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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of Other Income
The following is a summary of DTE Energy's Other income:
 
2018
 
2017
 
2016
 
(In millions)
Equity earnings of equity method investees
$
132

 
$
102

 
$
68

Income from REF entities
98

 
77

 
75

Contract services
51

 
19

 
21

Allowance for equity funds used during construction
28

 
23

 
21

Gains from trading securities
6

 
26

 
15

Other
18

 
21

 
7

 
$
333

 
$
268

 
$
207

The following is a summary of DTE Electric's Other income:
 
2018
 
2017
 
2016
 
(In millions)
Contract services
$
51

 
$
21

 
$
20

Allowance for equity funds used during construction
19

 
18

 
18

Gains from trading securities allocated from DTE Energy
6

 
26

 
15

Other
7

 
12

 
8

 
$
83

 
$
77

 
$
61
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in DTE Energy's Accumulated other comprehensive income (loss) by component(a) for the years ended December 31, 2018 and 2017:
 
Net Unrealized Gain (Loss) on Derivatives
 
Net Unrealized Gain (Loss) on Investments
 
Benefit Obligations(b)
 
Foreign Currency Translation
 
Total
 
(In millions)
Balance, December 31, 2016
$
(4
)
 
$
(3
)
 
$
(120
)
 
$
(6
)
 
$
(133
)
Other comprehensive income (loss) before reclassifications
—

 
1

 
(3
)
 
1

 
(1
)
Amounts reclassified from Accumulated other comprehensive income
1

 
—

 
13

 
—

 
14

Net current-period Other comprehensive income
1

 
1


10


1


13

Balance, December 31, 2017
$
(3
)
 
$
(2
)

$
(110
)

$
(5
)

$
(120
)
Implementation of ASU 2016-01
(7
)
 
2

 
—

 
—

 
(5
)
Other comprehensive loss before reclassifications
(2
)
 
—

 
(1
)
 
(2
)
 
(5
)
Amounts reclassified from Accumulated other comprehensive income
1

 
—

 
9

 
—

 
10

Net current-period Other comprehensive income (loss)
(8
)
 
2


8


(2
)

—

Balance, December 31, 2018
$
(11
)
 
$
—


$
(102
)

$
(7
)

$
(120
)
______________________________________
(a)
All amounts are net of tax, except for Foreign currency translation.
(b)
The amounts reclassified from Accumulated other comprehensive income (loss) are included in the computation of the net periodic pension and other postretirement benefit costs (see Note 20 to the Consolidated Financial Statements, "Retirement Benefits and Trusteed Assets").
Schedule of Cash and Cash Equivalents
The following is a table that provides a reconciliation of DTE Energy's Cash and cash equivalents as well as Restricted cash reported within the Consolidated Statements of Financial Position that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows:
 
2018
 
2017
 
(In millions)
Cash and cash equivalents
$
71

 
$
66

Restricted cash
5

 
23

Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows
$
76

 
$
89
Schedule of Restricted Cash
The following is a table that provides a reconciliation of DTE Energy's Cash and cash equivalents as well as Restricted cash reported within the Consolidated Statements of Financial Position that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows:
 
2018
 
2017
 
(In millions)
Cash and cash equivalents
$
71

 
$
66

Restricted cash
5

 
23

Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows
$
76

 
$
89
Schedule of Finite-Lived Intangible Assets by Major Class
The Registrants have certain Intangible assets as shown below:
 
 
 
December 31, 2018
 
December 31, 2017
 
Useful Lives
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
 
 
(In millions)
Intangible assets subject to amortization
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
25 - 40 years(a)
 
$
779

 
$
(44
)
 
$
735

 
$
770

 
$
(24
)
 
$
746

Contract intangibles
6 to 26 years
 
159

 
(66
)
 
93

 
168

 
(72
)
 
96

 
 
 
938

 
(110
)
 
828

 
938

 
(96
)
 
842

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric renewable energy credits
(b)
 
20

 
—

 
20

 
24

 
—

 
24

DTE Electric emission allowances
(b)
 
1

 
—

 
1

 
1

 
—

 
1

 
 
 
21

 
—

 
21

 
25

 
—

 
25

Long-term intangible assets
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric
 
 
$
21

 
$
—

 
$
21

 
$
25

 
$
—

 
$
25

DTE Energy
 
 
$
959

 
$
(110
)
 
$
849

 
$
963

 
$
(96
)
 
$
867


______________________________________
(a)
The useful life of the customer relationship intangible assets is based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of gas resources in the region.
(b)
Emission allowances and renewable energy credits are charged to expense, using average cost, as the allowances and credits are consumed in the operation of the business.
Schedule of Indefinite-Lived Intangible Assets
The Registrants have certain Intangible assets as shown below:
 
 
 
December 31, 2018
 
December 31, 2017
 
Useful Lives
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
 
 
(In millions)
Intangible assets subject to amortization
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
25 - 40 years(a)
 
$
779

 
$
(44
)
 
$
735

 
$
770

 
$
(24
)
 
$
746

Contract intangibles
6 to 26 years
 
159

 
(66
)
 
93

 
168

 
(72
)
 
96

 
 
 
938

 
(110
)
 
828

 
938

 
(96
)
 
842

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric renewable energy credits
(b)
 
20

 
—

 
20

 
24

 
—

 
24

DTE Electric emission allowances
(b)
 
1

 
—

 
1

 
1

 
—

 
1

 
 
 
21

 
—

 
21

 
25

 
—

 
25

Long-term intangible assets
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric
 
 
$
21

 
$
—

 
$
21

 
$
25

 
$
—

 
$
25

DTE Energy
 
 
$
959

 
$
(110
)
 
$
849

 
$
963

 
$
(96
)
 
$
867


______________________________________
(a)
The useful life of the customer relationship intangible assets is based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of gas resources in the region.
(b)
Emission allowances and renewable energy credits are charged to expense, using average cost, as the allowances and credits are consumed in the operation of the business.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table summarizes DTE Energy's estimated customer relationship and contract intangible amortization expense expected to be recognized during each year through 2023:
 
2019
 
2020
 
2021
 
2022
 
2023
 
(In millions)
Estimated amortization expense
$
27

 
$
26

 
$
25

 
$
25

 
$
25
Schedule of Accounting Policies
See the following notes for other accounting policies impacting the Registrants’ Consolidated Financial Statements:
Note
 
Title
4
 
Revenue
8
 
Asset Retirement Obligations
9
 
Regulatory Matters
10
 
Income Taxes
12
 
Fair Value
13
 
Financial and Other Derivative Instruments
20
 
Retirement Benefits and Trusteed Assets
21
 
Stock-Based Compensation