumulated other comprehensive income (loss) and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative and hedged item are recognized in earnings each period. For derivatives that do not qualify or are not designated for hedge accounting, changes in fair value are recognized in earnings each period.

The Registrants' primary market risk exposure is associated with commodity prices, credit, and interest rates. The Registrants have risk management policies to monitor and manage market risks. The Registrants use derivative instruments to manage some of the exposure. DTE Energy uses derivative instruments for trading purposes in its Energy Trading segment. Contracts classified as derivative instruments include electricity, natural gas, oil, certain environmental contracts, forwards, futures, options, swaps, and foreign currency exchange contracts. Items not classified as derivatives include natural gas and environmental inventory, pipeline transportation contracts, certain environmental contracts, and natural gas storage assets.

DTE Electric — DTE Electric generates, purchases, distributes, and sells electricity. DTE Electric uses forward contracts to manage changes in the price of electricity and fuel. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Other derivative contracts are MTM and recoverable through the PSCR mechanism when settled. This results in the deferral of unrealized gains and losses as Regulatory assets or liabilities until realized.

DTE Gas — DTE Gas purchases, stores, transports, distributes, and sells natural gas, and buys and sells transportation and storage capacity. DTE Gas has fixed-priced contracts for portions of its expected natural gas supply requirements through March 2024. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Forward transportation and storage contracts are generally not derivatives and are therefore accounted for under the accrual method.

DTE Vantage — This segment manages and operates industrial energy projects, reduced emissions fuel projects, renewable gas recovery, and power generation assets. Primarily fixed-price contracts are used in the marketing and management of the segment assets. These contracts are generally not derivatives and are therefore accounted for under the accrual method.

Energy Trading — Commodity Price Risk — Energy Trading markets and trades electricity, natural gas physical products, and energy financial instruments, and provides energy and asset management services utilizing energy commodity derivative instruments. Forwards, futures, options, and swap agreements are used to manage exposure to the risk of market price and volume fluctuations in its operations. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.

Energy Trading — Foreign Currency Exchange Risk — Energy Trading has foreign currency exchange forward contracts to economically hedge fixed Canadian dollar commitments existing under natural gas and power purchase and sale contracts and natural gas transportation contracts. Energy Trading enters into these contracts to mitigate price volatility with respect to fluctuations of the Canadian dollar relative to the U.S. dollar. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.

Corporate and Other — Interest Rate Risk — DTE Energy may use interest rate swaps, treasury locks, and other derivatives to hedge the risk associated with interest rate market volatility.

Credit Risk — DTE Energy maintains credit policies that significantly minimize overall credit risk. These policies include an evaluation of potential customers’ and counterparties’ financial condition, including the viability of underlying productive assets, credit rating, collateral requirements, or other credit enhancements such as letters of credit or guarantees. DTE Energy generally uses standardized agreements that allow the netting of positive and negative transactions associated with a single counterparty. DTE Energy maintains a provision for credit losses based on factors surrounding the credit risk of its customers, historical trends, and other information. Based on DTE Energy's credit policies and its September 30, 2021 provision for credit losses, DTE Energy’s exposure to counterparty nonperformance is not expected to have a material adverse effect on DTE Energy's Consolidated Financial Statements.

Derivatives, Offsetting Fair Value Amounts

Certain of DTE Energy's derivative positions are subject to netting arrangements which provide for offsetting of asset and liability positions as well as related cash collateral. Such netting arrangements generally do not have restrictions. Under such netting arrangements, DTE Energy offsets the fair value of derivative instruments with cash collateral received or paid for those contracts executed with the same counterparty, which reduces DTE Energy's Total Assets and Liabilities. Cash collateral is allocated between the fair value of derivative instruments and customer accounts receivable and payable with the same counterparty on a pro-rata basis to the extent there is exposure. Any cash collateral remaining, after the exposure is netted to zero, is reflected in Accounts receivable and Accounts payable as collateral paid or received, respectively.

DTE Energy also provides and receives collateral in the form of letters of credit which can be offset against net Derivative assets and liabilities as well as Accounts receivable and payable. DTE Energy had issued letters of credit of $20 million and $7 million outstanding at September 30, 2021 and December 31, 2020, respectively, which could be used to offset net Derivative liabilities. Letters of credit received from third parties which could be used to offset net Derivative assets were $55 million and $9 million at September 30, 2021 and December 31, 2020, respectively. Such balances of letters of credit are excluded from the tables below and are not netted with the recognized assets and liabilities in DTE Energy's Consolidated Statements of Financial Position.

For contracts with certain clearing agents, the fair value of derivative instruments is netted against realized positions with the net balance reflected as either 1) a Derivative asset or liability or 2) an Account receivable or payable. Other than certain clearing agents, Accounts receivable and Accounts payable that are subject to netting arrangements have not been offset against the fair value of Derivative assets and liabilities.

Derivatives, Methods of Accounting

Revenues and energy costs related to trading contracts are presented on a net basis in DTE Energy's Consolidated Statements of Operations. Commodity derivatives used for trading purposes, and financial non-trading commodity derivatives, are accounted for using the MTM method with unrealized and realized gains and losses recorded in Operating Revenues — Non-utility operations. Non-trading physical commodity sale and purchase derivative contracts are generally accounted for using the MTM method with unrealized and realized gains and losses for sales recorded in Operating Revenues — Non-utility operations and purchases recorded in Fuel, purchased power, gas, and other — non-utility.

Income Tax

The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of tax credits and net operating losses, if applicable. The state and local income tax provisions of the utility subsidiaries are also determined on an individual company basis and recognize the tax benefit of various tax credits and net operating losses, if applicable. The subsidiaries record federal, state, and local income taxes payable to or receivable from DTE Energy based on the federal, state, and local tax provisions of each company.

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Organization and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

The following table summarizes the major Consolidated Statements of Financial Position items for consolidated VIEs as of September 30, 2021 and December 31, 2020. All assets and liabilities of a consolidated VIE are presented where it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. VIEs, in which DTE Energy holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below.

Amounts for DTE Energy's consolidated VIEs are as follows:

	September 30, 2021		December 31, 2020
	(In millions)
ASSETS
Cash and cash equivalents	$	23	$	20
Accounts receivable	26		28
Inventories	45		107
Property, plant, and equipment, net	5		14
Notes receivable and other	67		33
	$	166	$	202
LIABILITIES
Accounts payable	$	21	$	22
Short-term borrowings	74		38
Other current and long-term liabilities	2		4
	$	97	$	64

Summary of Amounts for Non-Consolidated Variable Interest Entities

Amounts for DTE Energy's non-consolidated VIEs are as follows:

	September 30, 2021		December 31, 2020
	(In millions)
Investments in equity method investees	$	170	$	159
Notes receivable	$	16	$	21
Future funding commitments	$	3	$	6

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Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Schedule of Other Income

The following is a summary of DTE Energy's Other income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Income from REF entities	$	57	$	43	$	102	$	95
Equity earnings of equity method investees	17		12		31		21
Contract services	6		7		21		20
Allowance for equity funds used during construction	7		6		20		19
Gains from rabbi trust securities(a)	—		2		4		24
Other	3		5		9		9
	$	90	$	75	$	187	$	188

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(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.

The following is a summary of DTE Electric's Other income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Contract services	$	6	$	7	$	21	$	20
Allowance for equity funds used during construction	6		6		18		18
Gains from rabbi trust securities allocated from DTE Energy(a)	—		2		4		24
Other	2		3		9		6
	$	14	$	18	$	52	$	68

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(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.

Schedule of Effective Tax Rates

The interim effective tax rates of the Registrants are as follows:

	Effective Tax Rate
	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
DTE Energy	186	%	5	%	(34)	%	2	%
DTE Electric	12	%	13	%	10	%	12	%

Schedule of Financing Receivables Classified by Internal Grade of Credit Risk

The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through September 30, 2021.

	DTE Energy								DTE Electric
	Year of Origination
	2021		2020		2019 and Prior		Total		2021 and Prior
	(In millions)
Notes receivable
Internal grade 1	$	—	$	—	$	19	$	19	$	14
Internal grade 2	2		100		21		123		3
Internal grade 3	—		—		—		—		—
Total notes receivable(a)	$	2	$	100	$	40	$	142	$	17
Net investment in leases
Net investment in leases, internal grade 1	$	—	$	2	$	39	$	41	$	—
Net investment in leases, internal grade 2	—		159		1		160		—
Total net investment in leases(a)	$	—	$	161	$	40	$	201	$	—

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(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other on the Consolidated Statements of Financial Position.

Schedule of Roll-Forward of Activity for Financing Receivables Credit Loss Reserves

The following tables present a roll-forward of the activity for the Registrants' financing receivables credit loss reserves:

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2021	$	101	$	3	$	104	$	57
Current period provision	41		1		42		27
Write-offs charged against allowance	(92)		(1)		(93)		(58)
Recoveries of amounts previously written off	49		—		49		29
Ending reserve balance, September 30, 2021	$	99	$	3	$	102	$	55

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2020(a)	$	79	$	4	$	83	$	46
Current period provision	102		3		105		61
Write-offs charged against allowance	(130)		(4)		(134)		(80)
Recoveries of amounts previously written off	50		—		50		30
Ending reserve balance, December 31, 2020	$	101	$	3	$	104	$	57

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(a)DTE Energy Trade accounts receivable beginning reserve balance excludes $8 million related to the discontinued operations of DT Midstream. Prospective activity includes only the continuing operations of DTE Energy.

Schedule of Uncollectible Expense

Uncollectible expense for the Registrants is primarily comprised of the current period provision for allowance for doubtful accounts and is summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
DTE Energy	$	7	$	22	$	42	$	72
DTE Electric	10		16		26		42

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Dispositions and Impairments (Tables)

9 Months Ended

Sep. 30, 2021

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations

The table below reflects the financial results of DT Midstream that have been reclassified from continuing operations and included in discontinued operations within the Consolidated Statements of Operations. These results include the impact of tax-related adjustments and all transaction costs related to the separation. General corporate overhead costs have been excluded and no portion of corporate interest costs were allocated to discontinued operations.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Non-utility operations	$	—	$	204	$	405	$	546
Operating Expenses
Cost of gas and other — non-utility	—		6		15		14
Operation and maintenance(a)	30		32		124		80
Depreciation and amortization	—		38		82		110
Taxes other than income	—		3		13		12
Asset (gains) losses and impairments, net	—		(4)		17		(4)
	30		75		251		212
Operating Income (Loss)	(30)		129		154		334
Other (Income) and Deductions
Interest expense	—		29		50		82
Interest income	—		(4)		(4)		(6)
Other income	—		(45)		(62)		(98)
	—		(20)		(16)		(22)
Income (Loss) from Discontinued Operations Before Income Taxes	(30)		149		170		356
Income Tax Expense	3		42		58		99
Income (Loss) from Discontinued Operations, Net of Taxes	(33)		107		112		257
Less: Net Income Attributable to Noncontrolling Interests	—		3		6		8
Net Income (Loss) from Discontinued Operations	$	(33)	$	104	$	106	$	249

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(a)Includes separation transaction costs of $30 million and $59 million for the three and nine months ended September 30, 2021, respectively, for various legal, accounting and other professional services fees. There were no costs incurred in the comparable prior year periods. Total transaction costs of $67 million have been incurred since October 2020.

The table below reflects the major assets and liabilities that were transferred to DT Midstream and presented as discontinued operations in the Consolidated Statements of Financial Position as of December 31, 2020.

	December 31, 2020
	(In millions)
Total Assets of Discontinued Operations
Cash	$	42
Accounts receivable	126
Inventories	8
Other	44
Current assets of DT Midstream	220
Less: Previously affiliated amounts eliminated at DTE Energy	3
Current assets of discontinued operations for DTE Energy	217
Investments in equity method investees	1,691
Net property, plant, and equipment	3,470
Goodwill	473
Intangible assets	2,140
Notes receivable	19
Operating lease right-of-use assets	45
Other	21
Noncurrent assets of discontinued operations for DTE Energy	7,859
Total Assets of Discontinued Operations for DTE Energy	$	8,076
Total Liabilities of Discontinued Operations
Accounts payable	$	39
Operating lease liabilities	17
Short-term borrowings due to DTE Energy(a)	2,913
Other	53
Current liabilities of DT Midstream	3,022
Less: Previously affiliated amounts eliminated at DTE Energy	2,923
Current liabilities of discontinued operations for DTE Energy	99
Deferred income taxes	753
Asset retirement obligations	10
Operating lease liabilities	28
Other	45
Noncurrent liabilities of discontinued operations for DTE Energy	836
Total Liabilities of Discontinued Operations for DTE Energy	$	935

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(a)Short-term borrowings due to DTE Energy resulted in an intercompany note receivable in the Corporate and Other segment at December 31, 2020. The settlement of these borrowings in June 2021 and use of proceeds to redeem DTE Energy long-term debt in the third quarter 2021 has reduced the Total Assets of the Corporate and Other segment in the current period. Other changes in DTE Energy's Total Assets due to the separation of DT Midstream primarily relate to the elimination of Gas Storage and Pipelines segment assets in 2021.

