10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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, 2019

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

For the transition period from _____ to _____

Commission File Number 001-3375

Dominion Energy South Carolina, Inc.

Exact Name of Registrant as Specified in its Charter

South Carolina	57-0248695
State or Other Jurisdiction of Incorporation or Organization	I.R.S. Employer Identification No.
400 Otarre Parkway, Cayce, South Carolina	29033
Address of Principal Executive Offices	Zip Code

(803) 217-9000

Registrant’s Telephone Number, Including Area Code

Securities registered pursuant to Section 12(b) of the Act: None

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.  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). 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.

Large accelerated filer	☐	Accelerated filer	☐	Emerging growth company	☐
Non-accelerated filer	☒	Smaller reporting 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).  Yes ☐ No ☒

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date. At October 31, 2019, Dominion Energy South Carolina, Inc. had outstanding 40,296,147 shares of common stock, all of which were held by SCANA Corporation, a wholly-owned subsidiary of Dominion Energy, Inc.

Dominion Energy South Carolina, Inc. meets the conditions set forth in General Instruction H(1)(a) and (b) of Form 10-Q and therefore is filing this Form with the reduced disclosure format allowed under General Instruction H(2).

TABLE OF CONTENTS 

		Page
	Glossary of Terms	3
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements	5
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	32
Item 4.	Controls and Procedures	35
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	36
Item 1A.	Risk Factors	36
Item 6.	Exhibits	37

2

GLOSSARY OF TERMS

The following abbreviations or acronyms used in this Form 10-Q are defined below:

Abbreviation or Acronym	Definition
2015 Task Order	Retail services agreement between DESC and the DOE, which includes a potential FERC jurisdictional charge for operating and maintaining DOE transmission facilities at the Savannah River Site
2017 Tax Reform Act	An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018 (previously known as The Tax Cuts and Jobs Act) enacted on December 22, 2017
ACE Rule	Affordable Clean Energy Rule
AOCI	Accumulated other comprehensive income (loss)
ARO	Asset retirement obligation
BLRA	South Carolina Base Load Review Act
CCR	Coal combustion residual
CEO	Chief Executive Officer
CFO	Chief Financial Officer
Consortium	A consortium consisting of Westinghouse and WECTEC
CSAPR	Cross-State Air Pollution Rule
CWA	Clean Water Act
DESC	The legal entity, Dominion Energy South Carolina, Inc. (formerly known as South Carolina Electric & Gas Company), one or more of its consolidated affiliates or operating segments, or the entirety of Dominion Energy South Carolina, Inc. and its consolidated affiliates
DESS	Dominion Energy Southeast Services, Inc. (formerly known as SCANA Services, Inc.)
DOE	U.S. Department of Energy
Dominion Energy	The legal entity, Dominion Energy, Inc., one or more of its consolidated subsidiaries (other than SCANA and DESC) or operating segments, or the entirety of Dominion Energy, Inc. and its consolidated subsidiaries
DSM	Demand-side management
Electric Operations	Electric Operations Group operating segment
ELG Rule	Effluent limitations guidelines for the steam electric power generating category
EMANI	European Mutual Association for Nuclear Insurance
EPA	U.S. Environmental Protection Agency
Exchange Act	Securities Exchange Act of 1934, as amended
FERC	Federal Energy Regulatory Commission
FILOT	Fee in lieu of taxes
Fuel Company	South Carolina Fuel Company, Inc.
GAAP	U.S. generally accepted accounting principles
Gas Distribution	Gas Distribution Group operating segment
GENCO	South Carolina Generating Company, Inc.
IAA	Interim Assessment Agreement dated March 28, 2017, as amended, among DESC, Santee Cooper, Westinghouse and WECTEC
MATS	Utility Mercury and Air Toxics Standard Rule
MD&A	Management's Discussion and Analysis of Financial Condition and Results of Operations
MGP	Manufactured gas plant
MW	Megawatt
NEIL	Nuclear Electric Insurance Limited
NOX	Nitrogen oxide
NPDES	National Pollutant Discharge Elimination System
NND Project	V. C. Summer Units 2 and 3 nuclear development project under which SCANA and Santee Cooper undertook to construct two Westinghouse AP1000 Advanced Passive Safety nuclear units in Jenkinsville, South Carolina
Price-Anderson	Price-Anderson Nuclear Industries Indemnity Act

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Abbreviation or Acronym	Definition
Reorganization Plan	Modified Second Amended Joint Chapter 11 Plan of Reorganization, filed by Westinghouse
RICO	Racketeer Influenced and Corrupt Organizations Act
Santee Cooper	South Carolina Public Service Authority
SCANA	The legal entity, SCANA Corporation, one or more of its consolidated subsidiaries (other than DESC) or the entirety of SCANA Corporation and its consolidated subsidiaries
SCANA Combination	Dominion Energy's acquisition of SCANA completed on January 1, 2019 pursuant to the terms of the SCANA Merger Agreement
SCANA Merger Agreement	Agreement and plan of merger entered on January 2, 2018 between Dominion Energy and SCANA
SCANA Merger Approval Order	Final order issued by the South Carolina Commission on December 21, 2018 setting forth its approval of the SCANA Combination
SCDHEC	South Carolina Department of Health and Environmental Control
SCDOR	South Carolina Department of Revenue
SEC	U.S. Securities and Exchange Commission
SO2	Sulfur dioxide
South Carolina Commission	Public Service Commission of South Carolina
Summer	V. C. Summer nuclear power station
Toshiba	Toshiba Corporation, parent company of Westinghouse
Toshiba Settlement	Settlement Agreement dated as of July 27, 2017, by and among Toshiba, DESC and Santee Cooper
VIE	Variable interest entity
WECTEC	WECTEC Global Project Services, Inc. (formerly known as Stone & Webster, Inc.), a wholly-owned subsidiary of Westinghouse
Westinghouse	Westinghouse Electric Company LLC
Westinghouse Subcontractors	Subcontractors and suppliers to the Consortium

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PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Dominion Energy South Carolina, Inc.

Consolidated Balance Sheets

(Unaudited)

(millions)	September 30, 2019			December 31, 2018
ASSETS
Utility plant in service	$	13,056		$	12,803
Accumulated depreciation and amortization		(4,799	)		(4,581	)
Construction work in progress		309			350
Nuclear fuel, net of accumulated amortization		185			211
Utility plant, net ($683 and $711 related to VIEs)		8,751			8,783
Nonutility Property and Investments:
Nonutility property, net of accumulated depreciation		71			72
Assets held in trust, net-nuclear decommissioning		210			190
Other investments		—			1
Nonutility property and investments, net		281			263
Current Assets:
Cash and cash equivalents		11			377
Receivables:
Customer, net of allowance for uncollectible accounts of $8 and $4		335			331
Affiliated and related party		30			359
Other		77			68
Inventories (at average cost):
Fuel		110			89
Materials and supplies		164			158
Prepayments		91			82
Regulatory assets		322			224
Other current assets		23			1
Total current assets ($134 and $96 related to VIEs)		1,163			1,689
Deferred Debits and Other Assets:
Regulatory assets		3,970			4,060
Other		155			168
Total deferred debits and other assets ($34 and $34 related to VIEs)		4,125			4,228
Total assets	$	14,320		$	14,963

See Notes to Consolidated Financial Statements.

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Dominion Energy South Carolina, Inc.

Consolidated Balance Sheets—(Continued)

(Unaudited)

(millions)	September 30, 2019			December 31, 2018
CAPITALIZATION AND LIABILITIES
Common Stock - no par value, 40.3 million shares outstanding	$	3,685		$	2,860
Retained earnings		214			1,279
Accumulated other comprehensive loss		(3	)		(3	)
Total common equity		3,896			4,136
Noncontrolling interest		173			179
Total equity		4,069			4,315
Affiliated long-term debt		230			—
Long-term debt, net		3,378			5,132
Total long-term debt		3,608			5,132
Total capitalization		7,677			9,447
Current Liabilities:
Short-term borrowings		—			73
Current portion of long-term debt		7			14
Accounts payable		151			267
Affiliated and related party payables		795			347
Customer deposits and customer prepayments		71			73
Revenue subject to refund		3			77
Taxes accrued		206			228
Interest accrued		78			72
Regulatory liabilities		308			126
Reserves for litigation and regulatory proceedings		181			11
Other		66			42
Total current liabilities		1,866			1,330
Deferred Credits and Other Liabilities:
Deferred income taxes, net		605			989
Asset retirement obligations		493			542
Pension and other postretirement benefits		205			232
Regulatory liabilities		3,241			2,264
Other		218			143
Other affiliate		15			16
Total deferred credits and other liabilities		4,777			4,186
Commitments and Contingencies (see Note 11)
Total capitalization and liabilities	$	14,320		$	14,963

See Notes to Consolidated Financial Statements.

6

Dominion Energy South Carolina, Inc.

Consolidated Statements of Comprehensive Income (Loss)

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
(millions)	2019			2018			2019			2018
Operating Revenues:
Electric(1)	$	728		$	670		$	869		$	1,770
Gas		67			69			289			304
Total operating revenues		795			739			1,158			2,074
Operating Expenses:
Fuel used in electric generation(1)		167			188			447			503
Purchased power(1)		15			10			35			77
Gas purchased for resale(1)		37			41			158			161
Other operations and maintenance		90			105			309			320
Other operations and maintenance - affiliated suppliers		54			39			174			135
Impairment of assets and other charges		—			—			371			4
Depreciation and amortization		116			81			333			242
Other taxes(1)		55			63			196			192
Total operating expenses		534			527			2,023			1,634
Operating income (loss)		261			212			(865	)		440
Other income (expense), net		(13	)		(1	)		(27	)		124
Interest charges, net of allowance for borrowed funds used during    construction of $2, $2, $4 and $7(1)		66			79			202			232
Income (loss) before income tax expense (benefit)		182			132			(1,094	)		332
Income tax expense (benefit)		40			29			(63	)		70
Net Income (Loss)		142			103			(1,031	)		262
Other Comprehensive Income:
Deferred cost of employee benefit plans, net of tax    of $-, $-, $-, $-		1			1			1			1
Total Comprehensive Income (Loss)		143			104			(1,030	)		263
Comprehensive Income Attributable to Noncontrolling Interest		—			6			14			15
Comprehensive Income (Loss) Available (Attributable) to    Common Shareholder	$	143		$	98		$	(1,044	)	$	248

(1) See Note 14 for amounts attributable to affiliates.

See Notes to Consolidated Financial Statements.

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Dominion Energy South Carolina, Inc.

Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended September 30,
(millions)	2019			2018
Operating Activities
Net income (loss)	$	(1,031	)	$	262
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment of assets and other charges		256			4
Provision for refunds to customers		923			—
Gain on sale of assets		(7	)		—
Deferred income taxes, net		(384	)		93
Depreciation and amortization		341			259
Amortization of nuclear fuel		41			41
Other adjustments		(5	)		(11	)
Changes in certain assets and liabilities:
Receivables		(9	)		49
Receivables - affiliated and related party		(7	)		(4	)
Income tax receivable		—			198
Inventories		(66	)		(15	)
Prepayments		(9	)		(13	)
Regulatory assets		(109	)		2
Regulatory liabilities		223			(102	)
Accounts payable		(68	)		(10	)
Accounts payable - affiliated and related party		7			—
Revenue subject to refund		(74	)		61
Taxes accrued		(22	)		(39	)
Other assets		124			(44	)
Other liabilities		40			38
Net cash provided by operating activities		164			769
Investing Activities
Property additions and construction expenditures		(340	)		(538	)
Proceeds from investments and sales of assets		33			35
Purchase of investments		(42	)		(21	)
Purchase of investments - affiliate		—			(113	)
Proceeds from interest rate derivative contract settlement		—			115
Investment in affiliate, net		336			(108	)
Net cash used in investing activities		(13	)		(630	)
Financing Activities
Proceeds from issuance of debt		—			795
Proceeds from issuance of affiliated debt		230			—
Repayment of long-term debt, including redemption premiums		(1,890	)		(824	)
Dividend to parent		(30	)		(164	)
Contribution from parent		825			20
Contribution returned to parent		(20	)		—
Money pool borrowings, net		441			157
Short-term borrowings, net		(73	)		(79	)
Net cash used in financing activities		(517	)		(95	)
Net increase (decrease) in cash, restricted cash and equivalents		(366	)		44
Cash, restricted cash and equivalents at beginning of period(1)		377			395
Cash, restricted cash and equivalents at end of period(1)	$	11		$	439
Supplemental Cash Flow Information
Noncash investing and financing activities:(2)
Accrued construction expenditures	$	47		$	25
Leases(3)		7			7

(1) At September 30, 2019, September 30, 2018, December 31, 2018 and December 31, 2017 there were no restricted cash and equivalent balances.

(2) See Note 1 for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.

(3)   Includes $3 million of financing leases and $4 million of operating leases for the nine months ended September 30, 2019 and $7 million of capital leases for the nine months ended September 30, 2018.

See Notes to Consolidated Financial Statements.

8

Dominion Energy South Carolina, Inc.

Consolidated Statements of Changes in Common Equity

(Unaudited)

Quarter-To-Date

	Common Stock
(millions)	Shares		Amount		Retained Earnings			AOCI			Noncontrolling Interest			Total Equity
June 30, 2018		40	$	2,860	$	2,060		$	(4	)	$	169		$	5,085
Total comprehensive income available to common shareholder						97			1			6			104
Dividend to parent						(11	)					(6	)		(17	)
September 30, 2018		40	$	2,860	$	2,146		$	(3	)	$	169		$	5,172
June 30, 2019		40	$	3,635	$	72		$	(4	)	$	173		$	3,876
Total comprehensive income available to common shareholder						142			1						143
Capital contribution from parent				50											50
September 30, 2019		40	$	3,685	$	214		$	(3	)	$	173		$	4,069

Year-To-Date

	Common Stock
(millions)	Shares		Amount		Retained Earnings			AOCI			Noncontrolling Interest			Total Equity
December 31, 2017		40	$	2,860	$	1,982		$	(4	)	$	142		$	4,980
Total comprehensive income available to common    shareholder						247			1			15			263
Capital contribution from parent												20			20
Dividend to parent						(83	)					(8	)		(91	)
September 30, 2018		40	$	2,860	$	2,146		$	(3	)	$	169		$	5,172
December 31, 2018		40	$	2,860	$	1,279		$	(3	)	$	179		$	4,315
Cumulative-effect of change in accounting principle						1			(1	)					—
Total comprehensive income (loss) available    (attributable) to common shareholder						(1,045	)		1			14			(1,030	)
Capital contribution from parent				825											825
Capital contribution returned to parent												(20	)		(20	)
Dividend to parent						(20	)								(20	)
Other						(1	)								(1	)
September 30, 2019		40	$	3,685	$	214		$	(3	)	$	173		$	4,069

See Notes to Consolidated Financial Statements.

9

Dominion Energy South Carolina, Inc.

Notes to Consolidated Financial Statements

(Unaudited)

The following notes should be read in conjunction with the Notes to Consolidated Financial Statements appearing in DESC's Annual Report on Form 10-K for the year ended December 31, 2018. DESC filed such annual report on a combined basis with SCANA. Accordingly, the information presented in such notes is presented on a combined basis and therefore some of the information may apply only to SCANA and not DESC. DESC makes no representation as to any such information.

These are interim financial statements and, due to the seasonality of DESC's business and matters that may occur during the rest of the year, the amounts reported in the Consolidated Statements of Comprehensive Income (Loss) are not necessarily indicative of amounts expected for the full year.  In the opinion of management, the information furnished herein reflects all adjustments which are necessary for a fair statement of the results for the interim periods reported, and such adjustments are of a normal recurring nature. In addition, the preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Certain amounts in DESC's 2018 Consolidated Financial Statements and Notes have been reclassified to conform to the 2019 presentation for comparative purposes; however, such reclassifications did not affect DESC's net income (loss) and other comprehensive income (loss), total assets, liabilities, equity or cash flows.

DESC is a wholly-owned subsidiary of SCANA which, effective January 2019, is a wholly-owned subsidiary of Dominion Energy.

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Consolidation and Variable Interest Entities

DESC has determined that it has a controlling financial interest in each of GENCO and Fuel Company (which are considered to be VIEs) and, accordingly, DESC's Consolidated Financial Statements include, after eliminating intercompany balances and transactions, the accounts of DESC, GENCO and Fuel Company. The equity interests in GENCO and Fuel Company are held solely by SCANA, DESC’s parent. As a result, GENCO and Fuel Company’s equity and results of operations are reflected as noncontrolling interest in the Consolidated Financial Statements.

GENCO owns a coal-fired electric generating station with a 605 MW net generating capacity (summer rating). GENCO’s electricity is sold, pursuant to a FERC-approved tariff, solely to DESC under the terms of a power purchase agreement and related operating agreement. The effects of these transactions are eliminated in consolidation. GENCO’s property (carrying value of $501 million) previously served as collateral for its long-term borrowings. In May 2019, GENCO redeemed its 5.49% senior secured notes and was able to release the first mortgage lien in June 2019 that had previously secured these notes. Fuel Company acquires, owns and provides financing for DESC’s nuclear fuel, certain fossil fuels and emission and other environmental allowances. See also Note 5.

Additionally, DESC purchases shared services from DESS, an affiliated VIE that provides accounting, legal, finance and certain administrative and technical services to all SCANA subsidiaries, including DESC. DESC has determined that it is not the primary beneficiary of DESS as it does not have either the power to direct the activities that most significantly impact its economic performance or an obligation to absorb losses and benefits which could be significant to it. See Note 14 for amounts attributable to affiliates.

Significant Accounting Policies

There have been no significant changes from Note 1 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018, with the exception of the item described below.

Leases

DESC leases certain assets including vehicles, real estate, office equipment and other assets under both operating and finance leases. For operating leases, rent expense is recognized on a straight-line basis over the term of the lease agreement, subject to regulatory framework. Rent expense associated with operating leases, short-term leases and variable leases is primarily recorded in other operations and maintenance expense in the Consolidated Statements of Comprehensive Income (Loss). Rent expense associated with finance leases results in the separate presentation of interest expense on the lease liability and amortization expense of the related right-of-use asset in the Consolidated Statements of Comprehensive Income (Loss). Amortization expense and interest charges associated with finance leases are recorded in depreciation and amortization and interest charges, respectively, in the Consolidated Statements of Comprehensive Income (Loss) or deferred within regulatory assets in the Consolidated Balance Sheets.

10

Certain leases include one or more options to renew, with renewal terms that can extend the lease from one to 70 years. The exercise of renewal options is solely at DESC's discretion and is included in the lease term if the option is reasonably certain to be exercised. A right-of-use asset and corresponding lease liability for leases with original lease terms of one year or less are not included in the Consolidated Balance Sheets, unless such leases contain renewal options that DESC is reasonably certain will be exercised.

The determination of the discount rate utilized has a significant impact on the calculation of the present value of the lease liability included in the Consolidated Balance Sheets. For DESC’s leased assets, the discount rate implicit in the lease is generally unable to be determined from a lessee perspective.  As such, DESC uses internally-developed incremental borrowing rates as a discount rate in the calculation of the present value of the lease liability. The incremental borrowing rates are determined based on an analysis of DESC's publicly available secured borrowing rates over various lengths of time that most closely correspond to DESC's lease maturities.

Recently Adopted Accounting Standards

In February 2016, the Financial Accounting Standards Board issued revised accounting guidance for the recognition, measurement, presentation and disclosure of leasing arrangements. The update requires that a liability and corresponding right-of-use asset are recorded on the balance sheet for all leases, including those leases classified as operating leases, while also refining the definition of a lease. In addition, lessees will be required to disclose key information about the amount, timing, and uncertainty of cash flows arising from leasing arrangements. Lessor accounting remains largely unchanged.

The guidance became effective for DESC's interim and annual reporting periods beginning January 1, 2019. DESC adopted this revised accounting guidance using a modified retrospective approach, which requires lessees and lessors to recognize and measure leases at the date of adoption. Under this approach, DESC utilized the transition practical expedient to maintain historical presentation for periods before January 1, 2019. DESC also applied the other practical expedients, which required no reassessment of whether existing contracts are or contain leases, no reassessment of lease classification for existing leases and no evaluation of existing or expired land easements that were not previously accounted for as leases. In connection with the adoption of this revised accounting guidance, DESC recorded $19 million of offsetting right-of-use assets and liabilities for operating leases in effect at the adoption date. See Note 12 for additional information.

2. RATE AND OTHER REGULATORY MATTERS

Regulatory Matters Involving Potential Loss Contingencies

As a result of issues generated in the ordinary course of business, DESC is involved in various regulatory matters. Certain regulatory matters may ultimately result in a loss; however, as such matters are in an initial procedural phase, involve uncertainty as to the outcome of pending reviews or orders, and/or involve significant factual issues that need to be resolved, it is not possible for DESC to estimate a range of possible loss. For regulatory matters that DESC cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the regulatory process such that DESC is able to estimate a range of possible loss. For regulatory matters that DESC is able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any estimated range is based on currently available information, involves elements of judgment and significant uncertainties and may not represent DESC’s maximum possible loss exposure. The circumstances of such regulatory matters will change from time to time and actual results may vary significantly from the current estimate. For current matters not specifically reported below, management does not anticipate that the outcome from such matters would have a material effect on DESC’s financial position, liquidity or results of operations.