The following table is a summary of significant non-cash items, capital expenditures, and significant financing activities of discontinued operations included in DTE Energy's Consolidated Statements of Cash Flows:

	Nine Months Ended September 30,
	2021		2020
	(In millions)
Operating Activities
Depreciation and amortization	$	82	$	110
Deferred income taxes	57		95
Equity earnings of equity method investees	(59)		(75)
Asset (gains) losses and impairments, net	19		(4)
Investing Activities
Plant and equipment expenditures — non-utility	$	(60)	$	(440)
Financing Activities
Acquisition related deferred payment, excluding accretion	$	—	$	(380)

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Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following is a summary of revenues disaggregated by segment for DTE Energy:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric(a)
Residential	$	885	$	900	$	2,262	$	2,169
Commercial	533		498		1,452		1,313
Industrial	167		157		473		434
Other(b)	117		138		290		305
Total Electric operating revenues	$	1,702	$	1,693	$	4,477	$	4,221
Gas
Gas sales	$	95	$	92	$	726	$	655
End User Transportation	38		34		171		154
Intermediate Transportation	16		15		59		57
Other(b)	44		32		114		98
Total Gas operating revenues	$	193	$	173	$	1,070	$	964
Other segment operating revenues
DTE Vantage	$	372	$	324	$	1,132	$	850
Energy Trading	$	1,602	$	1,061	$	4,208	$	2,714

_______________________________________

(a)Revenues generally represent those of DTE Electric, except $2 million and $3 million of Other revenues related to DTE Sustainable Generation for the three months ended September 30, 2021 and 2020, respectively, and $9 million and $10 million for the nine months ended September 30, 2021 and 2020, respectively.

(b)Includes revenue adjustments related to various regulatory mechanisms.

Revenues included the following which were outside the scope of Topic 606:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric — Other revenues	$	6	$	8	$	14	$	18
Gas — Alternative Revenue Programs	—		—		—		2
Gas — Other revenues	1		2		5		7
DTE Vantage — Leases	26		26		70		74
Energy Trading — Derivatives	1,324		731		3,377		1,835

Summary of Deferred Revenue Activity

The following is a summary of deferred revenue activity:

	DTE Energy
	(In millions)
Beginning Balance, January 1, 2021(a)	$	65
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	79
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(19)
Ending Balance, September 30, 2021	$	125

_______________________________________

(a)Excludes $22 million of deferred revenue related to the discontinued operations of DT Midstream. Prospective activity includes only the continuing operations of DTE Energy.

Deferred Revenue Amounts Expected to be Recognized as Revenue in Future Periods

The following table represents deferred revenue amounts for DTE Energy that are expected to be recognized as revenue in future periods:

	DTE Energy
	(In millions)
2021	$	72
2022	50
2023	1
2024	1
2025	—
2026 and thereafter	1
	$	125

The Registrants expect to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:

	DTE Energy		DTE Electric
	(In millions)
2021	$	41	$	2
2022	308		8
2023	264		7
2024	159		7
2025	80		1
2026 and thereafter	421		—
	$	1,273	$	25

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Common Stock and Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following is a reconciliation of DTE Energy's basic and diluted income per share calculation:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions, except per share amounts)
Basic Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Less: Allocation of earnings to net restricted stock awards	—		1		1		2
	$	58	$	371	$	494	$	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)		104		106		249
Net income available to common shareholders — basic	$	25	$	475	$	600	$	1,091
Average number of common shares outstanding — basic	193		193		193		192
Income from continuing operations	$	0.30	$	1.93	$	2.55	$	4.37
Income (loss) from discontinued operations	(0.17)		0.54		0.55		1.30
Basic Earnings per Common Share	$	0.13	$	2.47	$	3.10	$	5.67
Diluted Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$	58	$	372	$	495	$	844
Less: Allocation of earnings to net restricted stock awards	—		1		1		2
	$	58	$	371	$	494	$	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)		104		106		249
Net income available to common shareholders — diluted	$	25	$	475	$	600	$	1,091
Average number of common shares outstanding — basic	193		193		193		192
Average dilutive equity units, performance share awards, and stock options	1		—		1		1
Average number of common shares outstanding — diluted	194		193		194		193
Income from continuing operations	$	0.30	$	1.92	$	2.55	$	4.37
Income (loss) from discontinued operations	(0.17)		0.54		0.55		1.29
Diluted Earnings per Common Share(a)	$	0.13	$	2.46	$	3.10	$	5.66

_______________________________________

(a)Equity Units excluded from the calculation of diluted EPS were approximately 11.1 million and 10.3 million for the three months ended September 30, 2021 and 2020, respectively, and 11.5 million and 10.3 million for the nine months ended September 30, 2021 and 2020, respectively, as the dilutive stock price threshold was not met.

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Fair Value (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis

The following table presents assets and liabilities for DTE Energy measured and recorded at fair value on a recurring basis:

	September 30, 2021												December 31, 2020
	Level 1		Level 2		Level 3		Other(a)		Netting(b)		Net Balance		Level 1		Level 2		Level 3		Other(a)		Netting(b)		Net Balance
	(In millions)
Assets
Cash equivalents(c)	$	9	$	—	$	—	$	—	$	—	$	9	$	438	$	—	$	—	$	—	$	—	$	438
Nuclear decommissioning trusts
Equity securities	944		—		—		196		—		1,140		947		—		—		222		—		1,169
Fixed income securities	127		429		—		102		—		658		102		371		—		82		—		555
Private equity and other	—		—		—		175		—		175		—		—		—		104		—		104
Cash equivalents	34		—		—		—		—		34		27		—		—		—		—		27
Other investments(d)
Equity securities	61		—		—		—		—		61		55		—		—		—		—		55
Fixed income securities	7		—		—		—		—		7		8		—		—		—		—		8
Cash equivalents	86		—		—		—		—		86		97		—		—		—		—		97
Derivative assets
Commodity contracts(e)
Natural gas	579		146		53		—		(715)		63		99		74		60		—		(156)		77
Electricity	—		707		245		—		(627)		325		—		128		52		—		(120)		60
Environmental & Other	—		598		12		—		(570)		40		—		150		4		—		(135)		19
Total derivative assets	579		1,451		310		—		(1,912)		428		99		352		116		—		(411)		156
Total	$	1,847	$	1,880	$	310	$	473	$	(1,912)	$	2,598	$	1,773	$	723	$	116	$	408	$	(411)	$	2,609
Liabilities
Derivative liabilities
Commodity contracts(e)
Natural gas	$	(425)	$	(297)	$	(333)	$	—	$	664	$	(391)	$	(88)	$	(59)	$	(76)	$	—	$	151	$	(72)
Electricity	—		(576)		(340)		—		614		(302)		—		(126)		(42)		—		125		(43)
Environmental & Other	—		(581)		—		—		570		(11)		—		(137)		—		—		129		(8)
Foreign currency exchange contracts	—		(5)		—		—		—		(5)		—		(5)				—		—		(5)
Total	$	(425)	$	(1,459)	$	(673)	$	—	$	1,848	$	(709)	$	(88)	$	(327)	$	(118)	$	—	$	405	$	(128)
Net Assets (Liabilities) at end of period	$	1,422	$	421	$	(363)	$	473	$	(64)	$	1,889	$	1,685	$	396	$	(2)	$	408	$	(6)	$	2,481
Assets
Current	$	506	$	1,183	$	258	$	—	$	(1,591)	$	356	$	532	$	260	$	92	$	—	$	(330)	$	554
Noncurrent	1,341		697		52		473		(321)		2,242		1,241		463		24		408		(81)		2,055
Total Assets	$	1,847	$	1,880	$	310	$	473	$	(1,912)	$	2,598	$	1,773	$	723	$	116	$	408	$	(411)	$	2,609
Liabilities
Current	$	(409)	$	(1,138)	$	(464)	$	—	$	1,546	$	(465)	$	(84)	$	(223)	$	(79)	$	—	$	318	$	(68)
Noncurrent	(16)		(321)		(209)		—		302		(244)		(4)		(104)		(39)		—		87		(60)
Total Liabilities	$	(425)	$	(1,459)	$	(673)	$	—	$	1,848	$	(709)	$	(88)	$	(327)	$	(118)	$	—	$	405	$	(128)
Net Assets (Liabilities) at end of period	$	1,422	$	421	$	(363)	$	473	$	(64)	$	1,889	$	1,685	$	396	$	(2)	$	408	$	(6)	$	2,481

_______________________________________

(a)Amounts represent assets valued at NAV as a practical expedient for fair value.

(b)Amounts represent the impact of master netting agreements that allow DTE Energy to net gain and loss positions and cash collateral held or placed with the same counterparties.

(c)Amounts consisted of $1 million and $2 million of cash equivalents included in Restricted cash on DTE Energy's Consolidated Statements of Financial Position at September 30, 2021 and December 31, 2020, respectively. All other amounts are included in Cash and cash equivalents on the Consolidated Statements of Financial Position.

(d)Excludes cash surrender value of life insurance investments.

(e)For contracts with a clearing agent, DTE Energy nets all activity across commodities. This can result in some individual commodities having a contra balance.

The following table presents assets for DTE Electric measured and recorded at fair value on a recurring basis as of:

	September 30, 2021										December 31, 2020
	Level 1		Level 2		Level 3		Other(a)		Net Balance		Level 1		Level 2		Level 3		Other(a)		Net Balance
	(In millions)
Assets
Cash equivalents	$	—	$	—	$	—	$	—	$	—	$	4	$	—	$	—	$	—	$	4
Nuclear decommissioning trusts
Equity securities	944		—		—		196		1,140		947		—		—		222		1,169
Fixed income securities	127		429		—		102		658		102		371		—		82		555
Private equity and other	—		—		—		175		175		—		—		—		104		104
Cash equivalents	34		—		—		—		34		27		—		—		—		27
Other investments
Equity securities	18		—		—		—		18		16		—		—		—		16
Cash equivalents	11		—		—		—		11		11		—		—		—		11
Derivative assets — FTRs	—		—		12		—		12		—		—		4		—		4
Total	$	1,134	$	429	$	12	$	473	$	2,048	$	1,107	$	371	$	4	$	408	$	1,890
Assets
Current	$	—	$	—	$	12	$	—	$	12	$	4	$	—	$	4	$	—	$	8
Noncurrent	1,134		429		—		473		2,036		1,103		371		—		408		1,882
Total Assets	$	1,134	$	429	$	12	$	473	$	2,048	$	1,107	$	371	$	4	$	408	$	1,890

_______________________________________

(a)Amounts represent assets valued at NAV as a practical expedient for fair value.

Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Energy:

	Three Months Ended September 30, 2021								Three Months Ended September 30, 2020
	Natural Gas		Electricity		Other		Total		Natural Gas		Electricity		Other		Total
	(In millions)
Net Assets (Liabilities) as of June 30	$	(181)	$	(49)	$	15	$	(215)	$	20	$	16	$	10	$	46
Transfers from Level 3 into Level 2	—		—		—		—		(1)		—		—		(1)
Total gains (losses)
Included in earnings(a)	(162)		(21)		—		(183)		(80)		37		1		(42)
Recorded in Regulatory liabilities	—		—		(1)		(1)		—		—		9		9
Purchases, issuances, and settlements
Settlements	63		(25)		(2)		36		22		(48)		(13)		(39)
Net Assets (Liabilities) as of September 30	$	(280)	$	(95)	$	12	$	(363)	$	(39)	$	5	$	7	$	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30(a)	$	(109)	$	(30)	$	(2)	$	(141)	$	(57)	$	11	$	(1)	$	(47)

_______________________________________

(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.

	Nine Months Ended September 30, 2021								Nine Months Ended September 30, 2020
	Natural Gas		Electricity		Other		Total		Natural Gas		Electricity		Other		Total
	(In millions)
Net Assets (Liabilities) as of December 31	$	(16)	$	10	$	4	$	(2)	$	(15)	$	16	$	3	$	4
Transfers from Level 3 into Level 2	—		—		—		—		(5)		—		—		(5)
Total gains (losses)
Included in earnings(a)	(356)		(5)		—		(361)		(44)		90		(7)		39
Recorded in Regulatory liabilities	—		—		14		14		—		—		21		21
Purchases, issuances, and settlements
Settlements	92		(100)		(6)		(14)		25		(101)		(10)		(86)
Net Assets (Liabilities) as of September 30	$	(280)	$	(95)	$	12	$	(363)	$	(39)	$	5	$	7	$	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30(a)	$	(301)	$	(54)	$	(17)	$	(372)	$	(20)	$	53	$	(17)	$	16
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30	$	—	$	—	$	12	$	12	$	—	$	—	$	7	$	7

_______________________________________

(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Assets as of beginning of period	$	15	$	10	$	4	$	3
Change in fair value recorded in Regulatory liabilities	(1)		9		14		21
Purchases, issuances, and settlements
Settlements	(2)		(12)		(6)		(17)
Net Assets as of September 30	$	12	$	7	$	12	$	7
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30	$	—	$	—	$	12	$	7

Unobservable Inputs Related to Level 3 Assets and Liabilities

The following tables present the unobservable inputs related to DTE Energy's Level 3 assets and liabilities:

	September 30, 2021
Commodity Contracts	Derivative Assets		Derivative Liabilities		Valuation Techniques	Unobservable Input	Range						Weighted Average
	(In millions)
Natural Gas	$	53	$	(333)	Discounted Cash Flow	Forward basis price (per MMBtu)	$	(1.33)	—	$	3.53	/MMBtu	$	(0.04)	/MMBtu
Electricity	$	245	$	(340)	Discounted Cash Flow	Forward basis price (per MWh)	$	(8)	—	$	10	/MWh	$	(1)	/MWh

	December 31, 2020
Commodity Contracts	Derivative Assets		Derivative Liabilities		Valuation Techniques	Unobservable Input	Range						Weighted Average
	(In millions)
Natural Gas	$	60	$	(76)	Discounted Cash Flow	Forward basis price (per MMBtu)	$	(0.86)	—	$	2.50	/MMBtu	$	(0.07)	/MMBtu
Electricity	$	52	$	(42)	Discounted Cash Flow	Forward basis price (per MWh)	$	(9)	—	$	6	/MWh	$	—	/MWh

Carrying Amount of Fair Value of Financial Instruments

The following table presents the carrying amount and fair value of financial instruments for DTE Energy:

	September 30, 2021								December 31, 2020
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(In millions)
Notes receivable(a), excluding lessor finance leases	$	142	$	—	$	—	$	142	$	141	$	—	$	—	$	141
Short-term borrowings	$	361	$	—	$	361	$	—	$	38	$	—	$	38	$	—
Notes payable(b)	$	5	$	—	$	—	$	5	$	19	$	—	$	—	$	19
Long-term debt(c)	$	17,222	$	2,241	$	15,486	$	1,104	$	19,439	$	2,547	$	18,230	$	1,397

_______________________________________

(a)Current portion included in Current Assets — Other on DTE Energy's Consolidated Statements of Financial Position.

(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy's Consolidated Statements of Financial Position.

(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.

The following table presents the carrying amount and fair value of financial instruments for DTE Electric:

	September 30, 2021								December 31, 2020
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(In millions)
Notes receivable(a)	$	17	$	—	$	—	$	17	$	16	$	—	$	—	$	16
Short-term borrowings — affiliates	$	32	$	—	$	—	$	32	$	101	$	—	$	—	$	101
Short-term borrowings — other	$	159	$	—	$	159	$	—	$	—	$	—	$	—	$	—
Notes payable(b)	$	4	$	—	$	—	$	4	$	17	$	—	$	—	$	17
Long-term debt(c)	$	8,906	$	—	$	9,952	$	150	$	8,236	$	—	$	9,579	$	379

_______________________________________

(a)Included in Current Assets — Other on DTE Electric's Consolidated Statements of Financial Position.

(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Electric's Consolidated Statements of Financial Position.

(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.

Fair Value of Nuclear Decommissioning Trust Fund Assets

The following table summarizes DTE Electric's fair value of the nuclear decommissioning trust fund assets:

	September 30, 2021		December 31, 2020
	(In millions)
Fermi 2	$	1,989	$	1,841
Fermi 1	3		3
Low-level radioactive waste	15		11
	$	2,007	$	1,855

Schedule of Realized Gains and Losses and Proceeds from Sale of Securities by Nuclear Decommissioning Trust Funds

The following table sets forth DTE Electric's gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Realized gains	$	21	$	38	$	80	$	172
Realized losses	$	(1)	$	(11)	$	(9)	$	(103)
Proceeds from sale of securities	$	217	$	816	$	854	$	2,054

Fair Value and Unrealized Gains and Losses for Nuclear Decommissioning Trust Funds

The following table sets forth DTE Electric's fair value and unrealized gains and losses for the nuclear decommissioning trust funds:

	September 30, 2021						December 31, 2020
	Fair Value		Unrealized Gains		Unrealized Losses		Fair Value		Unrealized Gains		Unrealized Losses
	(In millions)
Equity securities	$	1,140	$	507	$	(8)	$	1,169	$	481	$	(6)
Fixed income securities	658		24		(5)		555		20		(1)
Private equity and other	175		41		(2)		104		—		—
Cash equivalents	34		—		—		27		—		—
	$	2,007	$	572	$	(15)	$	1,855	$	501	$	(7)

Fair Value of the Fixed Income Securities Held in Nuclear Decommissioning Trust Funds

The following table summarizes the fair value of the fixed income securities held in nuclear decommissioning trust funds by contractual maturity:

	September 30, 2021
	(In millions)
Due within one year	$	11
Due after one through five years	138
Due after five through ten years	112
Due after ten years	295
	$	556

Summary of Gains (Losses) Related to the Trust

The following table summarizes the Registrant's gains (losses) related to the trust:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Gains (losses) related to equity securities	$	(1)	$	2	$	3	$	(4)
Gains (losses) related to fixed income securities	—		—		—		(3)
	$	(1)	$	2	$	3	$	(7)

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Financial and Other Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivative Instruments

The following table presents the fair value of derivative instruments for DTE Energy:

	September 30, 2021				December 31, 2020
	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
	(In millions)
Derivatives designated as hedging instruments
Foreign currency exchange contracts	$	—	$	(3)	$	—	$	(4)
Derivatives not designated as hedging instruments
Commodity contracts
Natural gas	$	778	$	(1,055)	$	233	$	(223)
Electricity	952		(916)		180		(168)
Environmental & Other	610		(581)		154		(137)
Foreign currency exchange contracts	—		(2)		—		(1)
Total derivatives not designated as hedging instruments	$	2,340	$	(2,554)	$	567	$	(529)
Current	$	1,938	$	(2,011)	$	446	$	(386)
Noncurrent	402		(546)		121		(147)
Total derivatives	$	2,340	$	(2,557)	$	567	$	(533)

The following table presents the fair value of derivative instruments for DTE Electric:

	September 30, 2021		December 31, 2020
	(In millions)
FTRs — Other current assets	$	12	$	4
Total derivatives not designated as hedging instruments	$	12	$	4

Offsetting Assets

The following table presents net cash collateral offsetting arrangements for DTE Energy:

	September 30, 2021		December 31, 2020
	(In millions)
Cash collateral netted against Derivative assets	$	(122)	$	(12)
Cash collateral netted against Derivative liabilities	58		6
Cash collateral recorded in Accounts receivable(a)	66		14
Cash collateral recorded in Accounts payable(a)	(8)		(1)
Total net cash collateral posted (received)	$	(6)	$	7

_______________________________________

(a)Amounts are recorded net by counterparty.

The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:

	September 30, 2021						December 31, 2020
	Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position		Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
	(In millions)
Derivative assets
Commodity contracts
Natural gas	$	778	$	(715)	$	63	$	233	$	(156)	$	77
Electricity	952		(627)		325		180		(120)		60
Environmental & Other	610		(570)		40		154		(135)		19
Total derivative assets	$	2,340	$	(1,912)	$	428	$	567	$	(411)	$	156
Derivative liabilities
Commodity contracts
Natural gas	$	(1,055)	$	664	$	(391)	$	(223)	$	151	$	(72)
Electricity	(916)		614		(302)		(168)		125		(43)
Environmental & Other	(581)		570		(11)		(137)		129		(8)
Foreign currency exchange contracts	(5)		—		(5)		(5)		—		(5)
Total derivative liabilities	$	(2,557)	$	1,848	$	(709)	$	(533)	$	405	$	(128)

Offsetting Liabilities

The following table presents net cash collateral offsetting arrangements for DTE Energy:

	September 30, 2021		December 31, 2020
	(In millions)
Cash collateral netted against Derivative assets	$	(122)	$	(12)
Cash collateral netted against Derivative liabilities	58		6
Cash collateral recorded in Accounts receivable(a)	66		14
Cash collateral recorded in Accounts payable(a)	(8)		(1)
Total net cash collateral posted (received)	$	(6)	$	7

_______________________________________

(a)Amounts are recorded net by counterparty.

The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:

	September 30, 2021						December 31, 2020
	Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position		Gross Amounts of Recognized Assets (Liabilities)		Gross Amounts Offset in the Consolidated Statements of Financial Position		Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
	(In millions)
Derivative assets
Commodity contracts
Natural gas	$	778	$	(715)	$	63	$	233	$	(156)	$	77
Electricity	952		(627)		325		180		(120)		60
Environmental & Other	610		(570)		40		154		(135)		19
Total derivative assets	$	2,340	$	(1,912)	$	428	$	567	$	(411)	$	156
Derivative liabilities
Commodity contracts
Natural gas	$	(1,055)	$	664	$	(391)	$	(223)	$	151	$	(72)
Electricity	(916)		614		(302)		(168)		125		(43)
Environmental & Other	(581)		570		(11)		(137)		129		(8)
Foreign currency exchange contracts	(5)		—		(5)		(5)		—		(5)
Total derivative liabilities	$	(2,557)	$	1,848	$	(709)	$	(533)	$	405	$	(128)

Netting Offsets of Derivative Assets and Liabilities Reconciliation to the Statements of Financial Position

The following table presents the netting offsets of Derivative assets and liabilities showing the reconciliation of derivative instruments to DTE Energy's Consolidated Statements of Financial Position:

	September 30, 2021								December 31, 2020
	Derivative Assets				Derivative Liabilities				Derivative Assets				Derivative Liabilities
	Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
	(In millions)
Total fair value of derivatives	$	1,938	$	402	$	(2,011)	$	(546)	$	446	$	121	$	(386)	$	(147)
Counterparty netting	(1,498)		(292)		1,498		292		(318)		(81)		318		81
Collateral adjustment	(93)		(29)		48		10		(12)		—		—		6
Total derivatives as reported	$	347	$	81	$	(465)	$	(244)	$	116	$	40	$	(68)	$	(60)

Gain (Loss) Recognized in Income on Derivatives

The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations is as follows:

	Location of Gain (Loss) Recognized in Income on Derivatives	Gain (Loss) Recognized in Income on Derivatives for the Three Months Ended September 30,				Gain (Loss) Recognized in Income on Derivatives for the Nine Months Ended September 30,
		2021		2020		2021		2020
		(In millions)
Commodity contracts
Natural gas	Operating Revenues — Non-utility operations	$	(214)	$	(27)	$	(371)	$	(63)
Natural gas	Fuel, purchased power, gas, and other — non-utility	63		(51)		(16)		28
Electricity	Operating Revenues — Non-utility operations	68		33		143		75
Environmental & Other	Operating Revenues — Non-utility operations	3		2		(36)		(40)
Foreign currency exchange contracts	Operating Revenues — Non-utility operations	2		(2)		(1)		—
Total		$	(78)	$	(45)	$	(281)	$	—

Volume of Commodity Contracts

The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of September 30, 2021:

Commodity	Number of Units
Natural gas (MMBtu)	2,096,409,912
Electricity (MWh)	29,383,562
Foreign currency exchange ($ CAD)	119,281,865
Renewable Energy Certificates (MWh)	8,387,594
Carbon emissions (Metric Tons)	48,343,793

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Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Debt Issuances

In 2021, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	March	Mortgage bonds(a)	1.90%	2028	$	575
DTE Electric	March	Mortgage bonds(a)	3.25%	2051	425
DT Midstream	June	Senior notes(b)	4.125%	2029	1,100
DT Midstream	June	Senior notes(b)	4.375%	2031	1,000
DT Midstream	June	Term loan facility(b)	Variable	2028	1,000
					$	4,100

_______________________________________

(a)Bonds were issued as Green Bonds and the proceeds will be used to finance qualified expenditures for solar and wind energy, payments under power purchase agreements for solar and wind energy, and energy optimization programs.

(b)Proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. The debt was transferred to DT Midstream upon its separation on July 1, 2021. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information and to the Debt Redemptions section below for DTE Energy's use of the proceeds received from DT Midstream.