FERC

In June 2019, DESC submitted the 2015 Task Order as a stand-alone rate schedule, which governs DESC’s provision of retail service to the DOE at the Savannah River Site. The 2015 Task Order also includes provisions that govern the operations and maintenance of certain transmission facilities, which DESC had determined to be services that are likely subject to FERC’s jurisdiction. DESC requested that FERC accept the 2015 Task Order for filing to become effective in August 2019 and accept the refund analysis included in the filing for amounts collected under the 2015 Task Order as well as under two prior task orders commencing in 1995 and each covering ten-year periods. During the second quarter of 2019, DESC recorded a $6 million ($4 million after-tax) charge primarily within interest charges in DESC’s Consolidated Statements of Comprehensive Income (Loss). In August 2019, DESC submitted a motion to withdraw the 2015 Task Order filing and related refund analysis as requested by FERC staff. As a result, DESC recorded a $10 million ($7 million after-tax) benefit, primarily within interest charges in DESC’s Consolidated Statements of Comprehensive Income (Loss) during the third quarter of 2019, to remove previously recorded reserves.

Electric – BLRA

In July 2018, the South Carolina Commission issued orders implementing a legislatively-mandated temporary reduction in revenues that could be collected by DESC from customers under the BLRA. These orders reduced the portion of DESC’s retail electric rates associated with the NND Project from approximately 18% of the average residential electric customer's bill to approximately 3%,

11

which equates to a reduction in revenues of approximately $31 million per month, retroactive to April 1, 2018. As a result, in the second quarter of 2018 DESC recorded a charge of $109 million ($82 million after-tax) to operating revenues in DESC’s Consolidated Statements of Comprehensive Income (Loss). The temporary rate reduction remained in effect until February 2019 when rates pursuant to the SCANA Merger Approval Order became effective.

Other Regulatory Matters

Other than the following matter, there have been no significant developments regarding the pending regulatory matters disclosed in Note 2 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018 or Note 2 to the Consolidated Financial Statements in DESC’s Quarterly Report on Form 10-Q for the quarters ended March 31, 2019 and June 30, 2019.

Gas

In June 2019, DESC filed with the South Carolina Commission its monitoring report for the 12-month period ended March 31, 2019 with a total revenue requirement of $437 million. This represents a $7 million overall increase to its natural gas rates under the terms of the Natural Gas Rate Stabilization Act effective for the rate year beginning November 2019. In October 2019, the South Carolina Commission approved a total revenue requirement of $436 million effective with the first billing cycle of November 2019.

12

Regulatory Assets and Regulatory Liabilities

Rate-regulated utilities recognize in their financial statements certain revenues and expenses in different periods than do other enterprises. As a result, DESC has recorded regulatory assets and regulatory liabilities which are summarized in the following table. Except for NND Project costs and certain other unrecovered plant costs, substantially all regulatory assets are either explicitly excluded from rate base or are effectively excluded from rate base due to their being offset by related liabilities.

	September 30,		December 31,
(millions)	2019		2018
Regulatory assets:
NND Project costs	$	138	$	127
Income taxes recoverable through future rates		52		—
Deferred employee benefit plan costs		13		16
Other unrecovered plant		14		14
DSM programs		16		14
Other		89		53
Regulatory assets - current		322		224
NND Project costs		2,537		2,641
AROs		315		380
Cost of reacquired debt		271		14
Deferred employee benefit plan costs		205		256
Deferred losses on interest rate derivatives		310		442
Other unrecovered plant		70		79
DSM programs		53		51
Environmental remediation costs		21		24
Deferred storm damage costs		43		35
Deferred transmission operating costs		32		15
Other		113		123
Regulatory assets - noncurrent		3,970		4,060
Total regulatory assets	$	4,292	$	4,284
Regulatory liabilities:
Monetization of guaranty settlement	$	67	$	61
Income taxes refundable through future rates		—		52
Reserve for refunds to electric utility customers		215		—
Other		26		13
Regulatory liabilities - current		308		126
Monetization of guaranty settlement		987		1,037
Income taxes refundable through future rates		912		607
Asset removal costs		554		541
Deferred gains on interest rate derivatives		72		75
Reserve for refunds to electric utility customers		707		—
Other		9		4
Regulatory liabilities - noncurrent		3,241		2,264
Total regulatory liabilities	$	3,549	$	2,390

Regulatory assets have been recorded based on the probability of their recovery. All regulatory assets represent incurred costs that may be deferred under GAAP for regulated operations. The South Carolina Commission or the FERC has reviewed and approved through specific orders certain of the items shown as regulatory assets. In addition, regulatory assets include, but are not limited to, certain costs which have not been specifically approved for recovery by one of these regulatory agencies, including deferred transmission operating costs that are the subject of regulatory proceedings discussed in Note 11. While such costs are not currently being recovered, management believes they would be allowable under existing rate-making concepts embodied in rate orders or applicable state law and expects to recover these costs through rates in future periods. In the future, as a result of deregulation, changes in state law, other changes in the regulatory environment or changes in accounting requirements or other adverse legislative or regulatory developments, DESC could be required to write off all or a portion of its regulatory assets and liabilities. Such an event could have a material effect on DESC's Consolidated Financial Statements in the period the write-off would be recorded.

NND Project costs reflects expenditures associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from electric service customers over a 20-year period ending in 2039. See also Note 11.

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AROs represent deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 106 years.

Employee benefit plan costs have historically been recovered as they have been recorded under GAAP.  Deferred employee benefit plan costs represent amounts of pension and other postretirement benefit costs which were accrued as liabilities and treated as regulatory assets pursuant to FERC guidance, and costs deferred pursuant to specific South Carolina Commission regulatory orders. DESC expects to recover deferred pension costs through utility rates over periods through 2044. DESC expects to recover other deferred benefit costs through utility rates, primarily over average service periods of participating employees up to 11 years.

Deferred losses or gains on interest rate derivatives represent (i) the changes in fair value and payments made or received upon settlement of certain interest rate derivatives designated as cash flow hedges and (ii) the changes in fair value and payments made or received upon settlement of certain other interest rate derivatives not so designated.  The amounts recorded with respect to (i) are expected to be amortized to interest expense over the lives of the underlying debt through 2043. The amounts recorded with respect to (ii) are expected to be similarly amortized to interest expense through 2065.

Other unrecovered plant represents the carrying value of coal-fired generating units, including related materials and supplies inventory, retired from service prior to being fully depreciated. DESC is amortizing these amounts through cost of service rates over the units' previous estimated remaining useful lives through 2025. Unamortized amounts are included in rate base and are earning a current return.

DSM programs represent deferred costs associated with electric demand reduction programs, and such deferred costs are currently being recovered over five years through an approved rate rider.

Environmental remediation costs are associated with the assessment and clean-up of sites currently or formerly owned by DESC. Such remediation costs are expected to be recovered over periods of up to 16 years. See also Note 11.

Deferred storm damage costs represent storm restoration costs for which DESC expects to receive future recovery through customer rates.

Deferred transmission operating costs includes deferred depreciation and property taxes associated with certain transmission assets for which DESC expects recovery from customers through future rates. See also Note 11.

Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be remaining life of the reacquired debt. The reacquired debt costs had a weighted-average life of approximately 26 years as of September 30, 2019.

Various other regulatory assets are expected to be recovered through rates over varying periods through 2047.

Monetization of guaranty settlement represents proceeds related to the monetization of the Toshiba Settlement. In accordance with the SCANA Merger Approval Order, this balance, net of amounts that may be required to satisfy certain liens, will be refunded to electric customers over a 20-year period ending in 2039. See also Note 11.

Income taxes recoverable/refundable through future rates includes (i) excess deferred income taxes arising from the remeasurement of deferred income taxes in connection with the enactment of the 2017 Tax Reform Act (certain of which are protected under normalization rules and will be amortized over the remaining lives of related property, and certain of which will be amortized to the benefit of customers over prescribed periods as instructed by regulators) and (ii) deferred income taxes arising from investment tax credits, offset by (iii) deferred income taxes that arise from utility operations that have not been included in customer rates (a portion of which relate to depreciation and are expected to be recovered over the remaining lives of the related property which may range up to 85 years). See also Note 6.

Reserve for refunds to electric utility customers reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited to customers over an estimated 11-year period in connection with the SCANA Merger Approval Order. See also Note 11.

Asset removal costs represent estimated net collections through depreciation rates of amounts to be expended for the removal of assets in the future. 

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3. REVENUE RECOGNITION

DESC has disaggregated operating revenues by customer class as follows:

	Three Months Ended				Three Months Ended				Nine Months Ended				Nine Months Ended
	September 30, 2019				September 30, 2018				September 30, 2019				September 30, 2018
(millions)	Electric		Gas		Electric		Gas		Electric		Gas		Electric		Gas
Customer class:
Residential	$	354	$	24	$	310	$	25	$	364	$	133	$	805	$	145
Commercial		229		19		231		19		296		80		571		80
Industrial		101		18		95		19		119		63		286		64
Other		37		6		31		6		82		13		99		13
Revenues from contracts with    customers		721		67		667		69		861		289		1,761		302
Other revenues		7		—		3		—		8		—		9		1
Total Operating Revenues	$	728	$	67	$	670	$	69	$	869	$	289	$	1,770	$	303

Contract liabilities represent the obligation to transfer goods or services to a customer for which consideration has already been received from the customer. DESC had contract liability balances of $5 million and $4 million at September 30, 2019 and December 31, 2018, respectively. During the nine months ended September 30, 2019, DESC recognized revenue of $3 million from the beginning contract liability balances as DESC fulfilled its obligations to provide service to its customers. Contract liabilities are recorded in customer deposits and customer prepayments in the Consolidated Balance Sheets.

4. EQUITY

For all periods presented, DESC's authorized shares of common stock, no par value, were 50 million, of which 40.3 million were issued and outstanding, and DESC's authorized shares of preferred stock, no par value, were 20 million, of which 1,000 shares were issued and outstanding. All outstanding shares of common and preferred stock are held by SCANA.

In February 2019, DESC received an equity contribution of $675 million from its parent that was funded by Dominion Energy. DESC used these funds to redeem long-term debt. See Note 5.

In June 2019, DESC received an equity contribution of $100 million from its parent that was funded by Dominion Energy. DESC used these funds to repay intercompany credit agreement borrowings from Dominion Energy.

In September 2019, DESC received an equity contribution of $50 million from its parent that was funded by Dominion Energy. DESC used these funds to redeem long-term debt. See Note 5.

DESC’s bond indenture under which it issues first mortgage bonds contains provisions that could limit the payment of cash dividends on its common stock. DESC's bond indenture permits the payment of dividends on DESC's common stock only either (1) out of its Surplus (as defined in the bond indenture) or (2) in case there is no Surplus, out of its net profits for the fiscal year in which the dividend is declared and/or the preceding fiscal year. In addition, the Federal Power Act requires the appropriation of a portion of certain earnings from hydroelectric projects. At both September 30, 2019 and December 31, 2018, retained earnings of $115 million were restricted by this requirement as to payment of cash dividends on DESC’s common stock. In addition, pursuant to the SCANA Merger Approval Order, the amount of any DESC dividends paid must be reasonable and consistent with the long-term payout ratio of the electric utility industry and gas distribution industry.

5. LONG-TERM AND SHORT-TERM DEBT AND LIQUIDITY

Long-term Debt

In February 2019, DESC launched tender offers for certain of its first mortgage bonds pursuant to which it purchased first mortgage bonds having an aggregate purchase price equal to $1.2 billion. DESC incurred a loss on reacquired debt of $187 million in connection with these tender offers, which is recorded in regulatory assets on the Consolidated Balance Sheets.

In August 2019, DESC launched a tender offer for certain of its first mortgage bonds pursuant to which it purchased first mortgage bonds having an outstanding principal balance equal to $552 million. DESC incurred a net loss on reacquired debt of $83 million in connection with this tender offer, which is recorded in regulatory assets on the Consolidated Balance Sheets.

Long-term Debt - Affiliate

In May 2019, GENCO issued a $230 million 3.05% promissory note due to Dominion Energy that matures in May 2024. The issuance by GENCO was approved by the South Carolina Commission. Proceeds from the issuance were used to redeem GENCO’s 5.49%

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senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest, repay money pool borrowings and to return $20 million of contributed equity capital to SCANA.

Liquidity

In March 2019, DESC became a co-borrower under Dominion Energy's $6 billion joint revolving credit facility. DESC's short-term financing is supported through its access to this joint revolving credit facility, which can be used for working capital, as support for the combined commercial paper programs of DESC, Dominion Energy and certain other of its subsidiaries (co-borrowers), and for other general corporate purposes.

DESC's share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, were as follows:

(millions)	Facility Limit		Outstanding Commercial Paper		Outstanding Letters of Credit
At September 30, 2019	$	1,000	$	—	$	—

A maximum of $1.0 billion of the facility is available to DESC, less any amounts outstanding to co-borrowers. A sub-limit for DESC is set within the facility limit but can be changed at the option of the co-borrowers multiple times per year. At September 30, 2019, the sub-limit for DESC was $500 million. If DESC has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term borrowings from DESC's parent or from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.0 billion (or the sub-limit, whichever is less) of letters of credit.

Also in March 2019, DESC canceled its previous committed long-term facility which was a revolving line of credit under a credit agreement with a syndicate of banks. This previous credit agreement was used for general corporate purposes, including liquidity support for DESC's commercial paper program and working capital needs, and was set to expire in December 2020.

(millions)	Facility Limit(1)		Outstanding Commercial Paper		Outstanding Letters of Credit
At December 31, 2018	$	1,200	$	73	$	—

(1) Included $500 million related to Fuel Company. In February 2019, Fuel Company's commercial paper program and its credit facility were terminated.

The weighted-average interest rate of the outstanding commercial paper supported by this credit facility was 3.82% at December 31, 2018.

In April 2019, DESC renewed its FERC authority to issue short-term indebtedness (pursuant to Section 204 of the Federal Power Act). DESC may issue unsecured promissory notes, commercial paper and direct loans in amounts not to exceed $2.2 billion outstanding with maturity dates of one year or less. In addition, in April 2019, GENCO renewed its FERC authority to issue short-term indebtedness not to exceed $200 million outstanding with maturity dates of one year or less. The authorities described herein will expire in April 2020, which reflects a one-year authorization period rather than the two-year period DESC and GENCO had requested. In granting the authorization for a shorter period, FERC cited certain regulatory and legislative proceedings at the state level, as well as certain legal proceedings, arising from the NND Project that could affect DESC's and GENCO's circumstances. Were adverse developments to occur with respect to these uncertainties, the ability of DESC or GENCO to secure renewal of this short-term borrowing authority may be adversely impacted.

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DESC is obligated with respect to an aggregate of $68 million of industrial revenue bonds which are secured by letters of credit issued by TD Bank N.A. These letters of credit expire, subject to renewal, in the fourth quarter of 2019.

DESC received FERC approval to enter into an inter-company credit agreement in April 2019 with Dominion Energy under which DESC may have short-term borrowings outstanding up to $900 million. At September 30, 2019, DESC had borrowings outstanding under this credit agreement totaling $501 million, which are recorded in affiliated and related party payables in DESC’s Consolidated Balance Sheets. For both the three and nine months ended September 30, 2019, DESC recorded interest charges of $1 million.

DESC participated in a utility money pool with SCANA and another regulated subsidiary of SCANA through April 2019. Fuel Company and GENCO remain in the utility money pool. Money pool borrowings and investments bear interest at short-term market rates. For the three and nine months ended September 30, 2019, DESC recorded interest income from money pool transactions of $1 million and $7 million, respectively, and for the same periods DESC recorded interest expense from money pool transactions of $1 million and $7 million, respectively. For the three and nine months ended September 30, 2018, DESC recorded interest income from money pool transactions of $1 million and $2 million, respectively, and for the same periods DESC recorded interest expense from money pool transactions of $1 million and $2 million, respectively. DESC had outstanding money pool borrowings due to an affiliate of $222 million and investments due from an affiliate of $17 million at September 30, 2019. At December 31, 2018, DESC had outstanding money pool borrowings due to an affiliate of $282 million and investments due from an affiliate of $353 million. On its Consolidated Balance Sheets, DESC includes money pool borrowings within affiliated and related party payables and money pool investments within affiliated and related party receivables.

6. INCOME TAXES

DESC’s effective tax rate for the nine months ended September 30, 2019 is 5.7% compared to 21.1% for the nine months ended September 30, 2018. Variances in the effective tax rate are primarily driven by charges resulting from the SCANA Combination. In connection with the SCANA Merger Approval Order, Dominion Energy committed to forgo, or limit, the recovery of certain income tax-related regulatory assets associated with the NND Project. DESC's effective tax rate reflects income tax expense of $198 million in satisfaction of this commitment.

In the first quarter, DESC’s unrecognized tax benefits increased by $51 million and income tax expense increased by $40 million related to a state income tax position taken in prior years. In the second quarter, DESC’s unrecognized tax benefits increased by $24 million and income tax expense increased by $23 million primarily related to a federal income tax position taken in prior years. In the third quarter, DESC’s unrecognized tax benefits decreased by $5 million and income tax expense decreased by $4 million associated with refinements of estimates on a state income tax position taken in prior years.  In addition, DESC accrued interest and penalties of $12 million ($9 million after-tax) and $7 million ($7 million after-tax), respectively, on unrecognized tax benefits in the current quarter.

As of September 30, 2019, there have been no other material changes in DESC’s unrecognized tax benefits. See Note 6 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018 for a discussion of these unrecognized tax benefits and potential changes due to the SCANA Combination.

DESC has significant federal and state net operating loss carryforward-related deferred tax assets where the utilization of these tax benefits may be limited in future periods due to the SCANA Combination. For the period ended September 30, 2019, DESC has concluded a valuation allowance is not required on these deferred tax assets. If DESC concludes a valuation allowance is required in future periods, the impact could be material.

The 2017 Tax Reform Act limits the deductibility of interest expense to 30% of adjusted taxable income for certain businesses, with any disallowed interest carried forward indefinitely. Subject to additional guidance in yet to be finalized regulations, DESC expects its interest expense to be deductible in 2019.

7. DERIVATIVE FINANCIAL INSTRUMENTS

DESC’s accounting policies, objectives, and strategies for using derivative instruments are discussed in Note 7 in the Consolidated Financial Statements in DESC’s Annual Report on Form 10-K for the year ended December 31, 2018. Derivative assets and liabilities are presented gross on the Consolidated Balance Sheets and are measured at fair value. See Note 8 for further information about fair value measurements and associated valuation methods for derivatives. Derivative contracts include over-the-counter transactions, which are bilateral contracts that are transacted directly with a third party. In general, most over-the-counter transactions are subject to collateral requirements.

Pursuant to regulatory orders, interest rate derivatives entered into by DESC after October 2013 have not been designated for accounting purposes as cash flow hedges, and fair value changes and settlement amounts related to them have been recorded as regulatory assets and liabilities. Settlement losses on swaps generally have been amortized over the lives of subsequent debt issuances,

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and gains have been amortized to interest expense or have been applied as otherwise directed by the South Carolina Commission. See Note 15 regarding the settlement gains realized in the first quarter of 2018.

The table below presents derivative balances by type of financial instrument, if the gross amounts recognized in the Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid:

	September 30, 2019								December 31, 2018
	Gross Amounts Not Offset in the Consolidated Balance Sheet								Gross Amounts Not Offset in the Consolidated Balance Sheet
(millions)	Gross Liabilities Presented in the Consolidated Balance Sheet		Financial Instruments		Cash Collateral Paid		Net Amounts		Gross Liabilities Presented in the Consolidated Balance Sheet		Financial Instruments		Cash Collateral Paid		Net Amounts
Interest rate contracts:
Over-the-counter	$	23	$	—	$	23	$	—	$	11	$	—	$	11	$	—
Total derivatives	$	23	$	—	$	23	$	—	$	11	$	—	$	11	$	—

Volumes

The following table presents the volume of derivative activity at September 30, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions.

	Current		Noncurrent
Interest rate(1)	$	—	$	71,400,000

(1) Maturity is determined based on final settlement period.

Fair Value and Gains and Losses on Derivative Instruments

The following tables present the fair values of derivatives and where they are presented in the Consolidated Balance Sheets:

(millions)	Fair Value - Derivatives under Hedge Accounting		Fair Value - Derivatives not under Hedge Accounting		Total Fair Value
At September 30, 2019
Current Liabilities
Interest rate	$	1	$	1	$	2
Total current derivative liabilities(1)		1		1		2
Noncurrent Liabilities
Interest rate		13		8		21
Total noncurrent derivative liabilities(2)		13		8		21
Total derivative liabilities	$	14	$	9	$	23
At December 31, 2018
Current Liabilities
Interest rate	$	1	$	—	$	1
Total current derivative liabilities(1)		1		—		1
Noncurrent Liabilities
Interest rate		7		3		10
Total noncurrent derivative liabilities(2)		7		3		10
Total derivative liabilities	$	8	$	3	$	11

(1) Current derivative liabilities are presented in other current liabilities in the Consolidated Balance Sheets.