Schedule of Debt Redemptions

In 2021, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	April	Mortgage bonds	3.90%	2021	$	250
DTE Electric	May	Mortgage bonds	7.00%	2021	33
DTE Energy	June	Junior subordinated debentures(a)	5.375%	2076	300
DTE Energy	July	Senior notes	3.30%	2022	300
DTE Energy	July	Senior notes	2.60%	2022	300
DTE Energy	July	Senior notes	3.70%	2023	600
DTE Energy	July	Senior notes	3.85%	2023	135
DTE Energy	July	Senior notes	3.50%	2024	350
DTE Energy	July	Senior notes	3.80%	2027	350
DTE Energy	July	Senior notes	3.40%	2029	21
DTE Energy	July	Senior notes	6.375%	2033	191
DTE Energy	August	Senior notes	3.85%	2023	165
DTE Energy	August	Senior notes	6.375%	2033	209
DTE Electric	August	Mortgage bonds	6.90%	2021	38
					$	3,242

_______________________________________

(a)Early redemption resulted in a loss on extinguishment of debt of $8 million relating to the write-off of unamortized issuance costs.

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Short-Term Credit Arrangements and Borrowings (Tables)

9 Months Ended

Sep. 30, 2021

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under these facilities as of September 30, 2021 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured revolving credit facility, expiring April 2025(a)	$	1,500	$	500	$	300	$	2,300
Unsecured Canadian revolving credit facility, expiring May 2023	87		—		—		87
Unsecured letter of credit facility, expiring in February 2023	150		—		—		150
Unsecured letter of credit facility, expiring in July 2023	70		—		—		70
Unsecured letter of credit facility(b)	50		—		—		50
	1,857		500		300		2,657
Amounts outstanding at September 30, 2021
Revolver borrowings	74		—		—		74
Commercial paper issuances	—		159		128		287
Letters of credit	268		—		—		268
	342		159		128		629
Net availability at September 30, 2021	$	1,515	$	341	$	172	$	2,028

_______________________________________

(a)Total availability of $102 million expires in April 2024, including $67 million at DTE Energy, $22 million at DTE Electric, and $13 million at DTE Gas. All other availability expires in April 2025.

(b)Uncommitted letter of credit facility with automatic renewal provision for each July and therefore no expiration.

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Leases (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Components of Net Investment in Finance Leases

The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:

	DTE Energy
	September 30, 2021
	(In millions)
2021	$	6
2022	22
2023	22
2024	22
2025	22
2026 and Thereafter	292
Total minimum future lease receipts	386
Residual value of leased pipeline	17
Less unearned income	202
Net investment in finance lease	201
Less current portion	7
	$	194

Schedule of Lease Income Associated with Operating Leases

DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Fixed payments	$	13	$	14	$	42	$	43
Variable payments	55		43		90		82
	$	68	$	57	$	132	$	125
Operating revenues	$	26	$	26	$	70	$	74
Other income	42		31		62		51
	$	68	$	57	$	132	$	125

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Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Costs (Credits)

The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	27	$	25	$	8	$	7
Interest cost	39		46		12		14
Expected return on plan assets	(84)		(84)		(33)		(32)
Amortization of:
Net actuarial loss	49		43		3		4
Prior service credit	—		—		(5)		(5)
Settlements	—		2		—		—
Net periodic benefit cost (credit)	$	31	$	32	$	(15)	$	(12)

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	81	$	74	$	23	$	20
Interest cost	118		139		35		42
Expected return on plan assets	(254)		(250)		(97)		(96)
Amortization of:
Net actuarial loss	147		129		10		12
Prior service credit	—		—		(15)		(15)
Settlements	—		2		—		—
Net periodic benefit cost (credit)	$	92	$	94	$	(44)	$	(37)

The following tables detail the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Service cost	$	6	$	5	$	17	$	15
Interest cost	8		11		25		32
Expected return on plan assets	(22)		(21)		(65)		(65)
Amortization of:
Net actuarial loss	3		2		9		8
Prior service credit	(3)		(3)		(10)		(10)
Net periodic benefit credit	$	(8)	$	(6)	$	(24)	$	(20)

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Segment and Related Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Financial Data of Business Segments

Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, natural gas sales, and renewable natural gas sales in the following segments:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Electric	$	17	$	16	$	48	$	46
Gas	3		4		10		12
DTE Vantage	125		134		463		308
Energy Trading	9		9		35		23
Corporate and Other	1		1		2		2
	$	155	$	164	$	558	$	391

Financial data of DTE Energy's business segments follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Operating Revenues — Utility operations
Electric	$	1,700	$	1,690	$	4,468	$	4,211
Gas	193		173		1,070		964
Operating Revenues — Non-utility operations
Electric	2		3		9		10
DTE Vantage	372		324		1,132		850
Energy Trading	1,602		1,061		4,208		2,714
Corporate and Other	1		1		2		2
Reconciliation and Eliminations(a)	(155)		(172)		(572)		(408)
Total	$	3,715	$	3,080	$	10,317	$	8,343

_______________________________________

(a)Includes $14 million for the nine months ended September 30, 2021 and $8 million and $17 million for the three and nine months ended September 30, 2020, respectively, for eliminations related to DTE Energy's prior Gas Storage and Pipelines segment that remain in continuing operations. Eliminations for these revenues are offset by related cost eliminations and have no impact on DTE Energy net income.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(In millions)
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric	$	342	$	398	$	788	$	675
Gas	(30)		(20)		146		102
DTE Vantage	73		47		115		102
Energy Trading	(52)		(28)		(173)		5
Corporate and Other	(275)		(25)		(381)		(40)
Discontinued Operations	(33)		104		106		249
Net Income Attributable to DTE Energy Company	$	25	$	476	$	601	$	1,093

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Organization and Basis of Presentation (Details Textuals) customer in Millions, $ in Millions	Sep. 30, 2021 USD ($) customer
Variable Interest Entity [Line Items]
Number of electric utility customers | customer	2.3
Number of gas utility customers | customer	1.3
Material potential exposure | $	$ 0
DTE Electric
Variable Interest Entity [Line Items]
Material potential exposure | $	$ 0

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Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 54	$ 472
Accounts receivable	1,522	1,542
Property, plant, and equipment, net	26,157	24,499
Total Assets	39,435	45,496
LIABILITIES
Accounts payable	1,365	1,000
Short-term borrowings	361	38
Variable interest entity, primary beneficiary
ASSETS
Cash and cash equivalents	23	20
Accounts receivable	26	28
Inventories	45	107
Property, plant, and equipment, net	5	14
Notes receivable and other	67	33
Total Assets	166	202
LIABILITIES
Accounts payable	21	22
Short-term borrowings	74	38
Other current and long-term liabilities	2	4
Total liabilities	$ 97	$ 64

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Organization and Basis of Presentation (Non-Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Investments in equity method investees	$ 186	$ 177
Notes receivable	304	261
Variable interest entity, non-consolidated
Variable Interest Entity [Line Items]
Investments in equity method investees	170	159
Notes receivable	16	21
Future funding commitments	$ 3	$ 6

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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Other Nonoperating Income, by Component [Line Items]
Income from REF entities	$ 57	$ 43	$ 102	$ 95
Equity earnings of equity method investees	17	12	31	21
Contract services	6	7	21	20
Allowance for equity funds used during construction	7	6	20	19
Gains from rabbi trust securities	0	2	4	24
Other	3	5	9	9
Total other income	90	75	187	188
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Contract services	6	7	21	20
Allowance for equity funds used during construction	6	6	18	18
Gains from rabbi trust securities	0	2	4	24
Other	2	3	9	6
Total other income	$ 14	$ 18	$ 52	$ 68

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Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Income Taxes [Line Items]
Effective Tax Rate	186.00%	5.00%	(34.00%)	2.00%
DTE Electric
Schedule of Income Taxes [Line Items]
Effective Tax Rate	12.00%	13.00%	10.00%	12.00%

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Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Reduction in accumulated other comprehensive loss due to the Separation of DT Midstream	$ (3,999)
Effective tax rate increase (decrease)	181.00%		(36.00%)
Effective tax rate increase (decrease) due to deferred tax remeasurement	133.00%		(23.00%)
Effective tax rate increase (decrease) due to annual production tax credits	51.00%		(13.00%)
Effective tax rate increase (decrease) due to amortization of TCJA regulatory liability	35.00%		(9.00%)
Effective tax rate increase (decrease) due to valuation allowance	(29.00%)		4.00%
Effective tax rate increase (decrease) due to deferred intercompany gain	(13.00%)		2.00%
Effective tax rate increase (decrease) due to net operating losses due to the CARES Act			4.00%
Effective tax rate increase (decrease) due to West Virginia tax law change			2.00%
Deferred tax expense for valuation allowance established	$ 18		$ 18
Deferred tax benefit for deferred tax remeasurement	85		85
Deferred tax expense for deferred intercompany gain recognized	9		9
Unrecognized compensation cost	76		$ 76
Recognition period (in years)			1 year 4 months 24 days
Specific review of probable future collections based on receivable balances, threshold duration			30 days
Past due
Significant Accounting Policies [Line Items]
Financing receivables	$ 0		$ 0
Minimum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period			60 days
Maximum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period			120 days
DTE Electric and DTE Gas
Significant Accounting Policies [Line Items]
Receivables due date			21 days
Threshold period past due for write-off of trade accounts receivable			150 days
DTE Electric
Significant Accounting Policies [Line Items]
Effective tax rate increase (decrease)	(1.00%)		(2.00%)
Effective tax rate increase (decrease) due to annual production tax credits			(1.00%)
Effective tax rate increase (decrease) due to amortization of TCJA regulatory liability			(1.00%)
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	$ 11		$ 11		$ 8
Allocated costs	10	$ 12	$ 35	$ 28
Accumulated Other Comprehensive Loss
Significant Accounting Policies [Line Items]
Reduction in accumulated other comprehensive loss due to the Separation of DT Midstream	$ 10

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Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Notes receivable
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 2
2020	100
2019 and Prior	40
Total	142
Notes receivable | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	17
Notes receivable | Internal grade 1
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019 and Prior	19
Total	19
Notes receivable | Internal grade 1 | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	14
Notes receivable | Internal grade 2
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2
2020	100
2019 and Prior	21
Total	123
Notes receivable | Internal grade 2 | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3
Notes receivable | Internal grade 3
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019 and Prior	0
Total	0
Notes receivable | Internal grade 3 | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0
Net investment in leases
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	161
2019 and Prior	40
Total	201
Net investment in leases | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0
Net investment in leases | Internal grade 1
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	2
2019 and Prior	39
Total	41
Net investment in leases | Internal grade 1 | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0
Net investment in leases | Internal grade 2
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	159
2019 and Prior	1
Total	160
Net investment in leases | Internal grade 2 | DTE Electric
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0

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Significant Accounting Policies (Roll-Forward of Activity for Financing Receivables Credit Loss Reserves) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 104	$ 83
Current period provision	42	105
Write-offs charged against allowance	(93)	(134)
Recoveries of amounts previously written off	49	50
Ending balance	102	104
DTE Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	57	46
Current period provision	27	61
Write-offs charged against allowance	(58)	(80)
Recoveries of amounts previously written off	29	30
Ending balance	55	57
Trade accounts receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	101	79
Current period provision	41	102
Write-offs charged against allowance	(92)	(130)
Recoveries of amounts previously written off	49	50
Ending balance	99	101
Trade accounts receivable | Discontinued operations, spinoff | DT Midstream
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Trade accounts receivable reserve related to discontinued operations			$ 8
Other receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	4
Current period provision	1	3
Write-offs charged against allowance	(1)	(4)
Recoveries of amounts previously written off	0	0
Ending balance	$ 3	$ 3

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Significant Accounting Policies (Uncollectible Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Uncollectible expense	$ 7	$ 22	$ 42	$ 72
DTE Electric
Accounts, Notes, Loans and Financing Receivable [Line Items]
Uncollectible expense	$ 10	$ 16	$ 26	$ 42

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Dispositions and Impairments (Details Textuals)		1 Months Ended	2 Months Ended	3 Months Ended	9 Months Ended
	Jul. 01, 2021 USD ($) shares	Jun. 30, 2021 USD ($)	Aug. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt issued				$ 4,100,000,000	$ 4,100,000,000
Redemption of long-term debt			$ 2,600,000,000		3,242,000,000	$ 682,000,000
Net assets of DT Midstream				3,999,000,000
DTE Vantage
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					27,000,000
DTE Vantage | Property, plant and equipment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets held for use					18,000,000
DTE Vantage | Other noncurrent assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets held for use					9,000,000
DT Midstream | Discontinued operations, spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Assets of Discontinued Operations for DTE Energy				0	0		$ 8,076,000,000
Total Liabilities of Discontinued Operations for DTE Energy				0	$ 0		$ 935,000,000
Net assets of DT Midstream	$ 4,000,000,000
Maximum | DT Midstream | Discontinued operations, spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition Services Agreement period	24 months
Senior Notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Redemption of long-term debt				$ 2,600,000,000
DT Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution of shares (in shares) | shares	96,732,466
Share distribution ratio	0.5
Discount and debt issuance costs		$ 53,000,000
Cash payment for dividend to DTE Energy		501,000,000
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt issued		1,000,000,000
DT Midstream | Senior Notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt issued		2,100,000,000
DT Midstream | Affiliates
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash payment for short-term borrowings due to DTE Energy		2,537,000,000
Net cash payment for accounts receivable due from and accounts payable due to DTE Energy		$ 9,000,000