(2) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Consolidated Balance Sheets.

The following tables present the gains and losses on derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Comprehensive Income (Loss):

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Derivatives in Cash Flow Hedging Relationships

(millions)	Gain (loss) Reclassified from Deferred Accounts into Income			Increase (Decrease) in Derivatives Subject to Regulatory Treatment(1)
Three Months Ended September 30, 2019
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	(1	)
Total	$	—		$	(1	)
Three Months Ended September 30, 2018
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	—
Total	$	—		$	—
Nine Months Ended September 30, 2019
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	(3	)
Total	$	—		$	(3	)
Nine Months Ended September 30, 2018
Derivative type and location of gains (losses):
Interest rate(2)	$	(1	)	$	2
Total	$	(1	)	$	2

(1) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/ liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

(2) Amounts recorded in DESC’s Consolidated Statements of Comprehensive Income (Loss) are classified in interest charges.

Derivatives Not designated as Hedging Instruments

(millions)	Increase (Decrease) in Derivatives Subject to Regulatory Treatment(1)						Amount of Gain (Loss) Recognized in Income on Derivatives(2)
Three Months Ended September 30,	2019			2018		Location	2019			2018
Derivative type and location of gains (losses):
Interest rate contracts:						Interest charges	$	(1	)	$	(1	)
Total interest rate contracts	$	(2	)	$	1		$	(1	)	$	(1	)
Nine Months Ended September 30,
Derivative type and location of gains (losses):
Interest rate contracts:						Interest charges	$	(1	)	$	(2	)
						Other income		—			115
Total interest rate contracts	$	(5	)	$	66		$	(1	)	$	113

(1) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

(2) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

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Credit Risk Considerations

Certain derivative contracts contain contingent credit features. These features may include (i) material adverse change clauses or payment acceleration clauses that could result in immediate payments or (ii) the posting of letters of credit or termination of the derivative contract before maturity if specific events occur, such as a credit rating downgrade below investment grade or failure to post collateral.

Derivative Contracts with Credit Contingent Features

(millions)	September 30, 2019		December 31, 2018
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	23	$	11
Fair value of collateral already posted		23		11
Additional cash collateral or letters of credit in the event credit-risk-related    contingent features were triggered	$	—	$	—

8. FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. Fair values are based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations. This includes not only the credit standing of counterparties involved and the impact of credit enhancements but also the impact of DESC’s own nonperformance risk on their liabilities. Fair value measurements assume that the transaction occurs in the principal market for the asset or liability (the market with the most volume and activity for the asset or liability from the perspective of the reporting entity), or in the absence of a principal market, the most advantageous market for the asset or liability (the market in which the reporting entity would be able to maximize the amount received or minimize the amount paid). DESC applies fair value measurements to interest rate assets and liabilities. DESC’s interest rate swap agreements are valued using discounted cash flow models with independently sourced data. DESC applies credit adjustments to its derivative fair values in accordance with the requirements described above.

Inputs and Assumptions

Fair value is based on actively-quoted market prices, if available. In the absence of actively-quoted market prices, price information is sought from external sources, including industry publications, and to a lesser extent, broker quotes. When evaluating pricing information, DESC considers the ability to transact at the quoted price. Periodically, inputs to valuation models are reviewed and revised as needed, based on historical information, updated market data, market liquidity and relationships, and changes in third-party sources.

The inputs and assumptions used in measuring fair value for interest rate derivative contracts include the following:

• Interest rate curves

• Credit quality of counterparties and DESC

• Notional value

• Credit enhancements

• Time value

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Levels

DESC utilizes the following fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels:

• Level 1-Quoted prices (unadjusted) in active markets for identical assets and liabilities that they have the ability to access at the measurement date.  

• Level 2-Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived from observable market data by correlation or other means. Instruments categorized in Level 2 include interest rate swaps.

• Level 3-Unobservable inputs for the asset or liability, including situations where there is little, if any, market activity for the asset or liability.

The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. In these cases, the lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability.

Recurring Fair Value Measurements

Fair value measurements are separately disclosed by level within the fair value hierarchy.

All of DESC's interest rate swap agreements were in a liability position for all periods presented. Such agreements are valued using discounted cash flow models with independently sourced data, and are considered to be Level 2 fair value measurements. The fair value of these derivatives at September 30, 2019 was $23 million, and at December 31, 2018 was $11 million.

Fair Value of Financial Instruments

Substantially all of DESC’s financial instruments are recorded at fair value, with the exception of the instruments described below, which are reported at historical cost. Estimated fair values have been determined using available market information and valuation methodologies considered appropriate by management. The carrying amount of financial instruments classified within current assets and current liabilities are representative of fair value because of the short-term nature of these instruments. For financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows:

	September 30, 2019				December 31, 2018
(millions)	Carrying Amount		Estimated Fair Value(1)		Carrying Amount		Estimated Fair Value(2)
Long-term debt(3)	$	3,615	$	4,601	$	5,146	$	5,470

(1) Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

(2) Fair value is estimated based on net present value calculations using independently sourced market data that incorporate a developed discount rate using similarly rated long-term debt, along with benchmark interest rates. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

(3) Carrying amount includes amounts which represent the unamortized debt issuance costs and discount or premium.

9. UTILITY PLANT AND NONUTILITY PROPERTY

Sale of Warranty Service Contract Assets

In May 2019, DESC entered into an agreement to sell certain warranty service contract assets for total consideration of $7 million. The transaction closed in August 2019, resulting in a $7 million ($5 million after-tax) gain recorded in other income (expense), net in DESC’s Consolidated Statements of Comprehensive Income (Loss). Pursuant to the agreement, upon closing DESC entered into a commission agreement with the buyer under which the buyer will compensate DESC in connection with the right to use DESC’s brand in marketing materials and other services over a ten-year term.

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Jointly Owned Utility Plant

DESC jointly owns and is the operator of Summer. Each joint owner provides its own financing and shares the direct expenses and generation output in proportion to its ownership. DESC’s share of the direct expenses in Summer is 66.7%. In May 2019, DESC and Santee Cooper entered into an agreement in which DESC agreed to purchase 11.7% of Santee Cooper’s ownership interest in the NND Project nuclear fuel, which will be used at Summer, for $8 million to true up the ownership percentage from the 55% ownership percentage that was applicable for the NND Project to the 66.7% ownership percentage applicable for Summer.

10. EMPLOYEE BENEFIT PLANS

Components of net periodic benefit cost recorded by DESC were as follows:

(millions)	Pension Benefits						Other Postretirement Benefits
Three Months Ended September 30,	2019			2018			2019		2018
Service cost	$	4		$	5		$	1	$	1
Interest cost		6			7			2		2
Expected return on assets		(11	)		(12	)		—		—
Amortization of actuarial losses (gains)		2			3			—		(1	)
Settlement loss(1)		11			—			—		—
Net periodic benefit cost	$	12		$	3		$	3	$	2
Nine Months Ended September 30,
Service cost	$	11		$	13		$	2	$	3
Interest cost		21			22			6		6
Expected return on assets		(31	)		(36	)		—		—
Amortization of actuarial losses		9			8			—		—
Curtailment(1)		6			—			3		—
Settlement loss(1)		11			—			—		—
Net periodic benefit cost	$	27		$	7		$	11	$	9

(1) Related to a voluntary retirement program.

No significant contribution to the pension trust is expected for the remainder of 2019 based on current market conditions and assumptions, nor is a limitation on benefit payments expected to apply. DESC recovers current pension costs through either a rate rider that may be adjusted annually for retail electric operations or through cost of service rates for gas operations.

Voluntary Retirement Program

In March 2019, Dominion Energy announced a voluntary retirement program to employees, including employees of DESC, that meet certain age and service requirements. The voluntary retirement program will not compromise safety or DESC’s ability to comply with applicable laws and regulations. In the second quarter of 2019, upon the determinations made concerning the number of employees that elected to participate in the program, DESC recorded a charge of $62 million ($47 million after-tax), of which $50 million was included within other operations and maintenance expense, $3 million within other taxes and $9 million within other income (expense), net. In addition, as a result of the voluntary retirement program, DESC recorded pension plan settlement losses of $11 million within other income (expense), net in the third quarter of 2019. DESC expects to recognize additional pension plan settlement losses in the fourth quarter of 2019. While DESC is currently unable to estimate the amount of such additional settlement losses, they could be material to its results of operations and financial condition.

In the second quarter of 2019, DESC remeasured its pension and other postretirement benefit plans as a result of the voluntary retirement program.  The remeasurement resulted in an increase in the pension benefit obligation of $16 million and an increase in the accumulated postretirement benefit obligation of $10 million. In addition, the remeasurement resulted in an increase in the fair value of pension plan assets of $27 million. The impact of the remeasurement on net periodic benefit cost was recognized prospectively from the remeasurement date. The remeasurement is expected to increase the net periodic benefit cost for 2019 by approximately $1 million, excluding the impacts of curtailments. The discount rate used for the remeasurement was 4.07% for the pension plan and 4.08% for the other postretirement benefit plan. All other assumptions used for the remeasurement were consistent with the measurement as of December 31, 2018.  

In the third quarter of 2019, DESC remeasured a pension plan as a result of a settlement from the voluntary retirement program. The settlement and related remeasurement resulted in an increase in the pension benefit obligation of $25 million and an increase in the fair value of the pension plan assets of $35 million for DESC. The impact of the remeasurement on net periodic benefit cost (credit) was recognized prospectively from the remeasurement date. The remeasurement is expected to decrease the net periodic benefit cost

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for 2019 by $4 million. The discount rate used for the remeasurement was 3.57%. All other assumptions used for the remeasurement were consistent with the measurement as of December 31, 2018.  

11. COMMITMENTS AND CONTINGENCIES

As a result of issues generated in the ordinary course of business, DESC is involved in legal proceedings before various courts and is periodically subject to governmental examinations (including by regulatory authorities), inquiries and investigations. Certain legal proceedings and governmental examinations involve demands for unspecified amounts of damages, are in an initial procedural phase, involve uncertainty as to the outcome of pending appeals or motions, or involve significant factual issues that need to be resolved, such that it is not possible for DESC to estimate a range of possible loss. For such matters that DESC cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the litigation or investigative processes such that DESC is able to estimate a range of possible loss. For legal proceedings and governmental examinations that DESC is able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any accrued liability is recorded on a gross basis with a receivable also recorded for any probable insurance recoveries. Estimated ranges of loss are inclusive of legal fees and net of any anticipated insurance recoveries. Any estimated range is based on currently available information and involves elements of judgment and significant uncertainties. Any estimated range of possible loss may not represent DESC’s maximum possible loss exposure. The circumstances of such legal proceedings and governmental examinations will change from time to time and actual results may vary significantly from the current estimate. For current proceedings not specifically reported below, management does not anticipate that the liabilities, if any, arising from such proceedings would have a material effect on DESC’s financial position, liquidity or results of operations.

Environmental

In July 2019, the EPA published the ACE Rule, which repeals and replaces the Clean Power Plan. The ACE Rule became effective in September 2019. The final ACE Rule applies to coal-fired steam electric generating units greater than or equal to 25 MW. The rule includes unit-specific performance standards based on the degree of emission reduction levels achievable from unit efficiency improvements to be determined by the permitting agency. The ACE Rule requires states to develop plans by July 2022 to implement these performance standards, which plans must be approved by the EPA by January 2024. DESC is currently evaluating the ACE Rule for potential impact at its coal fired units and expects any costs incurred to comply with such rule to be recoverable through rates. While the impacts of this rule could be material to DESC’s results of operations, financial condition and/or cash flows, the existing regulatory framework in South Carolina provides rate recovery mechanisms that could substantially mitigate any such impacts.

In July 2011, the EPA issued the CSAPR to reduce emissions of SO₂ and NO_X from power plants in the eastern half of the U.S. The CSAPR replaces the Clean Air Interstate Rule and requires a total of 28 states to reduce annual SO₂ emissions and annual ozone season NO_X emissions to assist in attaining the ozone and fine particle National Ambient Air Quality Standards. The rule establishes an emissions cap for SO₂ and NO_X and limits the trading for emission allowances by separating affected states into two groups with no trading between the groups. The State of South Carolina has chosen to remain in the CSAPR program, even though recent court rulings exempted the state. This allows the state to remain compliant with regional haze standards. Air quality control installations that DESC has already completed have positioned them to comply with the existing allowances set by the CSAPR. Any costs incurred to comply with CSAPR are expected to be recoverable through rates.

In February 2019, the EPA published a proposed rule to reverse its previous finding that it is appropriate and necessary to regulate toxic emissions from power plants. However, the emissions standards and other requirements of the MATS rule would remain in place as the EPA is not proposing to remove coal and oil fired power plants from the list of sources that are regulated under MATS. Although litigation of the MATS rule and the outcome of the EPA’s rulemaking are still pending, the regulation remains in effect and DESC is complying with the applicable requirements of the rule and does not expect any adverse impacts to its operations at this time due to plant retirements, conversions and enhancements.

The CWA provides for the imposition of effluent limitations that require treatment for wastewater discharges. Under the CWA, compliance with applicable limitations is achieved under state-issued NPDES permits such that, as a facility’s NPDES permit is renewed, any new effluent limitations would be incorporated. The ELG Rule was final in September 2015, after which state regulators are required to modify facility NPDES permits to match more restrictive standards, which would require facilities to retrofit with new wastewater treatment technologies. Compliance dates varied by type of wastewater, and some were based on a facility's five-year permit cycle and thus could range from 2018 to 2023. However, the ELG Rule is under reconsideration by the EPA and has been stayed administratively. The EPA has decided to conduct a new rulemaking that could result in revisions to certain flue gas desulfurization wastewater and bottom ash transport water requirements in the ELG Rule. Accordingly, in September 2017 the EPA finalized a rule that postpones compliance dates under the ELG Rule to a range from November 2020 to December 2023. The EPA indicates that the new rulemaking process may take up to three years to complete, such that any revisions to the ELG Rule likely would not be final until the summer of 2020. While DESC expects that wastewater treatment technology retrofits will be required at Williams and Wateree generating stations, any costs incurred to comply with the ELG Rule are expected to be recoverable through rates.

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The CWA Section 316(b) Existing Facilities Rule became effective in October 2014. This rule establishes national requirements for the location, design, construction and capacity of cooling water intake structures at existing facilities that reflect the best technology available for minimizing the adverse environmental impacts of impingement and entrainment. DESC is conducting studies and implementing plans as required by the rule to determine appropriate intake structure modifications at certain facilities to ensure compliance with this rule. Any costs incurred to comply with this rule are expected to be recoverable through rates.

The EPA's final rule for CCR became effective in the fourth quarter of 2015. This rule regulates CCR as a non-hazardous waste under Subtitle D of the Resource Conservation and Recovery Act and imposes certain requirements on ash storage ponds and other CCR management facilities at certain of DESC's coal-fired generating facilities. DESC has already closed or has begun the process of closure of all of its ash storage ponds and has previously recognized AROs for such ash storage ponds under existing requirements. DESC does not expect the incremental compliance costs associated with this rule to be significant and expect to recover such costs in future rates.

DESC is responsible for four decommissioned MGP sites in South Carolina which contain residues of by-product chemicals. These sites are in various stages of investigation, remediation and monitoring under work plans approved by or under review by SCDHEC and the EPA. DESC anticipates that major remediation activities at all of these sites will continue at least through 2022 and will cost an additional $10 million. In February 2019, SCDHEC directed DESC to pursue a stakeholder-developed modified removal action plan for one site (Congaree River). DESC is developing an engineering design for this plan, which would require permits from the U.S. Army Corps of Engineers and others and further approvals before it could be implemented. If DESC receives the necessary permits and approvals for this plan, remediation cost for the Congaree River site would increase by $8 million. DESC cannot predict if or when such permits or approvals will be received. Major remediation activities are accrued in other within deferred credits and other liabilities on the Consolidated Balance Sheets. DESC expects to recover any cost arising from the remediation of MGP sites through rates. At September 30, 2019, deferred amounts, net of amounts previously recovered through rates and insurance settlements, totaled $23 million and are included in regulatory assets.

Abandoned NND Project

A description of events and circumstances leading up to DESC's abandonment of the NND Project and subsequent regulatory, legislative, legal and investigative proceedings, as well as related impairments of NND Project and other costs are described in Note 11 in DESC's Annual Report on Form 10-K for the year ended December 31, 2018.

SCANA Merger Approval Order

In accordance with the terms of the South Carolina Commission's SCANA Merger Approval Order, DESC adopted the Plan-B Levelized Customer Benefits Plan, effective February 2019, whereby the average bill for a DESC residential electric customer approximates that which resulted from the legislatively-mandated temporary reduction that had been put into effect by the South Carolina Commission in August 2018. DESC also recorded a significant impairment charge in the fourth quarter of 2018, which charge resulted from its conclusion that NND Project capital costs exceeding the amount established in the SCANA Merger Approval Order were probable of loss, regardless of whether the SCANA Combination was completed. In addition, in the first quarter of 2019, DESC recorded the following charges and liabilities which arose from or are related to provisions in the SCANA Merger Approval Order.

• A charge of $105 million ($79 million after-tax) related to certain assets that had been constructed in connection with the NND Project for which DESC committed to forgo recovery.

• A regulatory liability for refunds and restitution of amounts previously collected from retail electric customers of $1.0 billion ($756 million after-tax), recorded as a reduction in operating revenue, which will be credited to customers over an estimated 11 years. In addition, a previously existing regulatory liability of $1.0 billion will be credited to customers over 20 years, which reflects amounts to be refunded to customers related to the monetization of guaranty settlement described in Note 2.

• A regulatory liability for refunds to natural gas customers totaling $2 million ($2 million after-tax).

• A tax charge of $198 million related to $264 million of regulatory assets for which DESC committed to forgo recovery.

Further, except for rate adjustments for fuel and environmental costs, DSM costs, and other rates routinely adjusted on an annual or biannual basis, DESC will freeze retail electric base rates at current levels until January 1, 2021.

The South Carolina Commission order also approved the removal of DESC's investment in certain transmission assets that have not been abandoned from BLRA capital costs. As of September 30, 2019, such investment in these assets included $345 million within utility plant, net and $32 million within regulatory assets, which amount represents certain deferred operating costs. The South Carolina Commission approved deferral of these operating costs related to the investment until recovery of the transmission capital costs and associated deferred operating costs is addressed in a future rate proceeding. DESC believes these transmission capital and deferred operating costs are probable of recovery; however, if the South Carolina Commission were to disallow recovery of or a reasonable return on all or a portion of them, an impairment charge equal to the disallowed costs may be required.

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Various parties filed petitions for rehearing or reconsideration of the SCANA Merger Approval Order. In January 2019, the South Carolina Commission issued an order (1) granting the request of various parties and finding that DESC was imprudent in its actions by not disclosing material information to the South Carolina Office of Regulatory Staff and the South Carolina Commission with regard to costs incurred subsequent to March 2015 and (2) denying the petitions for rehearing or consideration as to other issues raised in the various petitions. The deadline to appeal the SCANA Merger Approval Order and the order on rehearing expired in April 2019, and no party has sought appeal.

Claims and Litigation

The following describes certain legal proceedings involving DESC relating to events occurring before closing of the SCANA Combination. Dominion Energy intends to vigorously contest the lawsuits, claims and assessments which have been filed or initiated against DESC. No reference to, or disclosure of, any proceeding, item or matter described below shall be construed as an admission or indication that such proceeding, item or matter is material. For certain of these matters, and unless otherwise noted therein, DESC is unable to estimate a reasonable range of possible loss and the related financial statement impacts, but for any such matter there could be a material impact to its results of operations, financial condition and/or cash flows.  For the matters for which DESC is able to reasonably estimate a probable loss, the Consolidated Balance Sheets include reserves of $181 million included within reserves for litigation and regulatory proceedings and insurance receivables of $18 million included within other receivables at September 30, 2019.  During the nine months ended September 30, 2019, the Consolidated Statements of Comprehensive Income (Loss) includes charges of $266 million ($200 million after-tax), included within impairment of assets and other charges.

Ratepayer Class Actions

In May 2018, a consolidated complaint against DESC, SCANA and the State of South Carolina was filed in the State Court of Common Pleas in Hampton County, South Carolina (the DESC Ratepayer Case). In September 2018, the court certified this case as a class action. The plaintiffs allege, among other things, that DESC was negligent and unjustly enriched, breached alleged fiduciary and contractual duties and committed fraud and misrepresentation in failing to properly manage the NND Project, and that DESC committed unfair trade practices and violated state anti-trust laws. The plaintiffs sought a declaratory judgment that DESC may not charge its customers for any past or continuing costs of the NND Project, sought to have SCANA and DESC’s assets frozen and all monies recovered from Toshiba and other sources be placed in a constructive trust for the benefit of ratepayers and sought specific performance of the alleged implied contract to construct the NND Project.