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Dispositions and Impairments (Financial Results That Have Been Reclassified from Continuing Operations and Included in Discontinued Operations) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Other (Income) and Deductions
Income (Loss) from Discontinued Operations, Net of Taxes	$ (33,000,000)	$ 107,000,000	$ 112,000,000	$ 257,000,000
Less: Net Income Attributable to Noncontrolling Interests	0	3,000,000	6,000,000	8,000,000
Net Income (Loss) from Discontinued Operations	(33,000,000)	104,000,000	106,000,000	249,000,000
Transaction costs	30,000,000	0	59,000,000	0	$ 67,000,000
DT Midstream | Discontinued operations, spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues — Non-utility operations	0	204,000,000	405,000,000	546,000,000
Operating Expenses
Cost of gas and other — non-utility	0	6,000,000	15,000,000	14,000,000
Operation and maintenance	30,000,000	32,000,000	124,000,000	80,000,000
Depreciation and amortization	0	38,000,000	82,000,000	110,000,000
Taxes other than income	0	3,000,000	13,000,000	12,000,000
Asset (gains) losses and impairments, net	0	(4,000,000)	17,000,000	(4,000,000)
Operating Expenses	30,000,000	75,000,000	251,000,000	212,000,000
Operating Income (Loss)	(30,000,000)	129,000,000	154,000,000	334,000,000
Other (Income) and Deductions
Interest expense	0	29,000,000	50,000,000	82,000,000
Interest income	0	(4,000,000)	(4,000,000)	(6,000,000)
Other income	0	(45,000,000)	(62,000,000)	(98,000,000)
Other (Income) and Deductions	0	(20,000,000)	(16,000,000)	(22,000,000)
Income (Loss) from Discontinued Operations Before Income Taxes	(30,000,000)	149,000,000	170,000,000	356,000,000
Income Tax Expense	3,000,000	42,000,000	58,000,000	99,000,000
Income (Loss) from Discontinued Operations, Net of Taxes	(33,000,000)	107,000,000	112,000,000	257,000,000
Less: Net Income Attributable to Noncontrolling Interests	0	3,000,000	6,000,000	8,000,000
Net Income (Loss) from Discontinued Operations	$ (33,000,000)	$ 104,000,000	$ 106,000,000	$ 249,000,000

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Dispositions and Impairments (Major Classes of Assets and Liabilities Transferred and Presented as Discontinued Operations) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Total Assets of Discontinued Operations
Current assets of discontinued operations for DTE Energy	$ 0	$ 217,000,000
Noncurrent assets of discontinued operations for DTE Energy	0	7,859,000,000
Total Liabilities of Discontinued Operations
Current liabilities of discontinued operations for DTE Energy	0	99,000,000
Noncurrent liabilities of discontinued operations for DTE Energy	0	836,000,000
Discontinued operations, spinoff | DT Midstream
Discontinued Operations and Disposal Groups [Abstract]
Cash		42,000,000
Total Assets of Discontinued Operations
Cash		42,000,000
Accounts receivable		126,000,000
Inventories		8,000,000
Other		44,000,000
Current assets of DT Midstream		220,000,000
Less: Previously affiliated amounts eliminated at DTE Energy		3,000,000
Current assets of discontinued operations for DTE Energy		217,000,000
Investments in equity method investees		1,691,000,000
Net property, plant, and equipment		3,470,000,000
Goodwill		473,000,000
Intangible assets		2,140,000,000
Notes receivable		19,000,000
Operating lease right-of-use assets		45,000,000
Other		21,000,000
Noncurrent assets of discontinued operations for DTE Energy		7,859,000,000
Total Assets of Discontinued Operations for DTE Energy	0	8,076,000,000
Total Liabilities of Discontinued Operations
Accounts payable		39,000,000
Operating lease liabilities		17,000,000
Short-term borrowings due to DTE Energy		2,913,000,000
Other		53,000,000
Current liabilities of DT Midstream		3,022,000,000
Less: Previously affiliated amounts eliminated at DTE Energy		2,923,000,000
Current liabilities of discontinued operations for DTE Energy		99,000,000
Deferred income taxes		753,000,000
Asset retirement obligations		10,000,000
Operating lease liabilities		28,000,000
Other		45,000,000
Noncurrent liabilities of discontinued operations for DTE Energy		836,000,000
Total Liabilities of Discontinued Operations for DTE Energy	$ 0	$ 935,000,000

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Dispositions and Impairments (Significant Non-cash Items, Capital Expenditures, and Significant Financing Activities of Discontinued Operations) (Details) - DT Midstream - Discontinued operations, spinoff - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Depreciation and amortization	$ 82	$ 110
Deferred income taxes	57	95
Equity earnings of equity method investees	(59)	(75)
Asset (gains) losses and impairments, net	19	(4)
Investing Activities
Plant and equipment expenditures — non-utility	(60)	(440)
Financing Activities
Acquisition related deferred payment, excluding accretion	$ 0	$ (380)

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Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,715	$ 3,080	$ 10,317	$ 8,343
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,702	1,693	4,477	4,221
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	885	900	2,262	2,169
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	533	498	1,452	1,313
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	167	157	473	434
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	117	138	290	305
Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	2	3	9	10
Gas
Disaggregation of Revenue [Line Items]
Revenues	193	173	1,070	964
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	44	32	114	98
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	95	92	726	655
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	38	34	171	154
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	16	15	59	57
DTE Vantage
Disaggregation of Revenue [Line Items]
Revenues	372	324	1,132	850
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	$ 1,602	$ 1,061	$ 4,208	$ 2,714

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Revenue (Revenues Outside the Scope of Topic 606) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Leases	$ 68	$ 57	$ 132	$ 125
Electric
Disaggregation of Revenue [Line Items]
Other revenues	6	8	14	18
Gas
Disaggregation of Revenue [Line Items]
Other revenues	1	2	5	7
Alternative Revenue Program	0	0	0	2
DTE Vantage
Disaggregation of Revenue [Line Items]
Leases	26	26	70	74
Energy Trading
Disaggregation of Revenue [Line Items]
Derivatives	$ 1,324	$ 731	$ 3,377	$ 1,835

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Revenue (Deferred Revenue Activity) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Contract Liability [Roll Forward]
Beginning Balance	$ 65
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	79
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(19)
Ending Balance	$ 125
Discontinued operations, spinoff | DT Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred revenue		$ 22

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Revenue (Expected Recognition of Deferred Revenue) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 125
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 72
Remaining performance obligation, expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 50
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 0
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction

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Revenue (Expected Timing of Performance Obligation Satisfaction) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 125
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 72
Remaining performance obligation, expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 50
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 0
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,273
Fixed-price Contract | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	25
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 41
Remaining performance obligation, expected timing of satisfaction	3 months
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 2
Remaining performance obligation, expected timing of satisfaction	3 months
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 308
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 8
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 264
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 7
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 159
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 7
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 80
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1
Remaining performance obligation, expected timing of satisfaction	1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 421
Remaining performance obligation, expected timing of satisfaction
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | DTE Electric
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 0
Remaining performance obligation, expected timing of satisfaction

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Regulatory Matters (Details Textuals) - MPSC - USD ($) $ in Millions	Feb. 12, 2021	Aug. 31, 2021	Jun. 23, 2021	Mar. 26, 2021	Jul. 09, 2020
DTE Electric
Public Utilities, General Disclosures [Line Items]
Regulatory liability for non-plant-related accumulated deferred income tax balances that resulted from the TCJA, accelerated amortization approved					$ 102
Requested securitization of qualified costs				$ 184
Authorized issuance of securitization bonds of qualified costs, maximum			$ 236
DTE Electric | Tree Trim Costs
Public Utilities, General Disclosures [Line Items]
Requested regulatory liability		$ 70
DTE Gas | 2021 Gas Rate Case Filing
Public Utilities, General Disclosures [Line Items]
Requested rate increase	$ 195
Return on equity percent	9.90%
Return on equity requested percent	10.25%

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Common Stock and Earnings Per Share (Basic and Diluted Income Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$ 58	$ 372	$ 495	$ 844
Less: Allocation of earnings to net restricted stock awards	0	1	1	2
Net income from continuing operations available to common shareholders — basic	58	371	494	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)	104	106	249
Net income available to common shareholders — basic	$ 25	$ 475	$ 600	$ 1,091
Average number of common shares outstanding — basic (in shares)	193.0	193.0	193.0	192.0
Continuing operations (in dollars per share)	$ 0.30	$ 1.93	$ 2.55	$ 4.37
Discontinued operations (in dollars per share)	(0.17)	0.54	0.55	1.30
Basic Earnings per Common Share (in dollars per share)	$ 0.13	$ 2.47	$ 3.10	$ 5.67
Diluted Earnings per Share
Net Income attributable to DTE Energy — continuing operations	$ 58	$ 372	$ 495	$ 844
Less: Allocation of earnings to net restricted stock awards	0	1	1	2
Net income from continuing operations available to common shareholders — diluted	58	371	494	842
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)	104	106	249
Net income available to common shareholders — diluted	$ 25	$ 475	$ 600	$ 1,091
Average number of common shares outstanding — basic (in shares)	193.0	193.0	193.0	192.0
Average dilutive equity units, performance share awards, and stock options (in shares)	1.0	0.0	1.0	1.0
Average number of common shares outstanding — diluted (in shares)	194.0	193.0	194.0	193.0
Continuing operations (in dollars per share)	$ 0.30	$ 1.92	$ 2.55	$ 4.37
Discontinued operations (in dollars per share)	(0.17)	0.54	0.55	1.29
Diluted Earnings per Common Share (in dollars per share)	$ 0.13	$ 2.46	$ 3.10	$ 5.66
Antidilutive securities excluded from computation of earnings per share (in shares)	11.1	10.3	11.5	10.3

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Common Stock and Earnings Per Share (Details Textuals) $ / shares in Units, shares in Millions	1 Months Ended
	Jul. 31, 2021 day $ / shares	Dec. 31, 2019 USD ($) $ / shares	Nov. 30, 2022 shares	Sep. 30, 2021 USD ($) shares
Debt Instrument [Line Items]
Face amount | $				$ 4,100,000,000
Equity units, face amount of attached debt instrument | $		$ 1,000
Equity units subject to mandatory redemption
Debt Instrument [Line Items]
Forward contract indexed to issuer's equity, forward rate per share (in dollars per share) | $ / shares		$ 50
Equity units, percentage interest in attached debt instrument		0.005%
Financial instruments subject to mandatory redemption, settlement terms, share value, amount | $		$ 150,000,000
Stock purchase contract liability | $				$ 64,000,000
Financial instruments subject to mandatory redemption, settlement terms, maximum number of shares (in shares) | shares				13.0
Equity units subject to mandatory redemption | Minimum | Forecast
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, settlement terms, number of shares (in shares) | shares			9.8
Equity units subject to mandatory redemption | Maximum | Forecast
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, settlement terms, number of shares (in shares) | shares			12.2
Equity units subject to mandatory redemption | Equal to or greater than $133.08, 0.3757 shares of common stock
Debt Instrument [Line Items]
Number of consecutive scheduled trading days | day	20
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio	0.3757
Equity units subject to mandatory redemption | Equal to or greater than $133.08, 0.3757 shares of common stock | Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares	$ 133.08
Equity units subject to mandatory redemption | Less than $133.08, but greater than $106.50, number of shares of common stock equal to $50 divided by the AMV
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio	50
Equity units subject to mandatory redemption | Less than $133.08, but greater than $106.50, number of shares of common stock equal to $50 divided by the AMV | Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares	$ 106.50
Equity units subject to mandatory redemption | Less than $133.08, but greater than $106.50, number of shares of common stock equal to $50 divided by the AMV | Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares	$ 133.08
Equity units subject to mandatory redemption | Less than or equal to $106.50, 0.4695 shares of common stock
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio	0.4695
Equity units subject to mandatory redemption | Less than or equal to $106.50, 0.4695 shares of common stock | Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares	$ 106.50
November 2019 Series F 2.25% RSNs Maturing 2025 | Equity Units
Debt Instrument [Line Items]
Face amount | $		$ 1,300,000,000
Interest rate		2.25%