In December 2018, the State Court of Common Pleas in Hampton County entered an order granting preliminary approval of a class action settlement and a stay of pre-trial proceedings in the DESC Ratepayer Case. The settlement agreement, contingent upon the closing of the SCANA Combination, provided that SCANA and DESC would establish an escrow account and proceeds from the escrow account would be distributed to the class members, after payment of certain taxes, attorneys' fees and other expenses and administrative costs. The escrow account would include (1) up to $2.0 billion, net of a credit of up to $2.0 billion in future electric bill relief, which would inure to the benefit of the escrow account in favor of class members over a period of time established by the South Carolina Commission in its order related to matters before the South Carolina Commission related to the NND Project, (2) a cash payment of $115 million and (3) the transfer of certain DESC-owned real estate or sales proceeds from the sale of such properties, which counsel for the DESC Ratepayer Class estimate to have an aggregate value between $60 million and $85 million. At the closing of the SCANA Combination, SCANA and DESC funded the cash payment portion of the escrow account. The court held a fairness hearing on the settlement in May 2019. In June 2019, the court entered an order granting final approval of the settlement, which order became effective July 2019. In July 2019, DESC transferred $117 million representing the cash payment, plus accrued interest, to the plaintiffs. In addition, property with a net recorded value of $42 million is in the process of being transferred to the plaintiffs in coordination with the court-appointed real estate trustee to satisfy the settlement agreement.

In September 2017, a purported class action was filed by Santee Cooper ratepayers against Santee Cooper, DESC, Palmetto Electric Cooperative, Inc. and Central Electric Power Cooperative, Inc. in the State Court of Common Pleas in Hampton County, South Carolina (the Santee Cooper Ratepayer Case). The allegations are substantially similar to those in the DESC Ratepayer Case. The plaintiffs seek a declaratory judgment that the defendants may not charge the purported class for reimbursement for past or future costs of the NND Project. In March 2018, the plaintiffs filed an amended complaint including as additional named defendants certain then current and former directors of Santee Cooper and SCANA. In June 2018, Santee Cooper filed a Notice of Petition for Original Jurisdiction with the Supreme Court of South Carolina which was denied. In December 2018, Santee Cooper filed its answer to the plaintiffs' fourth amended complaint and filed cross claims against DESC. In October 2019, Santee Cooper voluntarily consented to stay its cross claims against DESC pending the outcome of the trial of the underlying case. This case is pending.

In July 2019, a similar purported class action was filed by certain Santee Cooper ratepayers against DESC, SCANA, Dominion Energy and former directors and officers of SCANA in the State Court of Common Pleas in Orangeburg, South Carolina.  In August 2019, DESC, SCANA and Dominion Energy were voluntarily dismissed from the case. The claims are similar to the Santee Cooper Ratepayer Case. This case is pending.

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RICO Class Action

In January 2018, a purported class action was filed, and subsequently amended, against SCANA, DESC and certain former executive officers in the U.S. District Court for the District of South Carolina. The plaintiff alleges, among other things, that SCANA, DESC and the individual defendants participated in an unlawful racketeering enterprise in violation of RICO and conspired to violate RICO by fraudulently inflating utility bills to generate unlawful proceeds. The DESC Ratepayer Class Action settlement described previously contemplates dismissal of claims by DESC ratepayers in this case against DESC, SCANA and their officers. In August 2019, the individual defendants filed motions to dismiss. This case is pending.

SCANA Shareholder Litigation

In February 2018, a purported class action was filed against Dominion Energy and certain former directors of SCANA and DESC in the State Court of Common Pleas in Richland County, South Carolina (the Metzler Lawsuit). The plaintiff alleges, among other things, that defendants violated their fiduciary duties to shareholders by executing a merger agreement that would unfairly deprive plaintiffs of the true value of their SCANA stock, and that Dominion Energy aided and abetted these actions. Among other remedies, the plaintiff seeks to enjoin and/or rescind the merger. In February 2018, Dominion Energy removed the case to the U.S. District Court for the District of South Carolina and filed a Motion to Dismiss in March 2018. In August 2018, the case was remanded back to the State Court of Common Pleas in Richland County. Dominion Energy appealed the decision to remand to the U.S. Court of Appeals for the Fourth Circuit, where the appeal was consolidated with another lawsuit regarding the SCANA Merger Agreement to which DESC is not a party. In June 2019, the U.S. Court of Appeals for the Fourth Circuit reversed the order remanding the case to state court. The case is pending in the U.S. District Court for the District of South Carolina.

Employment Class Actions and Indemnification

In August 2017, a case was filed in the U.S. District Court for the District of South Carolina on behalf of persons who were formerly employed at the NND Project. In July 2018, the court certified this case as a class action. In February 2019, certain of these plaintiffs filed an additional case, which case has been dismissed and the plaintiffs have joined the case filed in August 2017. The plaintiffs allege, among other things, that SCANA, DESC, Fluor Corporation and Fluor Enterprises, Inc. violated the Worker Adjustment and Retraining Notification Act in connection with the decision to stop construction at the NND Project. The plaintiffs allege that the defendants failed to provide adequate advance written notice of their terminations of employment and are seeking damages, which could be as much as $100 million for 100% of the NND Project.

In September 2018, a case was filed in the State Court of Common Pleas in Fairfield County, South Carolina by Fluor Enterprises, Inc. and Fluor Daniel Maintenance Services, Inc. against DESC and Santee Cooper. The plaintiffs make claims for indemnification, breach of contract and promissory estoppel arising from, among other things, the defendants' alleged failure and refusal to defend and indemnify the Fluor defendants in the aforementioned case. These cases are pending.

FILOT Litigation and Related Matters

In November 2017, Fairfield County filed a complaint and a motion for temporary injunction against DESC in the State Court of Common Pleas in Fairfield County, South Carolina, making allegations of breach of contract, fraud, negligent misrepresentation, breach of fiduciary duty, breach of implied duty of good faith and fair dealing and unfair trade practices related to DESC’s termination of the FILOT agreement between DESC and Fairfield County related to the NND Project. The plaintiff sought a temporary and permanent injunction to prevent DESC from terminating the FILOT agreement. The plaintiff withdrew the motion for temporary injunction in December 2017. This case is pending.

Governmental Proceedings and Investigations

In June 2018, DESC received a notice of proposed assessment of approximately $410 million, excluding interest, from the SCDOR following its audit of DESC’s sales and use tax returns for the periods September 1, 2008 through December 31, 2017. The proposed assessment, which includes 100% of the NND Project, is based on the SCDOR’s position that DESC’s sales and use tax exemption for the NND Project does not apply because the facility will not become operational. DESC has protested the proposed assessment, which remains pending.

In September and October 2017, SCANA was served with subpoenas issued by the U.S. Attorney’s Office for the District of South Carolina and the Staff of the SEC’s Division of Enforcement seeking documents related to the NND Project. In addition, the South Carolina Law Enforcement Division is conducting a criminal investigation into the handling of the NND Project by SCANA and DESC. These matters are pending. SCANA and DESC are cooperating fully with the investigations, including responding to additional subpoenas and document requests.

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Other Litigation

In December 2018, arbitration proceedings commenced between DESC and Cameco Corporation related to a supply agreement signed in May 2008. This agreement provides the terms and conditions under which DESC agreed to purchase uranium hexafluoride from Cameco Corporation over a period from 2010 to 2020. Cameco Corporation alleges that DESC violated this agreement by failing to purchase the stated quantities of uranium hexafluoride for the 2017 and 2018 delivery years. DESC denies that it is in breach of the agreement and believes that it has reduced its purchase quantity within the terms of the agreement. This matter is pending.

In September 2019, a South Carolina state court jury awarded a judgment to the estate of Jose Larios in a wrongful death suit filed in June 2017 against DESC, of which DESC was apportioned $19 million.  DESC holds general liability insurance coverage which is expected to provide payment for substantially all DESC’s liability in this matter. In October 2019, DESC filed a motion requesting a reduction in the judgment or, in the alternative, a new trial. In November 2019, DESC’s motion for a new trial was granted, setting aside the entire verdict amount. This matter is pending.  

Contractor Bankruptcy Proceedings

Westinghouse’s Reorganization Plan became effective August 1, 2018. Initially, Westinghouse had projected that its Reorganization Plan would pay in full or nearly in full its pre-petition trade creditors, including several of the Westinghouse Subcontractors which have alleged non-payment by the Consortium for amounts owed for work performed on the NND Project and have filed liens on related property in Fairfield County, South Carolina. DESC is contesting approximately $285 million of such filed liens. Most of these asserted liens are “pre-petition” claims that relate to work performed by Westinghouse Subcontractors before the Westinghouse bankruptcy, although some of them are “post-petition” claims arising from work performed after the Westinghouse bankruptcy. It is possible that the Reorganization Plan will not provide for payment in full or nearly in full to its pre-petition trade creditors. The shortfall could be significant. In addition, payments under the Toshiba Settlement are subject to reduction if Westinghouse pays Westinghouse Subcontractors holding pre-petition liens directly. Under these circumstances, DESC and Santee Cooper, each in its pro rata share, would be required to make Citibank, N.A., which purchased the scheduled payments under the Toshiba Settlement, whole for reductions related to valid subcontractor and vendor pre-petition liens up to $60 million ($33 million for DESC's 55% share).

DESC and Santee Cooper are responsible for amounts owed to Westinghouse for valid work performed by Westinghouse Subcontractors on the NND Project after the Westinghouse bankruptcy filing (i.e., post-petition) until termination of the IAA (the IAA Period). In the Westinghouse bankruptcy proceeding, deadlines were established for creditors of Westinghouse to assert the amounts owed to such creditors prior to the Westinghouse bankruptcy filing and during the IAA Period. Many of the Westinghouse Subcontractors have filed such claims. DESC does not believe that the claims asserted related to the IAA Period will exceed the amounts previously funded for the currently asserted IAA-related claims, whether relating to claims already paid or those remaining to be paid. DESC intends to oppose any previously unasserted claim that is asserted against it, whether directly or indirectly by a claim through the IAA.

Further, some Westinghouse Subcontractors who have made claims against Westinghouse in the bankruptcy proceeding also filed against DESC and Santee Cooper in South Carolina state court for damages. The Westinghouse Subcontractor claims in South Carolina state court include common law claims for pre-petition work, IAA Period work, and work after the termination of the IAA. Many of these claimants have also asserted construction liens against the NND Project site. While DESC cannot be assured that it will not have any exposure on account of unpaid Westinghouse Subcontractor claims, which claims DESC is presently disputing, DESC believes it is unlikely that it will be required to make payments on account of such claims.

Nuclear Insurance

Under Price-Anderson, DESC (for itself and on behalf of Santee-Cooper) maintains agreements of indemnity with the U.S. Nuclear Regulatory Commission that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at Summer. Price-Anderson provides funds up to $14.0 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $450 million by American Nuclear Insurers with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. Each reactor licensee is liable for up to $138 million per reactor owned for each nuclear incident occurring at any reactor in the U.S., provided that not more than $21 million of the liability per reactor would be assessed per year. DESC’s maximum assessment, based on its two-thirds ownership of Summer, would be $92 million per incident, but not more than $14 million per year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years.

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DESC currently maintains insurance policies (for itself and on behalf of Santee Cooper) with NEIL. The policies provide coverage to Summer for property damage and outage costs up to $2.75 billion resulting from an event of nuclear origin and up to $2.33 billion resulting from an event of a non-nuclear origin. The NEIL policies in aggregate, are subject to a maximum loss of $2.75 billion for any single loss occurrence. The NEIL policies permit retrospective assessments under certain conditions to cover insurer’s losses. Based on the current annual premium, DESC’s portion of the retrospective premium assessment would not exceed $24 million. DESC currently maintains an excess property insurance policy (for itself and on behalf of Santee Cooper) with EMANI. The policy provides coverage to Summer for property damage and outage costs up to $415 million resulting from an event of a non-nuclear origin. The EMANI policy permits retrospective assessments under certain conditions to cover insurer's losses. Based on the current annual premium, DESC's portion of the retrospective premium assessment would not exceed $2 million.

To the extent that insurable claims for property damage, decontamination, repair and replacement and other costs and expenses arising from an incident at Summer exceed the policy limits of insurance, or to the extent such insurance becomes unavailable in the future, and to the extent that DESC's rates would not recover the cost of any purchased replacement power, DESC will retain the risk of loss as a self-insurer. DESC has no reason to anticipate a serious nuclear or other incident. However, if such an incident were to occur, it likely would have a material impact on DESC's results of operations, cash flows and financial position.  

12. LEASES

At September 30, 2019, DESC had the following lease assets and liabilities recorded in the Consolidated Balance Sheets:

(millions)	September 30, 2019
Lease assets:
Operating lease assets(1)	$	24
Finance lease assets(2)		27
Total lease assets	$	51
Lease liabilities:
Operating lease - current(3)	$	3
Operating lease - noncurrent(4)		19
Finance lease - current(5)		7
Finance lease - noncurrent(6)		21
Total lease liabilities	$	50

(1) Included in other deferred debits and other assets in the Consolidated Balance Sheets.

(2) Included in utility plant, net, in the Consolidated Balance Sheets, net of $22 million of accumulated amortization at September 30, 2019.

(3) Included in other current liabilities in the Consolidated Balance Sheets.

(4) Included in other deferred credits and other liabilities in the Consolidated Balance Sheets.

(5) Included in current portion of long-term debt in the Consolidated Balance Sheets.

(6) Included in long-term debt in the Consolidated Balance Sheets.

For the three and nine months ended September 30, 2019, total lease cost consisted of the following:

	Three Months Ended		Nine Months Ended
(millions)	September 30, 2019		September 30, 2019
Finance lease cost:
Amortization	$	2	$	6
Interest		—		—
Operating lease cost		1		2
Short-term lease cost		—		1
Variable lease cost		—		—
Total lease cost	$	3	$	9

For the nine months ended September 30, 2019, cash paid for amounts included in the measurement of lease liabilities consisted of the following amounts, included in the Consolidated Statements of Cash Flows:

	Nine Months Ended
(millions)	September 30, 2019
Operating cash flows from finance leases	$	1
Operating cash flows from operating leases		3
Financing cash flows from finance leases		5

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At September 30, 2019, the weighted average remaining lease term and weighted average discount rate for finance and operating leases were as follows:

	September 30, 2019
Weighted average remaining lease term - finance leases	5 years
Weighted average remaining lease term - operating leases	18 years
Weighted average discount rate - finance leases		2.96	%
Weighted average discount rate - operating leases		3.95	%

Lease liabilities have the following scheduled maturities:

(millions)	Operating			Finance
2019	$	1		$	2
2020		4			8
2021		3			6
2022		2			5
2023		1			3
After 2023		23			6
Total undiscounted lease payments		34			30
Present value adjustment		(12	)		(2	)
Present value of lease liabilities	$	22		$	28

13. OPERATING SEGMENTS

Operating segments include Electric Operations and Gas Distribution and are organized primarily on the basis of products and services sold.

In connection with the SCANA Combination, effective January 2019, reportable segments were changed to include a Corporate and Other segment and to utilize comprehensive income (loss) as the measure of segment profitability. The Corporate and Other segment includes specific items attributable to DESC's operating segments that are not included in profit measures evaluated by executive management in assessing the segments' performance or in allocating resources. Corresponding amounts in prior periods have been recast to conform to the current presentation.

In the nine months ended September 30, 2019, DESC reported after-tax net expenses of $1.4 billion for specific items in the Corporate and Other segment, with $1.4 billion attributable to its operating segments.

The net expense for specific items attributable to DESC’s operating segments in 2019 primarily related to the impact of the following items:

• A $1.0 billion ($756 million after-tax) charge for refunds of amounts previously collected from retail electric customers for the NND Project, attributable to Electric Operations;

• $266 million ($200 million after-tax) of charges associated with litigation, attributable to Electric Operations;

• A $198 million tax charge for $264 million of income tax-related regulatory assets for which DESC committed to forgo recovery, attributable to Electric Operations;

• A $114 million ($86 million after-tax) charge for utility plant primarily for which DESC committed to forgo recovery, attributable to Electric Operations;

• $90 million ($68 million after-tax) of merger and integration-related costs associated with the SCANA Combination, including a $75 million ($56 million after-tax) charge related to a voluntary retirement program, attributable to:

• Electric Operations ($61 million after-tax); and

• Gas Distribution ($7 million after-tax); and

• $59 million tax charges for changes in unrecognized tax benefits, attributable to Electric Operations.

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(millions)	External Revenue			Comprehensive Income (Loss) Available (Attributable) to Common Shareholder
Three Months Ended September 30, 2019
Electric Operations	$	728		$	169
Gas Distribution		67			(1	)
Corporate and Other		—			(25	)
Adjustments/Eliminations		—			—
Consolidated Total	$	795		$	143
Three Months Ended September 30, 2018
Electric Operations	$	670		$	112
Gas Distribution		69			(7	)
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(6	)
Consolidated Total	$	739		$	98
Nine Months Ended September 30, 2019
Electric Operations	$	1,875		$	321
Gas Distribution		292			13
Corporate and Other		(1,009	)		(1,364	)
Adjustments/Eliminations		—			(14	)
Consolidated Total	$	1,158		$	(1,044	)
Nine Months Ended September 30, 2018
Electric Operations	$	1,770		$	242
Gas Distribution		304			22
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(15	)
Consolidated Total	$	2,074		$	248

14. AFFILIATED AND RELATED PARTY TRANSACTIONS

DESC owns 40% of Canadys Refined Coal, LLC, which is involved in the manufacturing and sale of refined coal to reduce emissions at certain of DESC's generating facilities. DESC accounts for this investment using the equity method. Purchases and sales of the related coal are recorded as other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss).

DESC purchases natural gas and related pipeline capacity from SCANA Energy Marketing, Inc. to serve its retail gas customers and to satisfy certain electric generation requirements. These purchases are included within gas purchased for resale or fuel used in electric generation, as applicable in the Consolidated Statements of Comprehensive Income (Loss).

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DESS, on behalf of itself and its parent company, provides the following services to DESC, which are rendered at direct or allocated cost: information systems, telecommunications, customer support, marketing and sales, human resources, corporate compliance, purchasing, financial, risk management, public affairs, legal, investor relations, gas supply and capacity management, strategic planning, general administrative, and retirement benefits. In addition, DESS processes and pays invoices for DESC and is reimbursed. Costs for these services include amounts capitalized. Amounts expensed are primarily recorded in other operations and maintenance - affiliated suppliers and other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss).

	Three Months Ended September 30,				Nine Months Ended September 30,
(millions)	2019		2018		2019		2018
Purchases of coal from affiliate	$	38	$	45	$	100	$	123
Sales of coal to affiliate		37		45		99		122
Purchases of fuel used in electric generation from affiliate		—		35		43		95
Direct and allocated costs from services company affiliate(1)		67		73		207		208
Operating Revenues - Electric from sales to affiliate		1		1		3		3
Operating Expenses - Other taxes from affiliate		2		2		5		4

(1) Includes capitalized expenditures of $13 million and $10 million for the three months ended September 30, 2019 and 2018, and $33 million and $29 million for the nine months ended September 30, 2019 and 2018, respectively.

(millions)	September 30, 2019		December 31, 2018
Receivable from Canadys Refined Coal, LLC	$	13	$	7
Payable to Canadys Refined Coal, LLC		13		7
Payable to SCANA Energy Marketing, Inc.		—		14
Payable to DESS		47		38

In connection with the SCANA Combination, purchases from certain entities owned by Dominion Energy became affiliated transactions. During the three and nine months ended September 30, 2019, DESC purchased electricity generated by three such affiliates, totaling $3 million and $7 million, respectively, which is recorded as purchased power in the Consolidated Statements of Comprehensive Income (Loss). At September 30, 2019, DESC had accounts payable balances to these affiliates totaling less than $1 million. In addition, during the three and nine months ended September 30, 2019, DESC incurred demand and transportation charges from Dominion Energy Carolina Gas Transmission, LLC totaling $16 million and $48 million, respectively, of which $6 million and $15 million, respectively, is recorded as fuel used in electric generation and $10 million and $33 million, respectively, is recorded as gas purchased for resale in the Consolidated Statements of Comprehensive Income (Loss). At September 30, 2019, DESC had an accounts payable balance due to this affiliate totaling $6 million.

Borrowings from an affiliate are described in Note 5.

15. OTHER INCOME (EXPENSE), NET

Components of other income (expense), net are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
(millions)	2019			2018			2019			2018
Revenues from contracts with customers	$	1		$	1		$	4		$	4
Other income		11			5			17			135
Other expense		(23	)		(10	)		(48	)		(22	)
Allowance for equity funds used during construction		(2	)		3			—			7
Other income (expense), net	$	(13	)	$	(1	)	$	(27	)	$	124

Other income in 2018 includes gains from the settlement of interest rate derivatives of $115 million (see Note 7). Non-service cost components of pension and other postretirement benefits are included in other expense.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

MD&A provides management’s narrative analysis of its consolidated results of operation. MD&A should be read in conjunction with DESC's Consolidated Financial Statements. DESC meets the conditions to file under the reduced disclosure format, and therefore has omitted certain sections of MD&A.

Forward-Looking Statements

This report contains statements concerning DESC’s expectations, plans, objectives, future financial performance and other statements that are not historical facts. These statements are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. In most cases, the reader can identify these forward-looking statements by such words as “anticipate,” “estimate,” “forecast,” “expect,” “believe,” “should,” “could,” “plan,” “may,” “continue,” “target” or other similar words.

DESC makes forward-looking statements with full knowledge that risks and uncertainties exist that may cause actual results to differ materially from predicted results. Factors that may cause actual results to differ are often presented with the forward-looking statements themselves. Additionally, other factors may cause actual results to differ materially from those indicated in any forward-looking statement. These factors include but are not limited to:

• the ability of DESC to recover through rates certain costs expended on the NND Project, and a reasonable return on those costs, under the SCANA Merger Approval Order and the abandonment provisions of the BLRA or through other means;

• uncertainties relating to the bankruptcy filing by Westinghouse and WECTEC;

• further changes in tax laws and realization of tax benefits and credits, and the ability to realize or maintain tax credits and deductions, particularly in light of the abandonment of the NND Project;

• legislative and regulatory actions, particularly changes related to electric and gas services, rate regulation, regulations governing electric grid reliability and pipeline integrity, environmental regulations including any imposition of fees or taxes on carbon emitting generating facilities, and any actions involving or arising from the abandonment of the NND Project;

• current and future litigation, including particularly litigation or government investigations or any actions involving or arising from the construction or abandonment of the NND Project, including the possible impacts on liquidity and other financial impacts therefrom;

• the results of short- and long-term financing efforts, including prospects for obtaining access to capital markets and other sources of liquidity and the effect of rating agency actions on the cost of and access to capital and sources of liquidity of DESC and Dominion Energy;

• the ability of suppliers, both domestic and international, to timely provide the labor, secure processes, components, parts, tools, equipment and other supplies needed which may be highly specialized or in short supply, at agreed upon quality and prices, for our construction program, operations and maintenance;

• the results of efforts to ensure the physical and cyber security of key assets and processes;

• changes in the economy, especially in areas served by DESC;

• the impact of competition from other energy suppliers, including competition from alternate fuels in industrial markets;

• the impact of conservation and demand side management efforts and/or technological advances on customer usage;

• the loss of electricity sales to distributed generation, such as solar photovoltaic systems or energy storage systems;

• growth opportunities;

• the effects of weather, especially in areas where the generation and transmission facilities of DESC are located and in areas served by DESC;

• changes in accounting rules and accounting policies;

• payment and performance by counterparties and customers as contracted and when due;

• the results of efforts to license, site, construct and finance facilities, and to receive related rate recovery, for generation and transmission;

• the results of efforts to operate DESC's electric and gas systems and assets in accordance with acceptable performance standards, including the impact of additional distributed generation;

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• the availability of fuels such as coal, natural gas and enriched uranium used to produce electricity; the availability of purchased power and natural gas for distribution; the level and volatility of future market prices for such fuels and purchased power; and the ability to recover the costs for such fuels and purchased power;

• the availability and retention of skilled, licensed and experienced human resources to properly manage, operate, and grow DESC's businesses, particularly in light of uncertainties with respect to integration within the combined companies of Dominion Energy;

• labor disputes;

• performance of DESC’s pension plan assets and the effect(s) of associated discount rates;

• inflation or deflation;

• changes in interest rates;

• compliance with regulations; and

• natural disasters, man-made mishaps and acts of terrorism that directly affect our operations or the regulations governing them.

Additionally, other risks that could cause actual results to differ from predicted results are set forth in Part II, Item 1A. Risk Factors in this report.

DESC’s forward-looking statements are based on beliefs and assumptions using information available at the time the statements are made. DESC cautions the reader not to place undue reliance on its forward-looking statements because the assumptions, beliefs, expectations and projections about future events may, and often do, differ materially from actual results. DESC undertakes no obligation to update any forward-looking statement to reflect developments occurring after the statement is made.

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RESULTS OF OPERATIONS

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2019

AS COMPARED TO THE CORRESPONDING PERIODS IN 2018

Results of Operations

	Third Quarter						Year-To-Date
(millions)	2019		2018		$ Change		2019			2018		$ Change
Net income (loss)	$	142	$	103	$	39	$	(1,031	)	$	262	$	(1,293	)

Third Quarter 2019 vs. 2018

Net income increased 38%, primarily due to increased earnings recognized under the SCANA Merger Approval Order issued by the South Carolina Commission in 2019 compared to earnings recognized under South Carolina legislation enacted in the second quarter of 2018.

Year-To-Date 2019 vs. 2018

Net income decreased $1.3 billion, primarily due to charges for refunds of amounts previously collected from retail electric customers for the NND Project, certain regulatory assets and utility plant for which DESC committed to forgo recovery, litigation and a voluntary retirement program. These decreases were partially offset by increased earnings recognized under the SCANA Merger Approval Order issued by the South Carolina Commission in 2019 compared to earnings recognized under South Carolina legislation enacted in the second quarter of 2018.

Analysis of Consolidated Operations

	Third Quarter									Year-To-Date
(millions)	2019			2018			$ Change			2019			2018		$ Change
Operating revenues	$	795		$	739		$	56		$	1,158		$	2,074	$	(916	)
Fuel used in electric generation		167			188			(21	)		447			503		(56	)
Purchased power		15			10			5			35			77		(42	)
Gas purchased for resale		37			41			(4	)		158			161		(3	)
Net revenue		576			500			76			518			1,333		(815	)
Other operations and maintenance		144			144			—			483			455		28
Impairment of assets and other charges		—			—			—			371			4		367
Depreciation and amortization		116			81			35			333			242		91
Other taxes		55			63			(8	)		196			192		4
Other income (expense), net		(13	)		(1	)		(12	)		(27	)		124		(151	)
Interest charges		66			79			(13	)		202			232		(30	)
Income tax expense (benefit)		40			29			11			(63	)		70		(133	)

Third Quarter 2019 vs. 2018

Net revenue increased 15%, primarily due to increased revenue recognized under the SCANA Merger Approval Order issued by the South Carolina Commission in 2019 compared to revenue recognized under South Carolina legislation enacted in the second quarter of 2018 to temporarily reduce the amount collected from customers under the BLRA.

Depreciation and amortization increased 43%, primarily reflecting the amortization of NND Project costs.

Other taxes decreased 13%, primarily due to adjustments to estimated annual property tax accruals.

Other income (expense), net decreased $12 million, primarily due to a charge related to a voluntary retirement program ($11 million) and accrued penalties related to unrecognized tax benefits in the current year ($7 million), partially offset by a gain on sale of certain warranty service contracts ($7 million).

Interest charges decreased 16%, primarily due to lower long-term debt principal balances primarily as a result of the debt tender offers completed in 2019 ($18 million) and the reversal of accrued interest related to a refund reserve ($7 million). These decreases were partially offset by interest charges on unrecognized tax benefits in the current year ($13 million).

Income tax expense increased 38%, primarily due to higher pre-tax income.

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Year-To-Date 2019 vs. 2018

Net revenue decreased 61%, primarily due to:

• A $1.0 billion charge to electric revenue for refunds of amounts previously collected from retail electric customers for the NND Project;

• A $12 million decrease in gas revenues due to lower South Carolina Commission approved rates and refunds of amounts previously collected from gas customers; partially offset by

• A $114 million increase in electric revenue pursuant to a South Carolina Commission order whereby fuel cost recovery was substantially offset with gains realized upon the settlement of certain interest rate derivative contracts in 2018, as further described in other income (expense) below; and

• Increased revenue recognized under the SCANA Merger Approval Order issued by the South Carolina Commission in 2019 compared to revenue recognized under South Carolina legislation enacted in the second quarter of 2018 to temporarily reduce the amount collected from customers under the BLRA ($97 million).

Other operations and maintenance increased 6%, primarily due to a charge related to a voluntary retirement program ($51 million), partially offset by lower non-labor electric generation expenses ($11 million) and lower legal and merger-related costs ($11 million).

Impairment of assets and other charges increased $367 million, primarily due to $266 million of charges related to litigation and a $105 million charge for utility plant for which DESC committed to forgo recovery.

Depreciation and amortization increased 38%, primarily reflecting the amortization of NND Project costs.

Other income (expense), net decreased $151 million, primarily due to the absence of gains realized upon the settlement of interest rate derivative contracts in 2018 ($115 million) that were mostly offset by downward adjustments to electric revenues pursuant to a previously received South Carolina Commission order related to fuel cost recovery, a charge related to a voluntary retirement program ($20 million), lower equity allowance for funds used during construction ($7 million) and accrued penalties related to unrecognized tax benefits in the current year ($7 million), partially offset by a gain on sale of certain warranty service contracts ($7 million).

Interest charges decreased 13%, primarily due to lower long-term debt principal balances primarily as a result of the debt tender offers completed in 2019 ($42 million), partially offset by interest charges on unrecognized tax benefits in the current year ($9 million).

Income tax expense decreased $133 million, primarily due to lower pre-tax income ($393 million), partially offset by a tax charge related to regulatory assets for which DESC committed to forgo recovery ($198 million) and change in unrecognized tax benefits ($62 million).

ITEM 4. CONTROLS AND PROCEDURES

As of September 30, 2019, management has evaluated, with the participation of the CEO and CFO, (a) the effectiveness of the design and operation of disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) and (b) any change in internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act).  Based on this evaluation, the CEO and CFO concluded that, as of September 30, 2019, these disclosure controls and procedures were effective. There has been no change in internal control over financial reporting during the quarter ended September 30, 2019 that has materially affected or is reasonably likely to materially affect internal control over financial reporting.

35

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time, DESC is alleged to be in violation or in default under orders, statutes, rules or regulations relating to the environment, compliance plans imposed upon or agreed to by DESC, or permits issued by various local, state and/or federal agencies for the construction or operation of facilities. Administrative proceedings may also be pending on these matters. In addition, DESC is involved in various legal proceedings from time to time, whether in the ordinary course of business or particularly following the abandonment of the NND Project.

See the following for discussions on various legal, environmental and other regulatory proceedings to which DESC is a party, which information is incorporated herein by reference:

• Notes 2 and 11 to the Consolidated Financial Statements in DESC’s Annual Report on Form 10-K for the year ended December 31, 2018.

• Note 10 to the Consolidated Financial Statements in DESC’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2019.

• Note 11 to the Consolidated Financial Statements in DESC’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2019.

• Note 11 to the Consolidated Financial Statements in this report.

ITEM 1A. RISK FACTORS

DESC’s business is influenced by many factors that are difficult to predict, involve uncertainties that may materially affect actual results and are often beyond its control. A number of these risk factors have been identified in DESC’s Annual Report on Form 10-K for the year ended December 31, 2018, which should be taken into consideration when reviewing the information contained in this report. DESC filed such annual report on a combined basis with SCANA. Accordingly, the information presented in such risk factors is presented on a combined basis and therefore some of the information may apply only to SCANA and not DESC. DESC makes no representation as to any such information. There have been no material changes with regard to the risk factors previously disclosed in DESC's Annual Report on Form 10-K for the year ended December 31, 2018. For other factors that may cause actual results to differ materially from those indicated in any forward-looking statement or projection contained in this report, see Forward-Looking Statements in Part I, Item 2. MD&A.

36

ITEM 6. EXHIBITS

Exhibits filed or furnished with this Quarterly Report on Form 10-Q are listed in the following Exhibit Index.

As permitted under Item 601(b) (4) (iii) of Regulation S-K, instruments defining the rights of holders of long-term debt of less than 10% of the total consolidated assets of DESC, for itself and its consolidated affiliates, have been omitted and DESC agrees to furnish a copy of such instruments to the SEC upon request.

EXHIBIT INDEX

Exhibit No.	Description
3.1	Amended and Restated Articles of Incorporation, effective April 29, 2019 (Exhibit 3.1, Form 8-K filed April 29, 2019, File No. 1-3375).
3.2	Amended and Restated Bylaws, effective April 29, 2019 (Exhibit 3.2, Form 8-K filed April 29, 2019, File No. 1-3375).
31.1	Certification by Chief Executive Officer of Dominion Energy South Carolina, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).
31.2	Certification by Chief Financial Officer of Dominion Energy South Carolina, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).
32.1	Certification to the Securities and Exchange Commission by Chief Executive Officer and Chief Financial Officer of Dominion Energy South Carolina, Inc. as required by Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
101	The following financial statements from Dominion Energy South Carolina, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2019, filed on November 4, 2019, formatted in iXBRL (Inline eXtensible Reporting Language): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Comprehensive Income (Loss), (iii) Consolidated Statements of Cash Flows, (iv) Consolidated Statements of Changes in Common Equity, and (v) the Notes to Consolidated Financial Statements.
104	Cover Page Interactive Data File (formatted in iXBRL (Inline eXtensible Reporting Language) and contained in Exhibit 101).

37

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	DOMINION ENERGY SOUTH CAROLINA, INC.
		(Registrant)
	By:	/s/ Michele L. Cardiff
Date: November 4, 2019		Michele L. Cardiff
		Vice President, Controller and Chief Accounting Officer

38

EX-31.1

Exhibit 31.1

I, P. Rodney Blevins, certify that:

1. I have reviewed this report on Form 10-Q of Dominion Energy South Carolina, Inc.;

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 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 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.

Date: November 4, 2019	/s/ P. Rodney Blevins
	P. Rodney Blevins President & Chief Executive Officer – Southeast Energy Group

EX-31.2

Exhibit 31.2

I, James R. Chapman, certify that:

1. I have reviewed this report on Form 10-Q of Dominion Energy South Carolina, Inc.;

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 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 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.

Date: November 4, 2019	/s/ James R. Chapman
	James R. Chapman Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Dominion Energy South Carolina, Inc. (the “Company”), certify that:

1. the Quarterly Report on Form 10-Q for the quarter ended September 30, 2019 (the “Report”), of the Company to which this certification is an exhibit fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)).

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of September 30, 2019, and for the period then ended.

/s/ P. Rodney Blevins

P. Rodney Blevins
President & Chief Executive Officer –

Southeast Energy Group
November 4, 2019

/s/ James R. Chapman

James R. Chapman
Executive Vice President and
Chief Financial Officer
November 4, 2019

XML

Leases (Cash Paid for Amounts Included in Measurement of Lease Liabilities) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from finance leases	$ 1
Operating cash flows from operating leases	3
Financing cash flows from finance leases	$ 5

XML

Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
External revenue	$ 795	$ 739	$ 1,158	$ 2,074
Comprehensive income (loss) available (attributable) to common shareholder	143	98	(1,044)	248
Adjustments/Eliminations
Segment Reporting Information [Line Items]
External revenue	0	0	0	0
Comprehensive income (loss) available (attributable) to common shareholder	0	(6)	(14)	(15)
Electric Operations | Operating Segments
Segment Reporting Information [Line Items]
External revenue	728	670	1,875	1,770
Comprehensive income (loss) available (attributable) to common shareholder	169	112	321	242
Gas Distribution | Operating Segments
Segment Reporting Information [Line Items]
External revenue	67	69	292	304
Comprehensive income (loss) available (attributable) to common shareholder	(1)	(7)	13	22
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
External revenue	0	0	(1,009)	0
Comprehensive income (loss) available (attributable) to common shareholder	$ (25)	$ (1)	$ (1,364)	$ (1)

XML

Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Balance Sheet) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
SCANA Energy Marketing, Inc. [Member]
Related Party Transaction [Line Items]
Payable to affiliates	$ 0	$ 14
DESS [Member]
Related Party Transaction [Line Items]
Payable to affiliates	47	38
Canadys Refined Coal [Member]
Related Party Transaction [Line Items]
Receivable from affiliates	13	7
Payable to affiliates	$ 13	$ 7

XML

Derivative Financial Instruments (Offsetting Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross liabilities presented in the consolidated balance sheet	$ 23	$ 11
Gross amounts not offset in the consolidated balance sheet, financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, cash collateral paid	23	11
Gross amounts not offset in the consolidated balance sheet, net amounts	0	0
Interest Rate Contract [Member] | Over The Counter [Member]
Derivative [Line Items]
Gross liabilities presented in the consolidated balance sheet	23	11
Gross amounts not offset in the consolidated balance sheet, financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, cash collateral paid	23	11
Gross amounts not offset in the consolidated balance sheet, net amounts	$ 0	$ 0

XML

Long-Term and Short-Term Debt and Liquidity (Narrative) (Detail) - USD ($)		1 Months Ended			3 Months Ended		9 Months Ended
		Aug. 31, 2019	May 31, 2019	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019	Feb. 28, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Aggregate purchase price of first mortgage bonds		$ 552,000,000								$ 1,200,000,000
Loss on reacquired debt		$ 83,000,000					$ 187,000,000
Redemption of remaining principal outstanding plus accrued interest							1,890,000,000	$ 824,000,000
Equity capital contribution returned to parent							$ 20,000,000	0
Line of credit facility maturity date							2023-03
Weighted average interest rate, outstanding commercial paper											3.82%
Commercial paper borrowing limit				$ 2,200,000,000
Commercial paper maturity period				2020-04
Interest charges	[1]				$ 66,000,000	$ 79,000,000	$ 202,000,000	232,000,000
Interest income from money pool transactions					1,000,000	1,000,000	7,000,000	2,000,000
Interest expense from money pool transactions					1,000,000	$ 1,000,000	7,000,000	$ 2,000,000
Money pool borrowings due to affiliates					222,000,000		222,000,000				$ 282,000,000
Investments due from affiliates					17,000,000		17,000,000				$ 353,000,000
Maximum [Member]
Debt Instrument [Line Items]
Short term commercial paper maturity period				1 year
Dominion Energy
Debt Instrument [Line Items]
Short-term borrowings outstanding, maximum				$ 900,000,000
Short-term borrowings outstanding					501,000,000		501,000,000
Interest charges					1,000,000		1,000,000
Current Joint Revolving Credit Facility
Debt Instrument [Line Items]
Facility limit					1,000,000,000		1,000,000,000
Current Joint Revolving Credit Facility | Dominion Energy
Debt Instrument [Line Items]
Facility limit									$ 6,000,000,000
Line of Credit Facility
Debt Instrument [Line Items]
Facility limit					500,000,000		500,000,000
Letter of Credit
Debt Instrument [Line Items]
Debt instrument, face amount					68,000,000		68,000,000
Facility limit					$ 1,000,000,000.0		$ 1,000,000,000.0
Genco
Debt Instrument [Line Items]
Commercial paper borrowing limit				$ 200,000,000
Genco | Maximum [Member]
Debt Instrument [Line Items]
Short term commercial paper maturity period				1 year
3.05% Promissory Note due in May 2024 | Genco
Debt Instrument [Line Items]
Debt instrument, face amount			$ 230,000,000
Debt instrument, interest rate			3.05%
Debt instrument, maturity date			2024-05
5.49% Senior Secured Note Due 2024 | Genco
Debt Instrument [Line Items]
Debt instrument, interest rate			5.49%
Debt instrument, maturity year			2024
Redemption of remaining principal outstanding plus accrued interest			$ 33,000,000
Equity capital contribution returned to parent			$ 20,000,000

[1] See Note 14 for amounts attributable to affiliates.

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Other Income (Expense), Net

9 Months Ended

Sep. 30, 2019

Income Statement [Abstract]

Other Income (Expense), Net

15. OTHER INCOME (EXPENSE), NET

Components of other income (expense), net are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
(millions)	2019			2018			2019			2018
Revenues from contracts with customers	$	1		$	1		$	4		$	4
Other income		11			5			17			135
Other expense		(23	)		(10	)		(48	)		(22	)
Allowance for equity funds used during construction		(2	)		3			—			7
Other income (expense), net	$	(13	)	$	(1	)	$	(27	)	$	124

Other income in 2018 includes gains from the settlement of interest rate derivatives of $115 million (see Note 7). Non-service cost components of pension and other postretirement benefits are included in other expense.

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Long-Term and Short-Term Debt and Liquidity (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Line of Credit Facilities

DESC's share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, were as follows:

(millions)	Facility Limit		Outstanding Commercial Paper		Outstanding Letters of Credit
At September 30, 2019	$	1,000	$	—	$	—

(millions)	Facility Limit(1)		Outstanding Commercial Paper		Outstanding Letters of Credit
At December 31, 2018	$	1,200	$	73	$	—

(1) Included $500 million related to Fuel Company. In February 2019, Fuel Company's commercial paper program and its credit facility were terminated.