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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative assets
Derivative assets, gross	$ 2,340	$ 567
Derivative asset, netting	(1,912)	(411)
Derivative assets, net	428	156
Derivative liabilities
Derivative liabilities, gross	(2,557)	(533)
Derivative liability, netting	1,848	405
Derivative liabilities, net	(709)	(128)
DTE Electric
Assets
Nuclear decommissioning trusts	2,007	1,855
Current liabilities
Derivative liabilities
Derivative liabilities, gross	(2,011)	(386)
Noncurrent liabilities
Derivative liabilities
Derivative liabilities, gross	(546)	(147)
Natural gas
Derivative assets
Derivative assets, gross	778	233
Derivative asset, netting	(715)	(156)
Derivative assets, net	63	77
Derivative liabilities
Derivative liabilities, gross	(1,055)	(223)
Derivative liability, netting	664	151
Derivative liabilities, net	(391)	(72)
Electricity
Derivative assets
Derivative assets, gross	952	180
Derivative asset, netting	(627)	(120)
Derivative assets, net	325	60
Derivative liabilities
Derivative liabilities, gross	(916)	(168)
Derivative liability, netting	614	125
Derivative liabilities, net	(302)	(43)
Environmental & Other
Derivative assets
Derivative assets, gross	610	154
Derivative asset, netting	(570)	(135)
Derivative assets, net	40	19
Derivative liabilities
Derivative liabilities, gross	(581)	(137)
Derivative liability, netting	570	129
Derivative liabilities, net	(11)	(8)
Foreign currency exchange contracts
Derivative liabilities
Derivative liabilities, gross	(5)	(5)
Derivative liability, netting	0	0
Derivative liabilities, net	(5)	(5)
Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	34	27
Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	175	104
Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,140	1,169
Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	658	555
Recurring
Assets
Cash equivalents	9	438
Derivative assets
Derivative asset, netting	(1,912)	(411)
Derivative assets, net	428	156
Total assets	2,598	2,609
Derivative liabilities
Derivative liability, netting	1,848	405
Derivative liabilities, net	(709)	(128)
Net Assets (Liabilities) at end of period	1,889	2,481
Net Assets at end of period, netting	(64)	(6)
Recurring | DTE Electric
Assets
Cash equivalents	0	4
Derivative assets
Total assets	2,048	1,890
Recurring | Current assets
Derivative assets
Derivative asset, netting	(1,591)	(330)
Total assets	356	554
Recurring | Current assets | DTE Electric
Derivative assets
Total assets	12	8
Recurring | Noncurrent assets
Derivative assets
Derivative asset, netting	(321)	(81)
Total assets	2,242	2,055
Recurring | Noncurrent assets | DTE Electric
Derivative assets
Total assets	2,036	1,882
Recurring | Current liabilities
Derivative liabilities
Derivative liability, netting	1,546	318
Derivative liabilities, net	(465)	(68)
Recurring | Noncurrent liabilities
Derivative liabilities
Derivative liability, netting	302	87
Derivative liabilities, net	(244)	(60)
Recurring | Restricted cash
Assets
Cash equivalents	1	2
Recurring | Natural gas
Derivative assets
Derivative asset, netting	(715)	(156)
Derivative assets, net	63	77
Derivative liabilities
Derivative liability, netting	664	151
Derivative liabilities, net	(391)	(72)
Recurring | Electricity
Derivative assets
Derivative asset, netting	(627)	(120)
Derivative assets, net	325	60
Derivative liabilities
Derivative liability, netting	614	125
Derivative liabilities, net	(302)	(43)
Recurring | Environmental & Other
Derivative assets
Derivative asset, netting	(570)	(135)
Derivative assets, net	40	19
Derivative liabilities
Derivative liability, netting	570	129
Derivative liabilities, net	(11)	(8)
Recurring | Foreign currency exchange contracts
Derivative liabilities
Derivative liability, netting	0	0
Derivative liabilities, net	(5)	(5)
Recurring | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	12	4
Recurring | Cash equivalents
Assets
Nuclear decommissioning trusts	34	27
Other investments	86	97
Recurring | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	34	27
Other investments	11	11
Recurring | Private equity and other
Assets
Nuclear decommissioning trusts	175	104
Recurring | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	175	104
Recurring | Equity securities
Assets
Nuclear decommissioning trusts	1,140	1,169
Other investments	61	55
Recurring | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,140	1,169
Other investments	18	16
Recurring | Fixed income securities
Assets
Nuclear decommissioning trusts	658	555
Other investments	7	8
Recurring | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	658	555
Recurring | Level 1
Assets
Cash equivalents	9	438
Derivative assets
Derivative assets, gross	579	99
Total assets	1,847	1,773
Derivative liabilities
Derivative liabilities, gross	(425)	(88)
Net Assets (Liabilities) at end of period	1,422	1,685
Recurring | Level 1 | DTE Electric
Assets
Cash equivalents	0	4
Derivative assets
Total assets	1,134	1,107
Recurring | Level 1 | Current assets
Derivative assets
Total assets	506	532
Recurring | Level 1 | Current assets | DTE Electric
Derivative assets
Total assets	0	4
Recurring | Level 1 | Noncurrent assets
Derivative assets
Total assets	1,341	1,241
Recurring | Level 1 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	1,134	1,103
Recurring | Level 1 | Current liabilities
Derivative liabilities
Derivative liabilities, gross	(409)	(84)
Recurring | Level 1 | Noncurrent liabilities
Derivative liabilities
Derivative liabilities, gross	(16)	(4)
Recurring | Level 1 | Natural gas
Derivative assets
Derivative assets, gross	579	99
Derivative liabilities
Derivative liabilities, gross	(425)	(88)
Recurring | Level 1 | Electricity
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 1 | Environmental & Other
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 1 | Foreign currency exchange contracts
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	0	0
Recurring | Level 1 | Cash equivalents
Assets
Nuclear decommissioning trusts	34	27
Other investments	86	97
Recurring | Level 1 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	34	27
Other investments	11	11
Recurring | Level 1 | Private equity and other
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 1 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 1 | Equity securities
Assets
Nuclear decommissioning trusts	944	947
Other investments	61	55
Recurring | Level 1 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	944	947
Other investments	18	16
Recurring | Level 1 | Fixed income securities
Assets
Nuclear decommissioning trusts	127	102
Other investments	7	8
Recurring | Level 1 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	127	102
Recurring | Level 2
Assets
Cash equivalents	0	0
Derivative assets
Derivative assets, gross	1,451	352
Total assets	1,880	723
Derivative liabilities
Derivative liabilities, gross	(1,459)	(327)
Net Assets (Liabilities) at end of period	421	396
Recurring | Level 2 | DTE Electric
Assets
Cash equivalents	0	0
Derivative assets
Total assets	429	371
Recurring | Level 2 | Current assets
Derivative assets
Total assets	1,183	260
Recurring | Level 2 | Current assets | DTE Electric
Derivative assets
Total assets	0	0
Recurring | Level 2 | Noncurrent assets
Derivative assets
Total assets	697	463
Recurring | Level 2 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	429	371
Recurring | Level 2 | Current liabilities
Derivative liabilities
Derivative liabilities, gross	(1,138)	(223)
Recurring | Level 2 | Noncurrent liabilities
Derivative liabilities
Derivative liabilities, gross	(321)	(104)
Recurring | Level 2 | Natural gas
Derivative assets
Derivative assets, gross	146	74
Derivative liabilities
Derivative liabilities, gross	(297)	(59)
Recurring | Level 2 | Electricity
Derivative assets
Derivative assets, gross	707	128
Derivative liabilities
Derivative liabilities, gross	(576)	(126)
Recurring | Level 2 | Environmental & Other
Derivative assets
Derivative assets, gross	598	150
Derivative liabilities
Derivative liabilities, gross	(581)	(137)
Recurring | Level 2 | Foreign currency exchange contracts
Derivative liabilities
Derivative liabilities, gross	(5)	(5)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	0	0
Recurring | Level 2 | Cash equivalents
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Private equity and other
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 2 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 2 | Equity securities
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Fixed income securities
Assets
Nuclear decommissioning trusts	429	371
Other investments	0	0
Recurring | Level 2 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	429	371
Recurring | Level 3
Assets
Cash equivalents	0	0
Derivative assets
Derivative assets, gross	310	116
Total assets	310	116
Derivative liabilities
Derivative liabilities, gross	(673)	(118)
Net Assets (Liabilities) at end of period	(363)	(2)
Recurring | Level 3 | DTE Electric
Assets
Cash equivalents	0	0
Derivative assets
Total assets	12	4
Recurring | Level 3 | Current assets
Derivative assets
Total assets	258	92
Recurring | Level 3 | Current assets | DTE Electric
Derivative assets
Total assets	12	4
Recurring | Level 3 | Noncurrent assets
Derivative assets
Total assets	52	24
Recurring | Level 3 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	0	0
Recurring | Level 3 | Current liabilities
Derivative liabilities
Derivative liabilities, gross	(464)	(79)
Recurring | Level 3 | Noncurrent liabilities
Derivative liabilities
Derivative liabilities, gross	(209)	(39)
Recurring | Level 3 | Natural gas
Derivative assets
Derivative assets, gross	53	60
Derivative liabilities
Derivative liabilities, gross	(333)	(76)
Recurring | Level 3 | Electricity
Derivative assets
Derivative assets, gross	245	52
Derivative liabilities
Derivative liabilities, gross	(340)	(42)
Recurring | Level 3 | Environmental & Other
Derivative assets
Derivative assets, gross	12	4
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 3 | Foreign currency exchange contracts
Derivative liabilities
Derivative liabilities, gross	0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	12	4
Recurring | Level 3 | Cash equivalents
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Private equity and other
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Equity securities
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Fixed income securities
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Other
Derivative assets
Total assets	473	408
Derivative liabilities
Net Assets (Liabilities) at end of period	473	408
Recurring | Other | DTE Electric
Derivative assets
Total assets	473	408
Recurring | Other | Noncurrent assets
Derivative assets
Total assets	473	408
Recurring | Other | Noncurrent assets | DTE Electric
Derivative assets
Total assets	473	408
Recurring | Other | Private equity and other
Assets
Nuclear decommissioning trusts	175	104
Recurring | Other | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	175	104
Recurring | Other | Equity securities
Assets
Nuclear decommissioning trusts	196	222
Recurring | Other | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	196	222
Recurring | Other | Fixed income securities
Assets
Nuclear decommissioning trusts	102	82
Recurring | Other | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	$ 102	$ 82

XML

Fair Value (Details Textuals) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Nuclear decommissioning trust fund | Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities with no contractual maturity date	$ 102
Equity or debt securities | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, redemption notice period	7 days
Equity or debt securities | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, redemption notice period	65 days
Private equity and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unfunded commitments related to investments classified as NAV assets	$ 155	$ 183
Private equity and other | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments classified as NAV assets, general contractual durations	7 years
Private equity and other | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments classified as NAV assets, general contractual durations	12 years

XML

Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	$ (215)	$ 46	$ (2)	$ 4
Transfers from Level 3 into Level 2	0	(1)	0	(5)
Total gains (losses)
Included in earnings	(183)	(42)	(361)	39
Recorded in Regulatory liabilities	(1)	9	14	21
Purchases, issuances, and settlements
Settlements	36	(39)	(14)	(86)
Net Assets (Liabilities) as of end of period	(363)	(27)	(363)	(27)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	(141)	(47)	(372)	16
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period			12	7
DTE Electric
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	15	10	4	3
Total gains (losses)
Recorded in Regulatory liabilities	(1)	9	14	21
Purchases, issuances, and settlements
Settlements	(2)	(12)	(6)	(17)
Net Assets (Liabilities) as of end of period	12	7	12	7
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	0	0	12	7
Natural gas
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	(181)	20	(16)	(15)
Transfers from Level 3 into Level 2	0	(1)	0	(5)
Total gains (losses)
Included in earnings	(162)	(80)	(356)	(44)
Recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	63	22	92	25
Net Assets (Liabilities) as of end of period	(280)	(39)	(280)	(39)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	(109)	(57)	(301)	(20)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period			0	0
Electricity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	(49)	16	10	16
Transfers from Level 3 into Level 2	0	0	0	0
Total gains (losses)
Included in earnings	(21)	37	(5)	90
Recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	(25)	(48)	(100)	(101)
Net Assets (Liabilities) as of end of period	(95)	5	(95)	5
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	(30)	11	(54)	53
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period			0	0
Other
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	15	10	4	3
Transfers from Level 3 into Level 2	0	0	0	0
Total gains (losses)
Included in earnings	0	1	0	(7)
Recorded in Regulatory liabilities	(1)	9	14	21
Purchases, issuances, and settlements
Settlements	(2)	(13)	(6)	(10)
Net Assets (Liabilities) as of end of period	12	7	12	7
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	$ (2)	$ (1)	(17)	(17)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period			$ 12	$ 7