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Consolidated Statements of Changes in Common Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	AOCI	Noncontrolling Interest
Beginning balance at Dec. 31, 2017	$ 4,980	$ 2,860	$ 1,982	$ (4)	$ 142
Beginning balance (in shares) at Dec. 31, 2017		40
Total comprehensive income (loss) available (attributable) to common shareholder	263		247	1	15
Capital contribution from parent	20				20
Dividend to parent	(91)		(83)		(8)
Ending balance at Sep. 30, 2018	5,172	$ 2,860	2,146	(3)	169
Ending balance (in shares) at Sep. 30, 2018		40
Beginning balance at Jun. 30, 2018	5,085	$ 2,860	2,060	(4)	169
Beginning balance (in shares) at Jun. 30, 2018		40
Total comprehensive income (loss) available (attributable) to common shareholder	104		97	1	6
Dividend to parent	(17)		(11)		(6)
Ending balance at Sep. 30, 2018	5,172	$ 2,860	2,146	(3)	169
Ending balance (in shares) at Sep. 30, 2018		40
Beginning balance at Dec. 31, 2018	4,315	$ 2,860	1,279	(3)	179
Beginning balance (in shares) at Dec. 31, 2018		40
Cumulative-effect of change in accounting principle	0		1	(1)
Total comprehensive income (loss) available (attributable) to common shareholder	(1,030)		(1,045)	1	14
Capital contribution from parent	825	$ 825
Capital contribution returned to parent	(20)				(20)
Dividend to parent	(20)		(20)
Other	(1)		(1)
Ending balance at Sep. 30, 2019	4,069	$ 3,685	214	(3)	173
Ending balance (in shares) at Sep. 30, 2019		40
Beginning balance at Jun. 30, 2019	3,876	$ 3,635	72	(4)	173
Beginning balance (in shares) at Jun. 30, 2019		40
Total comprehensive income (loss) available (attributable) to common shareholder	143		142	1
Capital contribution from parent	50	$ 50
Ending balance at Sep. 30, 2019	$ 4,069	$ 3,685	$ 214	$ (3)	$ 173
Ending balance (in shares) at Sep. 30, 2019		40

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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Revenues:
Electric	[1]	$ 728	$ 670	$ 869	$ 1,770
Gas		67	69	289	304
Total operating revenues		795	739	1,158	2,074
Operating Expenses
Fuel used in electric generation	[1]	167	188	447	503
Purchased power	[1]	15	10	35	77
Gas purchased for resale	[1]	37	41	158	161
Other operations and maintenance		90	105	309	320
Other operations and maintenance - affiliated suppliers		54	39	174	135
Impairment of assets and other charges		0	0	371	4
Depreciation and amortization		116	81	333	242
Other taxes	[1]	55	63	196	192
Total operating expenses		534	527	2,023	1,634
Operating income (loss)		261	212	(865)	440
Other income (expense), net		(13)	(1)	(27)	124
Interest charges, net of allowance for borrowed funds used during construction	[1]	66	79	202	232
Income (loss) before income tax expense (benefit)		182	132	(1,094)	332
Income tax expense (benefit)		40	29	(63)	70
Net Income (Loss)		142	103	(1,031)	262
Other Comprehensive Income:
Deferred cost of employee benefit plans, net of tax		1	1	1	1
Total Comprehensive Income (Loss)		143	104	(1,030)	263
Comprehensive Income Attributable to Noncontrolling Interest		0	6	14	15
Comprehensive Income (Loss) Available (Attributable) to Common Shareholder		$ 143	$ 98	$ (1,044)	$ 248

[1] See Note 14 for amounts attributable to affiliates.

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Rate and Other Regulatory Matters (Narrative) (Detail) - USD ($) $ in Millions		1 Months Ended			3 Months Ended				9 Months Ended
		Oct. 31, 2019	Jun. 30, 2019	Jul. 31, 2018	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Rate And Other Regulatory Matters [Line Items]
Interest charges	[1]				$ 66		$ 79		$ 202	$ 232
Operating expense					534		$ 527		$ 2,023	$ 1,634
South Carolina Commission order, revenue requirement under RSA			$ 437
South Carolina Commission order, increase in natural gas rates under RSA			$ 7
Regulatory asset recovery assessment end period									2047
Monetization Of Guaranty Settlement [Member]
Rate And Other Regulatory Matters [Line Items]
Electric service customers over period									20 years
End period for recovery									2039
Income Taxes Refundable Through Future Rates [Member]
Rate And Other Regulatory Matters [Line Items]
Remaining lives of related property period									85 years
Deferred Losses or Gains On Interest Rate Derivatives [Member]
Rate And Other Regulatory Matters [Line Items]
Changes in fair value and payments of interest rate derivatives designated as cash flow hedge, amortized to interest expense, year									2043
Changes in fair value and payments of interest rate derivatives not designed, amortized to interest, year									2065
NND Project Costs [Member]
Rate And Other Regulatory Matters [Line Items]
Electric service customers over period									20 years
End period for recovery									2039
Asset Retirement Obligation Costs [Member]
Rate And Other Regulatory Matters [Line Items]
Recovery period of regulatory asset									106 years
Deferred Employee Benefit Plan Costs [Member]
Rate And Other Regulatory Matters [Line Items]
Regulatory asset recovery assessment end period									2044
Average service period expected to recover other deferred benefit costs									11 years
Other Unrecovered Plant [Member]
Rate And Other Regulatory Matters [Line Items]
Remaining useful lives of coal-fired generating units, year									2025
Demand Side Management Programs [Member]
Rate And Other Regulatory Matters [Line Items]
Recovery period of regulatory asset									5 years
Environmental Remediation Costs [Member]
Rate And Other Regulatory Matters [Line Items]
MPG environmental remediation									16 years
Cost of Reacquired Debt [Member]
Rate And Other Regulatory Matters [Line Items]
Recovery period of regulatory asset									26 years
Subsequent Event [Member]
Rate And Other Regulatory Matters [Line Items]
South Carolina Commission order, revenue requirement approved under RSA		$ 436
Electric Operations
Rate And Other Regulatory Matters [Line Items]
Public utilities percentage change in retail electric rates approved under BLRA				18.00%
Public utilities, approved rate increase (decrease), percentage				3.00%
Public utilities, requested rate increase (decrease), amount				$ 31
Operating expense								$ 109
Operating expense after tax								$ 82
Reserve For Refunds To Electric Utility Customers [Member]
Rate And Other Regulatory Matters [Line Items]
Electric service customers over period									11 years
FERC
Rate And Other Regulatory Matters [Line Items]
Interest charges					10	$ 6
Interest charge, after tax					$ 7	$ 4

[1] See Note 14 for amounts attributable to affiliates.

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Operating Segments (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

(millions)	External Revenue			Comprehensive Income (Loss) Available (Attributable) to Common Shareholder
Three Months Ended September 30, 2019
Electric Operations	$	728		$	169
Gas Distribution		67			(1	)
Corporate and Other		—			(25	)
Adjustments/Eliminations		—			—
Consolidated Total	$	795		$	143
Three Months Ended September 30, 2018
Electric Operations	$	670		$	112
Gas Distribution		69			(7	)
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(6	)
Consolidated Total	$	739		$	98
Nine Months Ended September 30, 2019
Electric Operations	$	1,875		$	321
Gas Distribution		292			13
Corporate and Other		(1,009	)		(1,364	)
Adjustments/Eliminations		—			(14	)
Consolidated Total	$	1,158		$	(1,044	)
Nine Months Ended September 30, 2018
Electric Operations	$	1,770		$	242
Gas Distribution		304			22
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(15	)
Consolidated Total	$	2,074		$	248

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Revenue Recognition

9 Months Ended

Sep. 30, 2019

Revenues [Abstract]

Revenue Recognition

3. REVENUE RECOGNITION

DESC has disaggregated operating revenues by customer class as follows:

	Three Months Ended				Three Months Ended				Nine Months Ended				Nine Months Ended
	September 30, 2019				September 30, 2018				September 30, 2019				September 30, 2018
(millions)	Electric		Gas		Electric		Gas		Electric		Gas		Electric		Gas
Customer class:
Residential	$	354	$	24	$	310	$	25	$	364	$	133	$	805	$	145
Commercial		229		19		231		19		296		80		571		80
Industrial		101		18		95		19		119		63		286		64
Other		37		6		31		6		82		13		99		13
Revenues from contracts with    customers		721		67		667		69		861		289		1,761		302
Other revenues		7		—		3		—		8		—		9		1
Total Operating Revenues	$	728	$	67	$	670	$	69	$	869	$	289	$	1,770	$	303

Contract liabilities represent the obligation to transfer goods or services to a customer for which consideration has already been received from the customer. DESC had contract liability balances of $5 million and $4 million at September 30, 2019 and December 31, 2018, respectively. During the nine months ended September 30, 2019, DESC recognized revenue of $3 million from the beginning contract liability balances as DESC fulfilled its obligations to provide service to its customers. Contract liabilities are recorded in customer deposits and customer prepayments in the Consolidated Balance Sheets.

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

7. DERIVATIVE FINANCIAL INSTRUMENTS

DESC’s accounting policies, objectives, and strategies for using derivative instruments are discussed in Note 7 in the Consolidated Financial Statements in DESC’s Annual Report on Form 10-K for the year ended December 31, 2018. Derivative assets and liabilities are presented gross on the Consolidated Balance Sheets and are measured at fair value. See Note 8 for further information about fair value measurements and associated valuation methods for derivatives. Derivative contracts include over-the-counter transactions, which are bilateral contracts that are transacted directly with a third party. In general, most over-the-counter transactions are subject to collateral requirements.

Pursuant to regulatory orders, interest rate derivatives entered into by DESC after October 2013 have not been designated for accounting purposes as cash flow hedges, and fair value changes and settlement amounts related to them have been recorded as regulatory assets and liabilities. Settlement losses on swaps generally have been amortized over the lives of subsequent debt issuances,

and gains have been amortized to interest expense or have been applied as otherwise directed by the South Carolina Commission. See Note 15 regarding the settlement gains realized in the first quarter of 2018.

The table below presents derivative balances by type of financial instrument, if the gross amounts recognized in the Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid:

	September 30, 2019								December 31, 2018
	Gross Amounts Not Offset in the Consolidated Balance Sheet								Gross Amounts Not Offset in the Consolidated Balance Sheet
(millions)	Gross Liabilities Presented in the Consolidated Balance Sheet		Financial Instruments		Cash Collateral Paid		Net Amounts		Gross Liabilities Presented in the Consolidated Balance Sheet		Financial Instruments		Cash Collateral Paid		Net Amounts
Interest rate contracts:
Over-the-counter	$	23	$	—	$	23	$	—	$	11	$	—	$	11	$	—
Total derivatives	$	23	$	—	$	23	$	—	$	11	$	—	$	11	$	—

Volumes

The following table presents the volume of derivative activity at September 30, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions.

	Current		Noncurrent
Interest rate(1)	$	—	$	71,400,000

(1) ^{Maturity is determined based on final settlement period.}

Fair Value and Gains and Losses on Derivative Instruments

The following tables present the fair values of derivatives and where they are presented in the Consolidated Balance Sheets:

(millions)	Fair Value - Derivatives under Hedge Accounting		Fair Value - Derivatives not under Hedge Accounting		Total Fair Value
At September 30, 2019
Current Liabilities
Interest rate	$	1	$	1	$	2
Total current derivative liabilities(1)		1		1		2
Noncurrent Liabilities
Interest rate		13		8		21
Total noncurrent derivative liabilities(2)		13		8		21
Total derivative liabilities	$	14	$	9	$	23
At December 31, 2018
Current Liabilities
Interest rate	$	1	$	—	$	1
Total current derivative liabilities(1)		1		—		1
Noncurrent Liabilities
Interest rate		7		3		10
Total noncurrent derivative liabilities(2)		7		3		10
Total derivative liabilities	$	8	$	3	$	11

(1) Current derivative liabilities are presented in other current liabilities in the Consolidated Balance Sheets.

(2) ^{Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Consolidated Balance Sheets.}

The following tables present the gains and losses on derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Comprehensive Income (Loss):

Derivatives in Cash Flow Hedging Relationships

(millions)	Gain (loss) Reclassified from Deferred Accounts into Income			Increase (Decrease) in Derivatives Subject to Regulatory Treatment(1)
Three Months Ended September 30, 2019
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	(1	)
Total	$	—		$	(1	)
Three Months Ended September 30, 2018
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	—
Total	$	—		$	—
Nine Months Ended September 30, 2019
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	(3	)
Total	$	—		$	(3	)
Nine Months Ended September 30, 2018
Derivative type and location of gains (losses):
Interest rate(2)	$	(1	)	$	2
Total	$	(1	)	$	2

(1) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/ liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

(2) Amounts recorded in DESC’s Consolidated Statements of Comprehensive Income (Loss) are classified in interest charges.

Derivatives Not designated as Hedging Instruments

(millions)	Increase (Decrease) in Derivatives Subject to Regulatory Treatment(1)						Amount of Gain (Loss) Recognized in Income on Derivatives(2)
Three Months Ended September 30,	2019			2018		Location	2019			2018
Derivative type and location of gains (losses):
Interest rate contracts:						Interest charges	$	(1	)	$	(1	)
Total interest rate contracts	$	(2	)	$	1		$	(1	)	$	(1	)
Nine Months Ended September 30,
Derivative type and location of gains (losses):
Interest rate contracts:						Interest charges	$	(1	)	$	(2	)
						Other income		—			115
Total interest rate contracts	$	(5	)	$	66		$	(1	)	$	113

(1) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

(2) ^{Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).}

Credit Risk Considerations

Certain derivative contracts contain contingent credit features. These features may include (i) material adverse change clauses or payment acceleration clauses that could result in immediate payments or (ii) the posting of letters of credit or termination of the derivative contract before maturity if specific events occur, such as a credit rating downgrade below investment grade or failure to post collateral.

Derivative Contracts with Credit Contingent Features

(millions)	September 30, 2019		December 31, 2018
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	23	$	11
Fair value of collateral already posted		23		11
Additional cash collateral or letters of credit in the event credit-risk-related    contingent features were triggered	$	—	$	—

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Commitments And Contingencies

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

11. COMMITMENTS AND CONTINGENCIES

As a result of issues generated in the ordinary course of business, DESC is involved in legal proceedings before various courts and is periodically subject to governmental examinations (including by regulatory authorities), inquiries and investigations. Certain legal proceedings and governmental examinations involve demands for unspecified amounts of damages, are in an initial procedural phase, involve uncertainty as to the outcome of pending appeals or motions, or involve significant factual issues that need to be resolved, such that it is not possible for DESC to estimate a range of possible loss. For such matters that DESC cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the litigation or investigative processes such that DESC is able to estimate a range of possible loss. For legal proceedings and governmental examinations that DESC is able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any accrued liability is recorded on a gross basis with a receivable also recorded for any probable insurance recoveries. Estimated ranges of loss are inclusive of legal fees and net of any anticipated insurance recoveries. Any estimated range is based on currently available information and involves elements of judgment and significant uncertainties. Any estimated range of possible loss may not represent DESC’s maximum possible loss exposure. The circumstances of such legal proceedings and governmental examinations will change from time to time and actual results may vary significantly from the current estimate. For current proceedings not specifically reported below, management does not anticipate that the liabilities, if any, arising from such proceedings would have a material effect on DESC’s financial position, liquidity or results of operations.

Environmental

In July 2019, the EPA published the ACE Rule, which repeals and replaces the Clean Power Plan. The ACE Rule became effective in September 2019. The final ACE Rule applies to coal-fired steam electric generating units greater than or equal to 25 MW. The rule includes unit-specific performance standards based on the degree of emission reduction levels achievable from unit efficiency improvements to be determined by the permitting agency. The ACE Rule requires states to develop plans by July 2022 to implement these performance standards, which plans must be approved by the EPA by January 2024. DESC is currently evaluating the ACE Rule for potential impact at its coal fired units and expects any costs incurred to comply with such rule to be recoverable through rates. While the impacts of this rule could be material to DESC’s results of operations, financial condition and/or cash flows, the existing regulatory framework in South Carolina provides rate recovery mechanisms that could substantially mitigate any such impacts.

In July 2011, the EPA issued the CSAPR to reduce emissions of SO₂ and NO_X from power plants in the eastern half of the U.S. The CSAPR replaces the Clean Air Interstate Rule and requires a total of 28 states to reduce annual SO₂ emissions and annual ozone season NO_X emissions to assist in attaining the ozone and fine particle National Ambient Air Quality Standards. The rule establishes an emissions cap for SO₂ and NO_X and limits the trading for emission allowances by separating affected states into two groups with no trading between the groups. The State of South Carolina has chosen to remain in the CSAPR program, even though recent court rulings exempted the state. This allows the state to remain compliant with regional haze standards. Air quality control installations that DESC has already completed have positioned them to comply with the existing allowances set by the CSAPR. Any costs incurred to comply with CSAPR are expected to be recoverable through rates.

In February 2019, the EPA published a proposed rule to reverse its previous finding that it is appropriate and necessary to regulate toxic emissions from power plants. However, the emissions standards and other requirements of the MATS rule would remain in place as the EPA is not proposing to remove coal and oil fired power plants from the list of sources that are regulated under MATS. Although litigation of the MATS rule and the outcome of the EPA’s rulemaking are still pending, the regulation remains in effect and DESC is complying with the applicable requirements of the rule and does not expect any adverse impacts to its operations at this time due to plant retirements, conversions and enhancements.

The CWA provides for the imposition of effluent limitations that require treatment for wastewater discharges. Under the CWA, compliance with applicable limitations is achieved under state-issued NPDES permits such that, as a facility’s NPDES permit is renewed, any new effluent limitations would be incorporated. The ELG Rule was final in September 2015, after which state regulators are required to modify facility NPDES permits to match more restrictive standards, which would require facilities to retrofit with new wastewater treatment technologies. Compliance dates varied by type of wastewater, and some were based on a facility's five-year permit cycle and thus could range from 2018 to 2023. However, the ELG Rule is under reconsideration by the EPA and has been stayed administratively. The EPA has decided to conduct a new rulemaking that could result in revisions to certain flue gas desulfurization wastewater and bottom ash transport water requirements in the ELG Rule. Accordingly, in September 2017 the EPA finalized a rule that postpones compliance dates under the ELG Rule to a range from November 2020 to December 2023. The EPA indicates that the new rulemaking process may take up to three years to complete, such that any revisions to the ELG Rule likely would not be final until the summer of 2020. While DESC expects that wastewater treatment technology retrofits will be required at Williams and Wateree generating stations, any costs incurred to comply with the ELG Rule are expected to be recoverable through rates.

The CWA Section 316(b) Existing Facilities Rule became effective in October 2014. This rule establishes national requirements for the location, design, construction and capacity of cooling water intake structures at existing facilities that reflect the best technology available for minimizing the adverse environmental impacts of impingement and entrainment. DESC is conducting studies and implementing plans as required by the rule to determine appropriate intake structure modifications at certain facilities to ensure compliance with this rule. Any costs incurred to comply with this rule are expected to be recoverable through rates.

The EPA's final rule for CCR became effective in the fourth quarter of 2015. This rule regulates CCR as a non-hazardous waste under Subtitle D of the Resource Conservation and Recovery Act and imposes certain requirements on ash storage ponds and other CCR management facilities at certain of DESC's coal-fired generating facilities. DESC has already closed or has begun the process of closure of all of its ash storage ponds and has previously recognized AROs for such ash storage ponds under existing requirements. DESC does not expect the incremental compliance costs associated with this rule to be significant and expect to recover such costs in future rates.

DESC is responsible for four decommissioned MGP sites in South Carolina which contain residues of by-product chemicals. These sites are in various stages of investigation, remediation and monitoring under work plans approved by or under review by SCDHEC and the EPA. DESC anticipates that major remediation activities at all of these sites will continue at least through 2022 and will cost an additional $10 million. In February 2019, SCDHEC directed DESC to pursue a stakeholder-developed modified removal action plan for one site (Congaree River). DESC is developing an engineering design for this plan, which would require permits from the U.S. Army Corps of Engineers and others and further approvals before it could be implemented. If DESC receives the necessary permits and approvals for this plan, remediation cost for the Congaree River site would increase by $8 million. DESC cannot predict if or when such permits or approvals will be received. Major remediation activities are accrued in other within deferred credits and other liabilities on the Consolidated Balance Sheets. DESC expects to recover any cost arising from the remediation of MGP sites through rates. At September 30, 2019, deferred amounts, net of amounts previously recovered through rates and insurance settlements, totaled $23 million and are included in regulatory assets.

Abandoned NND Project

A description of events and circumstances leading up to DESC's abandonment of the NND Project and subsequent regulatory, legislative, legal and investigative proceedings, as well as related impairments of NND Project and other costs are described in Note 11 in DESC's Annual Report on Form 10-K for the year ended December 31, 2018.