XML

Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Sep. 30, 2021 USD ($) MMBTU MWh	Dec. 31, 2020 USD ($) MMBTU MWh
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 2,340	$ 567
Derivative Liabilities	(2,557)	(533)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	778	233
Derivative Liabilities	(1,055)	(223)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	952	180
Derivative Liabilities	$ (916)	$ (168)
Level 3 | Natural gas | Forward basis price | Minimum | Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price | MMBTU	(1.33)	(0.86)
Level 3 | Natural gas | Forward basis price | Maximum | Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price | MMBTU	3.53	2.50
Level 3 | Natural gas | Forward basis price | Weighted Average | Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price | MMBTU	(0.04)	(0.07)
Level 3 | Electricity | Forward basis price | Minimum | Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price | MWh	(8)	(9)
Level 3 | Electricity | Forward basis price | Maximum | Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price | MWh	10	6
Level 3 | Electricity | Forward basis price | Weighted Average | Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price | MWh	(1)	0
Recurring | Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 310	$ 116
Derivative Liabilities	(673)	(118)
Recurring | Level 3 | Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	53	60
Derivative Liabilities	(333)	(76)
Recurring | Level 3 | Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	245	52
Derivative Liabilities	$ (340)	$ (42)

XML

Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	$ 142	$ 141
Short-term borrowings	361	38
Notes payable	5	19
Long-term debt	17,222	19,439
Carrying amount | DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	17	16
Short-term borrowings	159	0
Notes payable	4	17
Long-term debt	8,906	8,236
Carrying amount | DTE Electric | Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	32	101
Fair value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	0	0
Short-term borrowings	0	0
Notes payable	0	0
Long-term debt	2,241	2,547
Fair value | Level 1 | DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	0	0
Short-term borrowings	0	0
Notes payable	0	0
Long-term debt	0	0
Fair value | Level 1 | DTE Electric | Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Fair value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	0	0
Short-term borrowings	361	38
Notes payable	0	0
Long-term debt	15,486	18,230
Fair value | Level 2 | DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	0	0
Short-term borrowings	159	0
Notes payable	0	0
Long-term debt	9,952	9,579
Fair value | Level 2 | DTE Electric | Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Fair value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	142	141
Short-term borrowings	0	0
Notes payable	5	19
Long-term debt	1,104	1,397
Fair value | Level 3 | DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	17	16
Short-term borrowings	0	0
Notes payable	4	17
Long-term debt	150	379
Fair value | Level 3 | DTE Electric | Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	$ 32	$ 101

XML

Fair Value (Fair Value of Nuclear Decommissioning Trust Fund Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Nuclear decommissioning trust funds	$ 2,007	$ 1,855
DTE Electric
Debt Securities, Available-for-sale [Line Items]
Nuclear decommissioning trust funds	2,007	1,855
DTE Electric | Nuclear decommissioning trust fund
Debt Securities, Available-for-sale [Line Items]
Nuclear decommissioning trust funds	2,007	1,855
DTE Electric | Nuclear decommissioning trust fund | Fermi 2
Debt Securities, Available-for-sale [Line Items]
Nuclear decommissioning trust funds	1,989	1,841
DTE Electric | Nuclear decommissioning trust fund | Fermi 1
Debt Securities, Available-for-sale [Line Items]
Nuclear decommissioning trust funds	3	3
DTE Electric | Nuclear decommissioning trust fund | Low-level radioactive waste
Debt Securities, Available-for-sale [Line Items]
Nuclear decommissioning trust funds	$ 15	$ 11

XML

Fair Value (Gains and Losses and Proceeds from the Sale of Securities by the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - Nuclear decommissioning trust fund - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 21	$ 38	$ 80	$ 172
Realized losses	(1)	(11)	(9)	(103)
Proceeds from sale of securities	$ 217	$ 816	$ 854	$ 2,054

XML

Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 2,007	$ 1,855
Unrealized Gains	572	501
Unrealized Losses	(15)	(7)
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	34	27
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	175	104
Unrealized Gains	41	0
Unrealized Losses	(2)	0
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,140	1,169
Unrealized Gains	507	481
Unrealized Losses	(8)	(6)
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	658	555
Unrealized Gains	24	20
Unrealized Losses	$ (5)	$ (1)

XML

Fair Value (Fair Value of Fixed Income Securities Held in Nuclear Decommissioning Trust Funds (Details) - Fixed income securities - Nuclear decommissioning trust fund $ in Millions	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 11
Due after one through five years	138
Due after five through ten years	112
Due after ten years	295
Fixed income securities total	$ 556

XML

Fair Value (Gains (Losses) Related to the Trust) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Rabbi Trust
Schedule of Investments [Line Items]
Gains (losses) related to the trust	$ (1)	$ 2	$ 3	$ (7)
Equity securities
Schedule of Investments [Line Items]
Gains (losses) related to the trust	(1)	2	3	(4)
Fixed income securities
Schedule of Investments [Line Items]
Gains (losses) related to the trust	$ 0	$ 0	$ 0	$ (3)

XML

Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 2,340	$ 567
Derivative Liabilities	(2,557)	(533)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,938	446
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(2,011)	(386)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	402	121
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(546)	(147)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(5)	(5)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	778	233
Derivative Liabilities	(1,055)	(223)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	952	180
Derivative Liabilities	(916)	(168)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	610	154
Derivative Liabilities	(581)	(137)
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(3)	(4)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	2,340	567
Derivative Liabilities	(2,554)	(529)
Derivatives not designated as hedging instruments | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	12	4
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(2)	(1)
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	778	233
Derivative Liabilities	(1,055)	(223)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	952	180
Derivative Liabilities	(916)	(168)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	610	154
Derivative Liabilities	(581)	(137)
Derivatives not designated as hedging instruments | FTRs — Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 12	$ 4

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Financial and Other Derivative Instruments (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Letters of credit that could be used to offset net derivative liabilities	$ 20	$ 7
Letters of credit received that could be used to offset net derivative assets	55	$ 9
Contractual obligation to post collateral in event of downgrade to below investment grade	575
Derivative net liability position aggregate fair value	2,180
Collateral already posted fair value	52
Derivative net asset position, fair value	1,788
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions	$ 340

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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral netted against Derivative assets	$ (122)	$ (12)
Cash collateral netted against Derivative liabilities	58	6
Cash collateral recorded in Accounts receivable	66	14
Cash collateral recorded in Accounts payable	(8)	(1)
Total net cash collateral posted (received)	$ (6)	$ 7

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Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 2,340	$ 567
Gross Amounts Offset in the Consolidated Statements of Financial Position	(1,912)	(411)
Derivative assets, net	428	156
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(2,557)	(533)
Gross Amounts Offset in the Consolidated Statements of Financial Position	1,848	405
Derivative liabilities, net	(709)	(128)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	778	233
Gross Amounts Offset in the Consolidated Statements of Financial Position	(715)	(156)
Derivative assets, net	63	77
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1,055)	(223)
Gross Amounts Offset in the Consolidated Statements of Financial Position	664	151
Derivative liabilities, net	(391)	(72)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	952	180
Gross Amounts Offset in the Consolidated Statements of Financial Position	(627)	(120)
Derivative assets, net	325	60
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(916)	(168)
Gross Amounts Offset in the Consolidated Statements of Financial Position	614	125
Derivative liabilities, net	(302)	(43)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	610	154
Gross Amounts Offset in the Consolidated Statements of Financial Position	(570)	(135)
Derivative assets, net	40	19
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(581)	(137)
Gross Amounts Offset in the Consolidated Statements of Financial Position	570	129
Derivative liabilities, net	(11)	(8)
Foreign currency exchange contracts
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(5)	(5)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	$ (5)	$ (5)

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Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Assets
Derivative Assets	$ 2,340	$ 567
Collateral adjustment	(122)	(12)
Derivative assets, current	347	116
Derivative assets, noncurrent	81	40
Derivative Liabilities
Derivative Liabilities	(2,557)	(533)
Collateral adjustment	58	6
Derivative liabilities, current	(465)	(68)
Derivative liabilities, noncurrent	(244)	(60)
Current derivative assets
Derivative Assets
Derivative Assets	1,938	446
Counterparty netting	(1,498)	(318)
Collateral adjustment	(93)	(12)
Derivative assets, current	347	116
Noncurrent derivative assets
Derivative Assets
Derivative Assets	402	121
Counterparty netting	(292)	(81)
Collateral adjustment	(29)	0
Derivative assets, noncurrent	81	40
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(2,011)	(386)
Counterparty netting	1,498	318
Collateral adjustment	48	0
Derivative liabilities, current	(465)	(68)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(546)	(147)
Counterparty netting	292	81
Collateral adjustment	10	6
Derivative liabilities, noncurrent	$ (244)	$ (60)

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Financial and Other Derivative Instruments (Effect of Derivatives not Designated as Hedging Instruments on the Consolidated Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (78)	$ (45)	$ (281)	$ 0
Natural gas | Operating Revenues — Non-utility operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(214)	(27)	(371)	(63)
Natural gas | Fuel, purchased power, gas, and other — non-utility
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	63	(51)	(16)	28
Electricity | Operating Revenues — Non-utility operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	68	33	143	75
Environmental & Other | Operating Revenues — Non-utility operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	3	2	(36)	(40)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 2	$ (2)	$ (1)	$ 0

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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)	9 Months Ended
	Sep. 30, 2021 CAD ($) MMBTU MWh T
Natural gas (MMBtu)
Derivative [Line Items]
Commodity, energy measures | MMBTU	2,096,409,912
Electricity (MWh)
Derivative [Line Items]
Commodity, energy measures	29,383,562
Foreign currency exchange ($ CAD)
Derivative [Line Items]
Commodity, monetary measure | $	$ 119,281,865
Renewable Energy Certificates (MWh)
Derivative [Line Items]
Commodity, energy measures	8,387,594
Carbon emissions (Metric Tons)
Derivative [Line Items]
Commodity, mass measure | T	48,343,793

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Long-Term Debt (Schedule of Issued Debt) (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Amount	$ 4,100,000,000
DTE Electric | Mortgage Bonds | March 2021 1.9% Mortgage Bonds maturing in 2028
Debt Instrument [Line Items]
Interest rate			1.90%
Amount			$ 575,000,000
DTE Electric | Mortgage Bonds | March 2021 3.25% Mortgage Bonds maturing In 2051
Debt Instrument [Line Items]
Interest rate			3.25%
Amount			$ 425,000,000
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028
Debt Instrument [Line Items]
Amount		$ 1,000,000,000
DT Midstream | Senior Notes
Debt Instrument [Line Items]
Amount		$ 2,100,000,000
DT Midstream | Senior Notes | June 2021 4.125% Senior Notes maturing in 2029
Debt Instrument [Line Items]
Interest rate		4.125%
Amount		$ 1,100,000,000
DT Midstream | Senior Notes | June 2021 4.375% Senior Notes maturing in 2031
Debt Instrument [Line Items]
Interest rate		4.375%
Amount		$ 1,000,000,000

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Long-Term Debt (Details Textuals) - USD ($)	2 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Nov. 30, 2021	Jun. 30, 2021
Debt Instrument [Line Items]
Face amount		$ 4,100,000,000	$ 4,100,000,000
Redemption of long-term debt	$ 2,600,000,000		3,242,000,000	$ 682,000,000
Prepayment costs for extinguishment of long-term debt			361,000,000	0
Senior Notes
Debt Instrument [Line Items]
Redemption of long-term debt		2,600,000,000
Prepayment costs for extinguishment of long-term debt		361,000,000
Write off of unamortized issuance costs and discounts		15,000,000
2.07% First Mortgage Bonds maturing in 2031 | Mortgage Bonds | Forecast
Debt Instrument [Line Items]
Face amount					$ 60,000,000
Interest rate					2.07%
2.85% First Mortgage Bonds maturing in 2051 | Mortgage Bonds | Forecast
Debt Instrument [Line Items]
Face amount					$ 95,000,000
Interest rate					2.85%
DTE Electric
Debt Instrument [Line Items]
Redemption of long-term debt			321,000,000	$ 632,000,000
DTE Electric | 1.45% Revenue Bonds maturing in 2030 | Tax Exempt Revenue Bonds
Debt Instrument [Line Items]
Face amount		$ 82,000,000	$ 82,000,000
Interest rate		1.45%	1.45%			1.45%
DTE Electric | 1.35% Revenue Bonds maturing in 2029 | Tax Exempt Revenue Bonds
Debt Instrument [Line Items]
Face amount		$ 59,000,000	$ 59,000,000
Interest rate		1.35%	1.35%			1.45%