SCANA Merger Approval Order

In accordance with the terms of the South Carolina Commission's SCANA Merger Approval Order, DESC adopted the Plan-B Levelized Customer Benefits Plan, effective February 2019, whereby the average bill for a DESC residential electric customer approximates that which resulted from the legislatively-mandated temporary reduction that had been put into effect by the South Carolina Commission in August 2018. DESC also recorded a significant impairment charge in the fourth quarter of 2018, which charge resulted from its conclusion that NND Project capital costs exceeding the amount established in the SCANA Merger Approval Order were probable of loss, regardless of whether the SCANA Combination was completed. In addition, in the first quarter of 2019, DESC recorded the following charges and liabilities which arose from or are related to provisions in the SCANA Merger Approval Order.

• A charge of $105 million ($79 million after-tax) related to certain assets that had been constructed in connection with the NND Project for which DESC committed to forgo recovery.

• A regulatory liability for refunds and restitution of amounts previously collected from retail electric customers of $1.0 billion ($756 million after-tax), recorded as a reduction in operating revenue, which will be credited to customers over an estimated 11 years. In addition, a previously existing regulatory liability of $1.0 billion will be credited to customers over 20 years, which reflects amounts to be refunded to customers related to the monetization of guaranty settlement described in Note 2.

• A regulatory liability for refunds to natural gas customers totaling $2 million ($2 million after-tax).

• A tax charge of $198 million related to $264 million of regulatory assets for which DESC committed to forgo recovery.

Further, except for rate adjustments for fuel and environmental costs, DSM costs, and other rates routinely adjusted on an annual or biannual basis, DESC will freeze retail electric base rates at current levels until January 1, 2021.

The South Carolina Commission order also approved the removal of DESC's investment in certain transmission assets that have not been abandoned from BLRA capital costs. As of September 30, 2019, such investment in these assets included $345 million within utility plant, net and $32 million within regulatory assets, which amount represents certain deferred operating costs. The South Carolina Commission approved deferral of these operating costs related to the investment until recovery of the transmission capital costs and associated deferred operating costs is addressed in a future rate proceeding. DESC believes these transmission capital and deferred operating costs are probable of recovery; however, if the South Carolina Commission were to disallow recovery of or a reasonable return on all or a portion of them, an impairment charge equal to the disallowed costs may be required.

Various parties filed petitions for rehearing or reconsideration of the SCANA Merger Approval Order. In January 2019, the South Carolina Commission issued an order (1) granting the request of various parties and finding that DESC was imprudent in its actions by not disclosing material information to the South Carolina Office of Regulatory Staff and the South Carolina Commission with regard to costs incurred subsequent to March 2015 and (2) denying the petitions for rehearing or consideration as to other issues raised in the various petitions. The deadline to appeal the SCANA Merger Approval Order and the order on rehearing expired in April 2019, and no party has sought appeal.

Claims and Litigation

The following describes certain legal proceedings involving DESC relating to events occurring before closing of the SCANA Combination. Dominion Energy intends to vigorously contest the lawsuits, claims and assessments which have been filed or initiated against DESC. No reference to, or disclosure of, any proceeding, item or matter described below shall be construed as an admission or indication that such proceeding, item or matter is material. For certain of these matters, and unless otherwise noted therein, DESC is unable to estimate a reasonable range of possible loss and the related financial statement impacts, but for any such matter there could be a material impact to its results of operations, financial condition and/or cash flows.  For the matters for which DESC is able to reasonably estimate a probable loss, the Consolidated Balance Sheets include reserves of $181 million included within reserves for litigation and regulatory proceedings and insurance receivables of $18 million included within other receivables at September 30, 2019.  During the nine months ended September 30, 2019, the Consolidated Statements of Comprehensive Income (Loss) includes charges of $266 million ($200 million after-tax), included within impairment of assets and other charges.

Ratepayer Class Actions

In May 2018, a consolidated complaint against DESC, SCANA and the State of South Carolina was filed in the State Court of Common Pleas in Hampton County, South Carolina (the DESC Ratepayer Case). In September 2018, the court certified this case as a class action. The plaintiffs allege, among other things, that DESC was negligent and unjustly enriched, breached alleged fiduciary and contractual duties and committed fraud and misrepresentation in failing to properly manage the NND Project, and that DESC committed unfair trade practices and violated state anti-trust laws. The plaintiffs sought a declaratory judgment that DESC may not charge its customers for any past or continuing costs of the NND Project, sought to have SCANA and DESC’s assets frozen and all monies recovered from Toshiba and other sources be placed in a constructive trust for the benefit of ratepayers and sought specific performance of the alleged implied contract to construct the NND Project.

In December 2018, the State Court of Common Pleas in Hampton County entered an order granting preliminary approval of a class action settlement and a stay of pre-trial proceedings in the DESC Ratepayer Case. The settlement agreement, contingent upon the closing of the SCANA Combination, provided that SCANA and DESC would establish an escrow account and proceeds from the escrow account would be distributed to the class members, after payment of certain taxes, attorneys' fees and other expenses and administrative costs. The escrow account would include (1) up to $2.0 billion, net of a credit of up to $2.0 billion in future electric bill relief, which would inure to the benefit of the escrow account in favor of class members over a period of time established by the South Carolina Commission in its order related to matters before the South Carolina Commission related to the NND Project, (2) a cash payment of $115 million and (3) the transfer of certain DESC-owned real estate or sales proceeds from the sale of such properties, which counsel for the DESC Ratepayer Class estimate to have an aggregate value between $60 million and $85 million. At the closing of the SCANA Combination, SCANA and DESC funded the cash payment portion of the escrow account. The court held a fairness hearing on the settlement in May 2019. In June 2019, the court entered an order granting final approval of the settlement, which order became effective July 2019. In July 2019, DESC transferred $117 million representing the cash payment, plus accrued interest, to the plaintiffs. In addition, property with a net recorded value of $42 million is in the process of being transferred to the plaintiffs in coordination with the court-appointed real estate trustee to satisfy the settlement agreement.

In September 2017, a purported class action was filed by Santee Cooper ratepayers against Santee Cooper, DESC, Palmetto Electric Cooperative, Inc. and Central Electric Power Cooperative, Inc. in the State Court of Common Pleas in Hampton County, South Carolina (the Santee Cooper Ratepayer Case). The allegations are substantially similar to those in the DESC Ratepayer Case. The plaintiffs seek a declaratory judgment that the defendants may not charge the purported class for reimbursement for past or future costs of the NND Project. In March 2018, the plaintiffs filed an amended complaint including as additional named defendants certain then current and former directors of Santee Cooper and SCANA. In June 2018, Santee Cooper filed a Notice of Petition for Original Jurisdiction with the Supreme Court of South Carolina which was denied. In December 2018, Santee Cooper filed its answer to the plaintiffs' fourth amended complaint and filed cross claims against DESC. In October 2019, Santee Cooper voluntarily consented to stay its cross claims against DESC pending the outcome of the trial of the underlying case. This case is pending.

In July 2019, a similar purported class action was filed by certain Santee Cooper ratepayers against DESC, SCANA, Dominion Energy and former directors and officers of SCANA in the State Court of Common Pleas in Orangeburg, South Carolina.  In August 2019, DESC, SCANA and Dominion Energy were voluntarily dismissed from the case. The claims are similar to the Santee Cooper Ratepayer Case. This case is pending.

RICO Class Action

In January 2018, a purported class action was filed, and subsequently amended, against SCANA, DESC and certain former executive officers in the U.S. District Court for the District of South Carolina. The plaintiff alleges, among other things, that SCANA, DESC and the individual defendants participated in an unlawful racketeering enterprise in violation of RICO and conspired to violate RICO by fraudulently inflating utility bills to generate unlawful proceeds. The DESC Ratepayer Class Action settlement described previously contemplates dismissal of claims by DESC ratepayers in this case against DESC, SCANA and their officers. In August 2019, the individual defendants filed motions to dismiss. This case is pending.

SCANA Shareholder Litigation

In February 2018, a purported class action was filed against Dominion Energy and certain former directors of SCANA and DESC in the State Court of Common Pleas in Richland County, South Carolina (the Metzler Lawsuit). The plaintiff alleges, among other things, that defendants violated their fiduciary duties to shareholders by executing a merger agreement that would unfairly deprive plaintiffs of the true value of their SCANA stock, and that Dominion Energy aided and abetted these actions. Among other remedies, the plaintiff seeks to enjoin and/or rescind the merger. In February 2018, Dominion Energy removed the case to the U.S. District Court for the District of South Carolina and filed a Motion to Dismiss in March 2018. In August 2018, the case was remanded back to the State Court of Common Pleas in Richland County. Dominion Energy appealed the decision to remand to the U.S. Court of Appeals for the Fourth Circuit, where the appeal was consolidated with another lawsuit regarding the SCANA Merger Agreement to which DESC is not a party. In June 2019, the U.S. Court of Appeals for the Fourth Circuit reversed the order remanding the case to state court. The case is pending in the U.S. District Court for the District of South Carolina.

Employment Class Actions and Indemnification

In August 2017, a case was filed in the U.S. District Court for the District of South Carolina on behalf of persons who were formerly employed at the NND Project. In July 2018, the court certified this case as a class action. In February 2019, certain of these plaintiffs filed an additional case, which case has been dismissed and the plaintiffs have joined the case filed in August 2017. The plaintiffs allege, among other things, that SCANA, DESC, Fluor Corporation and Fluor Enterprises, Inc. violated the Worker Adjustment and Retraining Notification Act in connection with the decision to stop construction at the NND Project. The plaintiffs allege that the defendants failed to provide adequate advance written notice of their terminations of employment and are seeking damages, which could be as much as $100 million for 100% of the NND Project.

In September 2018, a case was filed in the State Court of Common Pleas in Fairfield County, South Carolina by Fluor Enterprises, Inc. and Fluor Daniel Maintenance Services, Inc. against DESC and Santee Cooper. The plaintiffs make claims for indemnification, breach of contract and promissory estoppel arising from, among other things, the defendants' alleged failure and refusal to defend and indemnify the Fluor defendants in the aforementioned case. These cases are pending.

FILOT Litigation and Related Matters

In November 2017, Fairfield County filed a complaint and a motion for temporary injunction against DESC in the State Court of Common Pleas in Fairfield County, South Carolina, making allegations of breach of contract, fraud, negligent misrepresentation, breach of fiduciary duty, breach of implied duty of good faith and fair dealing and unfair trade practices related to DESC’s termination of the FILOT agreement between DESC and Fairfield County related to the NND Project. The plaintiff sought a temporary and permanent injunction to prevent DESC from terminating the FILOT agreement. The plaintiff withdrew the motion for temporary injunction in December 2017. This case is pending.

Governmental Proceedings and Investigations

In June 2018, DESC received a notice of proposed assessment of approximately $410 million, excluding interest, from the SCDOR following its audit of DESC’s sales and use tax returns for the periods September 1, 2008 through December 31, 2017. The proposed assessment, which includes 100% of the NND Project, is based on the SCDOR’s position that DESC’s sales and use tax exemption for the NND Project does not apply because the facility will not become operational. DESC has protested the proposed assessment, which remains pending.

In September and October 2017, SCANA was served with subpoenas issued by the U.S. Attorney’s Office for the District of South Carolina and the Staff of the SEC’s Division of Enforcement seeking documents related to the NND Project. In addition, the South Carolina Law Enforcement Division is conducting a criminal investigation into the handling of the NND Project by SCANA and DESC. These matters are pending. SCANA and DESC are cooperating fully with the investigations, including responding to additional subpoenas and document requests.

Other Litigation

In December 2018, arbitration proceedings commenced between DESC and Cameco Corporation related to a supply agreement signed in May 2008. This agreement provides the terms and conditions under which DESC agreed to purchase uranium hexafluoride from Cameco Corporation over a period from 2010 to 2020. Cameco Corporation alleges that DESC violated this agreement by failing to purchase the stated quantities of uranium hexafluoride for the 2017 and 2018 delivery years. DESC denies that it is in breach of the agreement and believes that it has reduced its purchase quantity within the terms of the agreement. This matter is pending.

In September 2019, a South Carolina state court jury awarded a judgment to the estate of Jose Larios in a wrongful death suit filed in June 2017 against DESC, of which DESC was apportioned $19 million.  DESC holds general liability insurance coverage which is expected to provide payment for substantially all DESC’s liability in this matter. In October 2019, DESC filed a motion requesting a reduction in the judgment or, in the alternative, a new trial. In November 2019, DESC’s motion for a new trial was granted, setting aside the entire verdict amount. This matter is pending.  

Contractor Bankruptcy Proceedings

Westinghouse’s Reorganization Plan became effective August 1, 2018. Initially, Westinghouse had projected that its Reorganization Plan would pay in full or nearly in full its pre-petition trade creditors, including several of the Westinghouse Subcontractors which have alleged non-payment by the Consortium for amounts owed for work performed on the NND Project and have filed liens on related property in Fairfield County, South Carolina. DESC is contesting approximately $285 million of such filed liens. Most of these asserted liens are “pre-petition” claims that relate to work performed by Westinghouse Subcontractors before the Westinghouse bankruptcy, although some of them are “post-petition” claims arising from work performed after the Westinghouse bankruptcy. It is possible that the Reorganization Plan will not provide for payment in full or nearly in full to its pre-petition trade creditors. The shortfall could be significant. In addition, payments under the Toshiba Settlement are subject to reduction if Westinghouse pays Westinghouse Subcontractors holding pre-petition liens directly. Under these circumstances, DESC and Santee Cooper, each in its pro rata share, would be required to make Citibank, N.A., which purchased the scheduled payments under the Toshiba Settlement, whole for reductions related to valid subcontractor and vendor pre-petition liens up to $60 million ($33 million for DESC's 55% share).

DESC and Santee Cooper are responsible for amounts owed to Westinghouse for valid work performed by Westinghouse Subcontractors on the NND Project after the Westinghouse bankruptcy filing (i.e., post-petition) until termination of the IAA (the IAA Period). In the Westinghouse bankruptcy proceeding, deadlines were established for creditors of Westinghouse to assert the amounts owed to such creditors prior to the Westinghouse bankruptcy filing and during the IAA Period. Many of the Westinghouse Subcontractors have filed such claims. DESC does not believe that the claims asserted related to the IAA Period will exceed the amounts previously funded for the currently asserted IAA-related claims, whether relating to claims already paid or those remaining to be paid. DESC intends to oppose any previously unasserted claim that is asserted against it, whether directly or indirectly by a claim through the IAA.

Further, some Westinghouse Subcontractors who have made claims against Westinghouse in the bankruptcy proceeding also filed against DESC and Santee Cooper in South Carolina state court for damages. The Westinghouse Subcontractor claims in South Carolina state court include common law claims for pre-petition work, IAA Period work, and work after the termination of the IAA. Many of these claimants have also asserted construction liens against the NND Project site. While DESC cannot be assured that it will not have any exposure on account of unpaid Westinghouse Subcontractor claims, which claims DESC is presently disputing, DESC believes it is unlikely that it will be required to make payments on account of such claims.

Nuclear Insurance

Under Price-Anderson, DESC (for itself and on behalf of Santee-Cooper) maintains agreements of indemnity with the U.S. Nuclear Regulatory Commission that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at Summer. Price-Anderson provides funds up to $14.0 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $450 million by American Nuclear Insurers with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. Each reactor licensee is liable for up to $138 million per reactor owned for each nuclear incident occurring at any reactor in the U.S., provided that not more than $21 million of the liability per reactor would be assessed per year. DESC’s maximum assessment, based on its two-thirds ownership of Summer, would be $92 million per incident, but not more than $14 million per year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years.

DESC currently maintains insurance policies (for itself and on behalf of Santee Cooper) with NEIL. The policies provide coverage to Summer for property damage and outage costs up to $2.75 billion resulting from an event of nuclear origin and up to $2.33 billion resulting from an event of a non-nuclear origin. The NEIL policies in aggregate, are subject to a maximum loss of $2.75 billion for any single loss occurrence. The NEIL policies permit retrospective assessments under certain conditions to cover insurer’s losses. Based on the current annual premium, DESC’s portion of the retrospective premium assessment would not exceed $24 million. DESC currently maintains an excess property insurance policy (for itself and on behalf of Santee Cooper) with EMANI. The policy provides coverage to Summer for property damage and outage costs up to $415 million resulting from an event of a non-nuclear origin. The EMANI policy permits retrospective assessments under certain conditions to cover insurer's losses. Based on the current annual premium, DESC's portion of the retrospective premium assessment would not exceed $2 million.

To the extent that insurable claims for property damage, decontamination, repair and replacement and other costs and expenses arising from an incident at Summer exceed the policy limits of insurance, or to the extent such insurance becomes unavailable in the future, and to the extent that DESC's rates would not recover the cost of any purchased replacement power, DESC will retain the risk of loss as a self-insurer. DESC has no reason to anticipate a serious nuclear or other incident. However, if such an incident were to occur, it likely would have a material impact on DESC's results of operations, cash flows and financial position.  

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Other Income (Expense), Net (Components of Other Income (Expense), Net) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Statement Of Income Captions [Line Items]
Operating revenue from contracts with customers	$ 1	$ 1	$ 4	$ 4
Other income	11	5	17	135
Other expense	(23)	(10)	(48)	(22)
Allowance for equity funds used during construction	(2)	3	0	7
Other income (expense), net	$ (13)	$ (1)	$ (27)	124
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Condensed Statement Of Income Captions [Line Items]
Gains from settlement of interest rate derivatives				115
Other Income [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Condensed Statement Of Income Captions [Line Items]
Gains from settlement of interest rate derivatives				$ 115

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Fair Value Measurements, Including Derivatives (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Detail) - USD ($) $ in Millions		Sep. 30, 2019		Dec. 31, 2018
Fair Value Disclosures [Abstract]
Long-term debt, carrying amount	[1]	$ 3,615		$ 5,146
Long-term debt, estimated fair value	[1]	$ 4,601	[2]	$ 5,470	[3]

[1] Carrying amount includes amounts which represent the unamortized debt issuance costs and discount or premium.

[2] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

[3] Fair value is estimated based on net present value calculations using independently sourced market data that incorporate a developed discount rate using similarly rated long-term debt, along with benchmark interest rates. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

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Commitments and Contingencies (Narrative) (Detail)	1 Months Ended					3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) State MW	Jul. 31, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) State Product MW	Sep. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Number of states required to reduce emissions under CSAPR | State	28						28
Number of MGP decommissioned sites that contain residues of byproduct chemicals | Product							4
Estimated environmental remediation activities at MGP sites							$ 10,000,000
Estimated increase in remediation costs for Congaree River site							8,000,000
Environmental remediation costs recognized in regulatory assets	$ 23,000,000						23,000,000
Impairment of assets and other charges						$ 105,000,000	256,000,000	$ 4,000,000
Asset impairment charges after tax						79,000,000
Customer refundable fees, alternative plan	3,549,000,000			$ 2,390,000,000			3,549,000,000
Regulatory liability for refunds to natural gas customers						2,000,000
Regulatory liability for refunds to natural gas customers, after tax						2,000,000
Regulatory asset impairment charges committed to forgo recovery						264,000,000
Tax charge related to regulatory assets committed to forgo recovery						198,000,000
Transmission assets related to BLRA capital costs	345,000,000						345,000,000
Transmission assets related to BLRA regulatory assets	32,000,000						32,000,000
Reserves for litigation and regulatory proceedings	181,000,000			11,000,000			181,000,000
Insurance receivables	18,000,000						18,000,000
Amount claimed by plaintiffs in legal matter			$ 100,000,000
Proportionate ownership share in project			100.00%		100.00%
Proposed assessment amount from SCDOR audit					$ 410,000,000
Contesting amount for filed liens in Fairfield country							285,000,000
Reduction of liens filed							$ 60,000,000
Percentage share of reduction of liens filed							55.00%
Nuclear Insurance
Loss Contingencies [Line Items]
Maximum liability protection per nuclear incident amount							$ 14,000,000,000.0
Maximum liability each nuclear plant is insured against	450,000,000						$ 450,000,000
Inflation adjustment period for nuclear insurance							5 years
NEIL maximum insurance coverage to nuclear facility for property damage and outage costs	2,750,000,000						$ 2,750,000,000
NEIL maximum insurance coverage to nuclear facility for property damage and outage costs from non-nuclear event							2,330,000,000
NEIL aggregate maximum loss for any single loss occurrence	2,750,000,000						2,750,000,000
NEIL maximum retrospective premium assessment							24,000,000
EMANI maximum insurance coverage for Summer station unit 1 for property damage and outage costs from non-nuclear event							415,000,000
EMANI maximum retrospective premium assessment							2,000,000
Dominion Energy South Carolina, Inc.
Loss Contingencies [Line Items]
Reduction of liens filed							33,000,000
Impairment of Assets and Other Charges | Dominion Energy South Carolina, Inc.
Loss Contingencies [Line Items]
Impairment of assets and other charges							266,000,000
Asset impairment charges after tax							$ 200,000,000
DESC Ratepayer Case
Loss Contingencies [Line Items]
Customer refundable fees, alternative plan						1,000,000,000.0
Customer refund fees alternative plan after tax						$ 756,000,000
Customer refunded estimated period						11 years
Previous existing regulatory liability						$ 1,000,000,000.0
Previous existing regulatory liability, years						20 years
Escrow amount				2,000,000,000.0
Credit in future electric rate relief for ratepayer case				2,000,000,000.0
Cash payment related to Ratepayer Case		$ 117,000,000		115,000,000
Property with net value transferred		$ 42,000,000
Wrongful Death Suit of Estate of Jose Larios | Dominion Energy South Carolina, Inc.
Loss Contingencies [Line Items]
Litigation settlement expense awarded	$ 19,000,000
Minimum [Member]
Loss Contingencies [Line Items]
Power Generation Capacity Megawatts | MW	25						25
Minimum [Member] | DESC Ratepayer Case
Loss Contingencies [Line Items]
Estimated aggregate value of certain real estate				60,000,000
Maximum [Member] | Nuclear Insurance
Loss Contingencies [Line Items]
Amount that could be assessed for each licensed reactor	$ 138,000,000						$ 138,000,000
Amount that could be assessed for each licensed reactor per year							21,000,000
Maximum [Member] | DESC Summer | Nuclear Insurance
Loss Contingencies [Line Items]
Amount that could be assessed for each licensed reactor	$ 92,000,000						92,000,000
Amount that could be assessed for each licensed reactor per year							$ 14,000,000
Maximum [Member] | DESC Ratepayer Case
Loss Contingencies [Line Items]
Estimated aggregate value of certain real estate				$ 85,000,000

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Rate and Other Regulatory Matters (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Regulatory Assets
Regulatory assets, current	$ 322	$ 224
Regulatory assets, noncurrent	3,970	4,060
Total regulatory assets	4,292	4,284
NND Project Costs [Member]
Regulatory Assets
Regulatory assets, current	138	127
Regulatory assets, noncurrent	2,537	2,641
Income Taxes Recoverable Through Future Rates [Member]
Regulatory Assets
Regulatory assets, current	52	0
Deferred Employee Benefit Plan Costs [Member]
Regulatory Assets
Regulatory assets, current	13	16
Regulatory assets, noncurrent	205	256
Other Unrecovered Plant [Member]
Regulatory Assets
Regulatory assets, current	14	14
Regulatory assets, noncurrent	70	79
Demand Side Management Programs [Member]
Regulatory Assets
Regulatory assets, current	16	14
Regulatory assets, noncurrent	53	51
Other Regulatory Assets [Member]
Regulatory Assets
Regulatory assets, current	89	53
Regulatory assets, noncurrent	113	123
Asset Retirement Obligation Costs [Member]
Regulatory Assets
Regulatory assets, noncurrent	315	380
Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Assets
Regulatory assets, noncurrent	310	442
Cost of Reacquired Debt [Member]
Regulatory Assets
Regulatory assets, noncurrent	271	14
Environmental Remediation Costs [Member]
Regulatory Assets
Regulatory assets, noncurrent	21	24
Deferred Storm Damage Costs [Member]
Regulatory Assets
Regulatory assets, noncurrent	43	35
Deferred Transmission Operating Costs [Member]
Regulatory Assets
Regulatory assets, noncurrent	$ 32	$ 15

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Affiliated and Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2019

Related Party Transactions [Abstract]

Schedule of Affiliated Transactions

Amounts expensed are primarily recorded in other operations and maintenance - affiliated suppliers and other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss).