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Long-Term Debt (Schedule of Debt Redeemed) (Details) - USD ($) $ in Millions	1 Months Ended					2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Aug. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument, Redemption [Line Items]
Amount						$ 2,600			$ 3,242	$ 682
Loss on extinguishment of debt							$ 376	$ 0	384	0
Junior Subordinated Debentures | 5.375% Junior Subordinated Debentures maturing in 2076
Debt Instrument, Redemption [Line Items]
Interest rate			5.375%
Amount			$ 300
Loss on extinguishment of debt			$ 8
Senior Notes
Debt Instrument, Redemption [Line Items]
Amount							$ 2,600
Senior Notes | 3.30% Senior Notes maturing in 2022
Debt Instrument, Redemption [Line Items]
Interest rate		3.30%
Amount		$ 300
Senior Notes | 2.60% Senior Notes maturing in 2022
Debt Instrument, Redemption [Line Items]
Interest rate		2.60%
Amount		$ 300
Senior Notes | 3.70% Senior Notes maturing in 2023
Debt Instrument, Redemption [Line Items]
Interest rate		3.70%
Amount		$ 600
Senior Notes | 3.85% Senior Notes maturing in 2023
Debt Instrument, Redemption [Line Items]
Interest rate	3.85%	3.85%				3.85%
Amount	$ 165	$ 135
Senior Notes | 3.50% Senior Notes maturing in 2024
Debt Instrument, Redemption [Line Items]
Interest rate		3.50%
Amount		$ 350
Senior Notes | 3.80% Senior Notes maturing in 2027
Debt Instrument, Redemption [Line Items]
Interest rate		3.80%
Amount		$ 350
Senior Notes | 3.40% Senior Notes maturing in 2029
Debt Instrument, Redemption [Line Items]
Interest rate		3.40%
Amount		$ 21
Senior Notes | 6.375% Senior Notes maturing in 2033
Debt Instrument, Redemption [Line Items]
Interest rate	6.375%	6.375%				6.375%
Amount	$ 209	$ 191
DTE Electric
Debt Instrument, Redemption [Line Items]
Amount									$ 321	$ 632
DTE Electric | Mortgage Bonds | 3.90% Mortgage bonds maturing in 2021
Debt Instrument, Redemption [Line Items]
Interest rate					3.90%
Amount					$ 250
DTE Electric | Mortgage Bonds | 7.00% Mortgage Bonds maturing in 2021
Debt Instrument, Redemption [Line Items]
Interest rate				7.00%
Amount				$ 33
DTE Electric | Mortgage Bonds | 6.90% Senior Notes Due In 2021
Debt Instrument, Redemption [Line Items]
Interest rate	6.90%					6.90%
Amount	$ 38

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Short-Term Credit Arrangements and Borrowings (Details Textuals)	Sep. 30, 2021 USD ($)	Jun. 30, 2021	Dec. 31, 2020 USD ($)
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.51
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.46
DTE Energy
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.66
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 300,000,000
Amount outstanding	4,000,000		$ 49,000,000
DTE Energy | Demand financing agreement | Demand financing agreement, indefinite term
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	100,000,000
Maximum additional margin financing	50,000,000
DTE Energy | Demand financing agreement | Demand financing agreement, expiring in 2022
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 150,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.70	0.65

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Short-Term Credit Arrangements and Borrowings (Details) $ in Millions	Sep. 30, 2021 USD ($)
Availability under combined facilities
Maximum borrowing capacity	$ 2,657
Amounts outstanding	629
Net availability	2,028
DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500
Amounts outstanding	159
Net availability	341
DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300
Amounts outstanding	128
Net availability	172
DTE Energy
Availability under combined facilities
Maximum borrowing capacity	1,857
Amounts outstanding	342
Net availability	1,515
Revolver borrowings
Availability under combined facilities
Amounts outstanding	74
Revolver borrowings | DTE Electric
Availability under combined facilities
Amounts outstanding	0
Revolver borrowings | DTE Gas
Availability under combined facilities
Amounts outstanding	0
Revolver borrowings | DTE Energy
Availability under combined facilities
Amounts outstanding	74
Commercial paper issuances
Availability under combined facilities
Amounts outstanding	287
Commercial paper issuances | DTE Electric
Availability under combined facilities
Amounts outstanding	159
Commercial paper issuances | DTE Gas
Availability under combined facilities
Amounts outstanding	128
Commercial paper issuances | DTE Energy
Availability under combined facilities
Amounts outstanding	0
Letters of credit
Availability under combined facilities
Amounts outstanding	268
Letters of credit | DTE Electric
Availability under combined facilities
Amounts outstanding	0
Letters of credit | DTE Gas
Availability under combined facilities
Amounts outstanding	0
Letters of credit | DTE Energy
Availability under combined facilities
Amounts outstanding	268
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	2,300
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	1,500
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	87
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	87
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	150
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	150
Unsecured letter of credit facility, expiring in July 2023 | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	70
Unsecured letter of credit facility, expiring in July 2023 | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in July 2023 | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in July 2023 | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	70
Unsecured letter of credit facility | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	50
Unsecured letter of credit facility | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	50
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	102
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	22
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	13
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	$ 67

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Leases (Details Textuals) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Additional net investment in finance leases		$ 31
Interest income recognized under finance leases	$ 4		$ 4	$ 13	$ 12

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Leases (Components of Net Investment in Finance Leases) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Leases [Abstract]
2021	$ 6
2022	22
2023	22
2024	22
2025	22
2026 and Thereafter	292
Total minimum future lease receipts	386
Residual value of leased pipeline	17
Less unearned income	202
Net investment in finance lease	201
Less current portion	7
Net investment in finance lease, noncurrent	$ 194

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Leases (Lease Income Associated with Operating Leases) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessor, Lease, Description [Line Items]
Fixed payments	$ 13	$ 14	$ 42	$ 43
Variable payments	55	43	90	82
Total lease income under operating leases	68	57	132	125
Operating revenues
Lessor, Lease, Description [Line Items]
Total lease income under operating leases	26	26	70	74
Other income
Lessor, Lease, Description [Line Items]
Total lease income under operating leases	$ 42	$ 31	$ 62	$ 51

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Commitments and Contingencies (Details Textuals)	1 Months Ended	9 Months Ended
	Jun. 30, 2020	Sep. 30, 2021 USD ($) employee facility site	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Estimated capital expenditures and contributions to equity method investees for current fiscal year		$ 3,900,000,000
Workforce subject to collective bargaining arrangements | Labor force concentration risk
Loss Contingencies [Line Items]
Number of employees | employee		5,100
Percentage of total employees		50.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Labor force concentration risk
Loss Contingencies [Line Items]
Percentage of total employees		16.00%
Synthetic fuel
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations		90 days
Maximum potential liability		$ 400,000,000
Reduced emissions fuel guarantees
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations		90 days
Maximum potential liability		$ 698,000,000
Other guarantees
Loss Contingencies [Line Items]
Maximum potential liability		40,000,000
Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding		$ 171,000,000
Reduction of Carbon Emissions by 2023
Loss Contingencies [Line Items]
Commitment to reduce carbon emissions, percentage		32.00%
Reduction of Carbon Emissions by 2028
Loss Contingencies [Line Items]
Commitment to reduce carbon emissions, percentage		50.00%
Reduction of Carbon Emissions by 2040
Loss Contingencies [Line Items]
Commitment to reduce carbon emissions, percentage		80.00%
DTE Electric
Loss Contingencies [Line Items]
Environmental capital expenditures		$ 2,400,000,000
Estimated environmental capital expenditures		$ 0
Number of former MGP sites | site		3
Accrued for remediation		$ 13,000,000	$ 10,000,000
Number of permitted engineered ash storage facilities owned | facility		3
Estimated capital expenditures and contributions to equity method investees for current fiscal year		$ 3,000,000,000
DTE Electric | Workforce subject to collective bargaining arrangements | Labor force concentration risk
Loss Contingencies [Line Items]
Number of employees | employee		2,700
Percentage of total employees		57.00%
DTE Electric | Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Labor force concentration risk
Loss Contingencies [Line Items]
Percentage of total employees		21.00%
DTE Electric | Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding		$ 120,000,000
DTE Electric | Reduction of Carbon Emissions by 2050
Loss Contingencies [Line Items]
Goal of net carbon emissions, percentage		0.00%
DTE Electric | Coal Combustion Residual And Effluent Limitations Guidelines Rules
Loss Contingencies [Line Items]
Estimated impact of the CCR and ELG rules		$ 661,000,000
Estimated impact of the CCR and ELG rules through 2025		$ 516,000,000
DTE Gas
Loss Contingencies [Line Items]
Number of former MGP sites | site		14
Accrued for remediation		$ 24,000,000	$ 24,000,000
Amortization period (in years)		10 years
DTE Gas | Clean up completed and site closed
Loss Contingencies [Line Items]
Number of former MGP sites | site		8
DTE Gas | Partial closure complete
Loss Contingencies [Line Items]
Number of former MGP sites | site		4
DTE Gas | Reduction of Greenhouse Gas Emissions by 2050
Loss Contingencies [Line Items]
Goal of net greenhouse gas emissions, percentage	0.00%

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Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 27	$ 25	$ 81	$ 74
Interest cost	39	46	118	139
Expected return on plan assets	(84)	(84)	(254)	(250)
Amortization of net actuarial loss	49	43	147	129
Amortization of prior service credit	0	0	0	0
Settlements	0	2	0	2
Net periodic benefit cost (credit)	31	32	92	94
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	7	23	20
Interest cost	12	14	35	42
Expected return on plan assets	(33)	(32)	(97)	(96)
Amortization of net actuarial loss	3	4	10	12
Amortization of prior service credit	(5)	(5)	(15)	(15)
Settlements	0	0	0	0
Net periodic benefit cost (credit)	(15)	(12)	(44)	(37)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	17	15
Interest cost	8	11	25	32
Expected return on plan assets	(22)	(21)	(65)	(65)
Amortization of net actuarial loss	3	2	9	8
Amortization of prior service credit	(3)	(3)	(10)	(10)
Net periodic benefit cost (credit)	$ (8)	$ (6)	$ (24)	$ (20)

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Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	$ 7,000,000		$ 7,000,000
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	0		0
DTE Electric | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost	26,000,000	$ 28,000,000	78,000,000	$ 79,000,000
DTE Electric | Pension plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	$ 0		$ 0

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Segment and Related Information (Details Textuals) customer in Millions	Sep. 30, 2021 customer
Segment Reporting [Abstract]
Number of electric utility customers	2.3
Number of gas utility customers	1.3

XML

Segment and Related Information (Financial Data - Inter-segment Billing) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating Revenues	$ (3,715)	$ (3,080)	$ (10,317)	$ (8,343)
Electric
Segment Reporting Information [Line Items]
Operating Revenues	(1,702)	(1,693)	(4,477)	(4,221)
Gas
Segment Reporting Information [Line Items]
Operating Revenues	(193)	(173)	(1,070)	(964)
DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues	(372)	(324)	(1,132)	(850)
Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues	(1,602)	(1,061)	(4,208)	(2,714)
Reconciliation and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	155	164	558	391
Reconciliation and Eliminations | Electric
Segment Reporting Information [Line Items]
Operating Revenues	17	16	48	46
Reconciliation and Eliminations | Gas
Segment Reporting Information [Line Items]
Operating Revenues	3	4	10	12
Reconciliation and Eliminations | DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues	125	134	463	308
Reconciliation and Eliminations | Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues	9	9	35	23
Reconciliation and Eliminations | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues	$ 1	$ 1	$ 2	$ 2

XML

Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	$ 1,875	$ 1,844	$ 5,483	$ 5,119
Operating Revenues — Non-utility operations	1,840	1,236	4,834	3,224
Operating Revenues	3,715	3,080	10,317	8,343
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	(155)	(172)	(572)	(408)
Operating Revenues	(155)	(164)	(558)	(391)
Electric
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	1,702	1,693	4,477	4,221
Electric | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	1,700	1,690	4,468	4,211
Operating Revenues — Non-utility operations	2	3	9	10
Electric | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(17)	(16)	(48)	(46)
Gas
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	193	173	1,070	964
Gas | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	193	173	1,070	964
Gas | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(3)	(4)	(10)	(12)
DTE Vantage
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	372	324	1,132	850
DTE Vantage | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	372	324	1,132	850
DTE Vantage | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(125)	(134)	(463)	(308)
Energy Trading
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	1,602	1,061	4,208	2,714
Energy Trading | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	1,602	1,061	4,208	2,714
Energy Trading | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(9)	(9)	(35)	(23)
Corporate and Other | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	1	1	2	2
Corporate and Other | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	$ (1)	(1)	(2)	(2)
Gas Storage and Pipelines | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations		$ 8	$ 14	$ 17

XML

Segment and Related Information (Financial Data - Net Income (Loss) Attributable to DTE Energy by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	$ 58	$ 372	$ 495	$ 844
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)	104	106	249
Net Income Attributable to DTE Energy Company/DTE Electric Company	25	476	601	1,093
Electric
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	342	398	788	675
Gas
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	(30)	(20)	146	102
DTE Vantage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	73	47	115	102
Energy Trading
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	(52)	(28)	(173)	5
Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	$ (275)	$ (25)	$ (381)	$ (40)