	Three Months Ended September 30,				Nine Months Ended September 30,
(millions)	2019		2018		2019		2018
Purchases of coal from affiliate	$	38	$	45	$	100	$	123
Sales of coal to affiliate		37		45		99		122
Purchases of fuel used in electric generation from affiliate		—		35		43		95
Direct and allocated costs from services company affiliate(1)		67		73		207		208
Operating Revenues - Electric from sales to affiliate		1		1		3		3
Operating Expenses - Other taxes from affiliate		2		2		5		4

(1) ^{Includes capitalized expenditures of $13 million and $10 million for the three months ended September 30, 2019 and 2018, and $33 million and $29 million for the nine months ended September 30, 2019 and 2018, respectively.}

Schedule of Affiliated Transactions

(millions)	September 30, 2019		December 31, 2018
Receivable from Canadys Refined Coal, LLC	$	13	$	7
Payable to Canadys Refined Coal, LLC		13		7
Payable to SCANA Energy Marketing, Inc.		—		14
Payable to DESS		47		38

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

10. EMPLOYEE BENEFIT PLANS

Components of net periodic benefit cost recorded by DESC were as follows:

(millions)	Pension Benefits						Other Postretirement Benefits
Three Months Ended September 30,	2019			2018			2019		2018
Service cost	$	4		$	5		$	1	$	1
Interest cost		6			7			2		2
Expected return on assets		(11	)		(12	)		—		—
Amortization of actuarial losses (gains)		2			3			—		(1	)
Settlement loss(1)		11			—			—		—
Net periodic benefit cost	$	12		$	3		$	3	$	2
Nine Months Ended September 30,
Service cost	$	11		$	13		$	2	$	3
Interest cost		21			22			6		6
Expected return on assets		(31	)		(36	)		—		—
Amortization of actuarial losses		9			8			—		—
Curtailment(1)		6			—			3		—
Settlement loss(1)		11			—			—		—
Net periodic benefit cost	$	27		$	7		$	11	$	9

(1) Related to a voluntary retirement program.

No significant contribution to the pension trust is expected for the remainder of 2019 based on current market conditions and assumptions, nor is a limitation on benefit payments expected to apply. DESC recovers current pension costs through either a rate rider that may be adjusted annually for retail electric operations or through cost of service rates for gas operations.

Voluntary Retirement Program

In March 2019, Dominion Energy announced a voluntary retirement program to employees, including employees of DESC, that meet certain age and service requirements. The voluntary retirement program will not compromise safety or DESC’s ability to comply with applicable laws and regulations. In the second quarter of 2019, upon the determinations made concerning the number of employees that elected to participate in the program, DESC recorded a charge of $62 million ($47 million after-tax), of which $50 million was included within other operations and maintenance expense, $3 million within other taxes and $9 million within other income (expense), net. In addition, as a result of the voluntary retirement program, DESC recorded pension plan settlement losses of $11 million within other income (expense), net in the third quarter of 2019. DESC expects to recognize additional pension plan settlement losses in the fourth quarter of 2019. While DESC is currently unable to estimate the amount of such additional settlement losses, they could be material to its results of operations and financial condition.

In the second quarter of 2019, DESC remeasured its pension and other postretirement benefit plans as a result of the voluntary retirement program.  The remeasurement resulted in an increase in the pension benefit obligation of $16 million and an increase in the accumulated postretirement benefit obligation of $10 million. In addition, the remeasurement resulted in an increase in the fair value of pension plan assets of $27 million. The impact of the remeasurement on net periodic benefit cost was recognized prospectively from the remeasurement date. The remeasurement is expected to increase the net periodic benefit cost for 2019 by approximately $1 million, excluding the impacts of curtailments. The discount rate used for the remeasurement was 4.07% for the pension plan and 4.08% for the other postretirement benefit plan. All other assumptions used for the remeasurement were consistent with the measurement as of December 31, 2018.  

In the third quarter of 2019, DESC remeasured a pension plan as a result of a settlement from the voluntary retirement program. The settlement and related remeasurement resulted in an increase in the pension benefit obligation of $25 million and an increase in the fair value of the pension plan assets of $35 million for DESC. The impact of the remeasurement on net periodic benefit cost (credit) was recognized prospectively from the remeasurement date. The remeasurement is expected to decrease the net periodic benefit cost

for 2019 by $4 million. The discount rate used for the remeasurement was 3.57%. All other assumptions used for the remeasurement were consistent with the measurement as of December 31, 2018.  

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Rate and Other Regulatory Matters

9 Months Ended

Sep. 30, 2019

Regulated Operations [Abstract]

Rate and Other Regulatory Matters

2. RATE AND OTHER REGULATORY MATTERS

Regulatory Matters Involving Potential Loss Contingencies

As a result of issues generated in the ordinary course of business, DESC is involved in various regulatory matters. Certain regulatory matters may ultimately result in a loss; however, as such matters are in an initial procedural phase, involve uncertainty as to the outcome of pending reviews or orders, and/or involve significant factual issues that need to be resolved, it is not possible for DESC to estimate a range of possible loss. For regulatory matters that DESC cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the regulatory process such that DESC is able to estimate a range of possible loss. For regulatory matters that DESC is able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any estimated range is based on currently available information, involves elements of judgment and significant uncertainties and may not represent DESC’s maximum possible loss exposure. The circumstances of such regulatory matters will change from time to time and actual results may vary significantly from the current estimate. For current matters not specifically reported below, management does not anticipate that the outcome from such matters would have a material effect on DESC’s financial position, liquidity or results of operations.

FERC

In June 2019, DESC submitted the 2015 Task Order as a stand-alone rate schedule, which governs DESC’s provision of retail service to the DOE at the Savannah River Site. The 2015 Task Order also includes provisions that govern the operations and maintenance of certain transmission facilities, which DESC had determined to be services that are likely subject to FERC’s jurisdiction. DESC requested that FERC accept the 2015 Task Order for filing to become effective in August 2019 and accept the refund analysis included in the filing for amounts collected under the 2015 Task Order as well as under two prior task orders commencing in 1995 and each covering ten-year periods. During the second quarter of 2019, DESC recorded a $6 million ($4 million after-tax) charge primarily within interest charges in DESC’s Consolidated Statements of Comprehensive Income (Loss). In August 2019, DESC submitted a motion to withdraw the 2015 Task Order filing and related refund analysis as requested by FERC staff. As a result, DESC recorded a $10 million ($7 million after-tax) benefit, primarily within interest charges in DESC’s Consolidated Statements of Comprehensive Income (Loss) during the third quarter of 2019, to remove previously recorded reserves.

Electric – BLRA

In July 2018, the South Carolina Commission issued orders implementing a legislatively-mandated temporary reduction in revenues that could be collected by DESC from customers under the BLRA. These orders reduced the portion of DESC’s retail electric rates associated with the NND Project from approximately 18% of the average residential electric customer's bill to approximately 3%,

which equates to a reduction in revenues of approximately $31 million per month, retroactive to April 1, 2018. As a result, in the second quarter of 2018 DESC recorded a charge of $109 million ($82 million after-tax) to operating revenues in DESC’s Consolidated Statements of Comprehensive Income (Loss). The temporary rate reduction remained in effect until February 2019 when rates pursuant to the SCANA Merger Approval Order became effective.

Other Regulatory Matters

Other than the following matter, there have been no significant developments regarding the pending regulatory matters disclosed in Note 2 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018 or Note 2 to the Consolidated Financial Statements in DESC’s Quarterly Report on Form 10-Q for the quarters ended March 31, 2019 and June 30, 2019.

Gas

In June 2019, DESC filed with the South Carolina Commission its monitoring report for the 12-month period ended March 31, 2019 with a total revenue requirement of $437 million. This represents a $7 million overall increase to its natural gas rates under the terms of the Natural Gas Rate Stabilization Act effective for the rate year beginning November 2019. In October 2019, the South Carolina Commission approved a total revenue requirement of $436 million effective with the first billing cycle of November 2019.

Regulatory Assets and Regulatory Liabilities

Rate-regulated utilities recognize in their financial statements certain revenues and expenses in different periods than do other enterprises. As a result, DESC has recorded regulatory assets and regulatory liabilities which are summarized in the following table. Except for NND Project costs and certain other unrecovered plant costs, substantially all regulatory assets are either explicitly excluded from rate base or are effectively excluded from rate base due to their being offset by related liabilities.

	September 30,		December 31,
(millions)	2019		2018
Regulatory assets:
NND Project costs	$	138	$	127
Income taxes recoverable through future rates		52		—
Deferred employee benefit plan costs		13		16
Other unrecovered plant		14		14
DSM programs		16		14
Other		89		53
Regulatory assets - current		322		224
NND Project costs		2,537		2,641
AROs		315		380
Cost of reacquired debt		271		14
Deferred employee benefit plan costs		205		256
Deferred losses on interest rate derivatives		310		442
Other unrecovered plant		70		79
DSM programs		53		51
Environmental remediation costs		21		24
Deferred storm damage costs		43		35
Deferred transmission operating costs		32		15
Other		113		123
Regulatory assets - noncurrent		3,970		4,060
Total regulatory assets	$	4,292	$	4,284
Regulatory liabilities:
Monetization of guaranty settlement	$	67	$	61
Income taxes refundable through future rates		—		52
Reserve for refunds to electric utility customers		215		—
Other		26		13
Regulatory liabilities - current		308		126
Monetization of guaranty settlement		987		1,037
Income taxes refundable through future rates		912		607
Asset removal costs		554		541
Deferred gains on interest rate derivatives		72		75
Reserve for refunds to electric utility customers		707		—
Other		9		4
Regulatory liabilities - noncurrent		3,241		2,264
Total regulatory liabilities	$	3,549	$	2,390

Regulatory assets have been recorded based on the probability of their recovery. All regulatory assets represent incurred costs that may be deferred under GAAP for regulated operations. The South Carolina Commission or the FERC has reviewed and approved through specific orders certain of the items shown as regulatory assets. In addition, regulatory assets include, but are not limited to, certain costs which have not been specifically approved for recovery by one of these regulatory agencies, including deferred transmission operating costs that are the subject of regulatory proceedings discussed in Note 11. While such costs are not currently being recovered, management believes they would be allowable under existing rate-making concepts embodied in rate orders or applicable state law and expects to recover these costs through rates in future periods. In the future, as a result of deregulation, changes in state law, other changes in the regulatory environment or changes in accounting requirements or other adverse legislative or regulatory developments, DESC could be required to write off all or a portion of its regulatory assets and liabilities. Such an event could have a material effect on DESC's Consolidated Financial Statements in the period the write-off would be recorded.

NND Project costs reflects expenditures associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from electric service customers over a 20-year period ending in 2039. See also Note 11.

AROs represent deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 106 years.

Employee benefit plan costs have historically been recovered as they have been recorded under GAAP.  Deferred employee benefit plan costs represent amounts of pension and other postretirement benefit costs which were accrued as liabilities and treated as regulatory assets pursuant to FERC guidance, and costs deferred pursuant to specific South Carolina Commission regulatory orders. DESC expects to recover deferred pension costs through utility rates over periods through 2044. DESC expects to recover other deferred benefit costs through utility rates, primarily over average service periods of participating employees up to 11 years.

Deferred losses or gains on interest rate derivatives represent (i) the changes in fair value and payments made or received upon settlement of certain interest rate derivatives designated as cash flow hedges and (ii) the changes in fair value and payments made or received upon settlement of certain other interest rate derivatives not so designated.  The amounts recorded with respect to (i) are expected to be amortized to interest expense over the lives of the underlying debt through 2043. The amounts recorded with respect to (ii) are expected to be similarly amortized to interest expense through 2065.

Other unrecovered plant represents the carrying value of coal-fired generating units, including related materials and supplies inventory, retired from service prior to being fully depreciated. DESC is amortizing these amounts through cost of service rates over the units' previous estimated remaining useful lives through 2025. Unamortized amounts are included in rate base and are earning a current return.

DSM programs represent deferred costs associated with electric demand reduction programs, and such deferred costs are currently being recovered over five years through an approved rate rider.

Environmental remediation costs are associated with the assessment and clean-up of sites currently or formerly owned by DESC. Such remediation costs are expected to be recovered over periods of up to 16 years. See also Note 11.

Deferred storm damage costs represent storm restoration costs for which DESC expects to receive future recovery through customer rates.

Deferred transmission operating costs includes deferred depreciation and property taxes associated with certain transmission assets for which DESC expects recovery from customers through future rates. See also Note 11.

Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be remaining life of the reacquired debt. The reacquired debt costs had a weighted-average life of approximately 26 years as of September 30, 2019.

Various other regulatory assets are expected to be recovered through rates over varying periods through 2047.

Monetization of guaranty settlement represents proceeds related to the monetization of the Toshiba Settlement. In accordance with the SCANA Merger Approval Order, this balance, net of amounts that may be required to satisfy certain liens, will be refunded to electric customers over a 20-year period ending in 2039. See also Note 11.

Income taxes recoverable/refundable through future rates includes (i) excess deferred income taxes arising from the remeasurement of deferred income taxes in connection with the enactment of the 2017 Tax Reform Act (certain of which are protected under normalization rules and will be amortized over the remaining lives of related property, and certain of which will be amortized to the benefit of customers over prescribed periods as instructed by regulators) and (ii) deferred income taxes arising from investment tax credits, offset by (iii) deferred income taxes that arise from utility operations that have not been included in customer rates (a portion of which relate to depreciation and are expected to be recovered over the remaining lives of the related property which may range up to 85 years). See also Note 6.

Reserve for refunds to electric utility customers reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited to customers over an estimated 11-year period in connection with the SCANA Merger Approval Order. See also Note 11.

Asset removal costs represent estimated net collections through depreciation rates of amounts to be expended for the removal of assets in the future. 

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Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

6. INCOME TAXES

DESC’s effective tax rate for the nine months ended September 30, 2019 is 5.7% compared to 21.1% for the nine months ended September 30, 2018. Variances in the effective tax rate are primarily driven by charges resulting from the SCANA Combination. In connection with the SCANA Merger Approval Order, Dominion Energy committed to forgo, or limit, the recovery of certain income tax-related regulatory assets associated with the NND Project. DESC's effective tax rate reflects income tax expense of $198 million in satisfaction of this commitment.

In the first quarter, DESC’s unrecognized tax benefits increased by $51 million and income tax expense increased by $40 million related to a state income tax position taken in prior years. In the second quarter, DESC’s unrecognized tax benefits increased by $24 million and income tax expense increased by $23 million primarily related to a federal income tax position taken in prior years. In the third quarter, DESC’s unrecognized tax benefits decreased by $5 million and income tax expense decreased by $4 million associated with refinements of estimates on a state income tax position taken in prior years.  In addition, DESC accrued interest and penalties of $12 million ($9 million after-tax) and $7 million ($7 million after-tax), respectively, on unrecognized tax benefits in the current quarter.

As of September 30, 2019, there have been no other material changes in DESC’s unrecognized tax benefits. See Note 6 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018 for a discussion of these unrecognized tax benefits and potential changes due to the SCANA Combination.

DESC has significant federal and state net operating loss carryforward-related deferred tax assets where the utilization of these tax benefits may be limited in future periods due to the SCANA Combination. For the period ended September 30, 2019, DESC has concluded a valuation allowance is not required on these deferred tax assets. If DESC concludes a valuation allowance is required in future periods, the impact could be material.

The 2017 Tax Reform Act limits the deductibility of interest expense to 30% of adjusted taxable income for certain businesses, with any disallowed interest carried forward indefinitely. Subject to additional guidance in yet to be finalized regulations, DESC expects its interest expense to be deductible in 2019.

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Fair Value Measurements, Including Derivatives (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total liabilities	$ 23	$ 11

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Employee Benefit Plans (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Expected pension contributions for remaining fiscal year					No
Voluntary retirement program related charges			$ 62
Voluntary retirement program related charges net of tax			47
Increase in pension benefit obligation		$ 25	16
Increase in accumulated postretirement benefit obligation			10
Increase in fair value of pension plan assets		35	27
Increase in net periodic benefit cost		4	$ 1
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement losses as a result of voluntary retirement program	[1]	$ 11		$ 0	$ 11	$ 0
Discount rate percentage		3.57%	4.07%		3.57%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement losses as a result of voluntary retirement program	[1]	$ 0		$ 0	$ 0	$ 0
Discount rate percentage			4.08%
Other Operations and Maintenance Expense
Defined Benefit Plan Disclosure [Line Items]
Voluntary retirement program related charges			$ 50
Other Taxes
Defined Benefit Plan Disclosure [Line Items]
Voluntary retirement program related charges			3
Other Income (Expense), Net
Defined Benefit Plan Disclosure [Line Items]
Voluntary retirement program related charges			$ 9
Settlement losses as a result of voluntary retirement program		$ 11

[1] Related to a voluntary retirement program.

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Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
DESS [Member]
Related Party Transaction [Line Items]
Capitalized expenditures	$ 13	$ 10	$ 33	$ 29

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Leases (Summary of Total Lease Cost) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Finance lease cost, amortization	$ 2	$ 6
Finance lease cost, interest	0	0
Operating lease cost	1	2
Short-term lease cost	0	1
Variable lease cost	0	0
Total lease cost	$ 3	$ 9

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Operating Segments (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Charge for refund of amounts from customers	$ 71	$ 73
Operating Segments
Segment Reporting Information [Line Items]
After- tax net expenses	1,400
Merger and integration related costs	90
Merger and integration-related costs, after tax	68
Charge related to a voluntary retirement program	75
Charge related to a voluntary retirement program, after-tax	56
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After- tax net expenses	1,400
Operating Segments | Electric Operations
Segment Reporting Information [Line Items]
Charge for refund of amounts from customers	1,000
Charge for refund of amounts from customers, after tax	756
Litigation settlement expense	266
Litigation settlement expense, after tax	200
Income tax related to regulatory assets acquired	264
Income tax related to regulatory assets acquired, after tax	198
Charge for utility plant but committed to forgo recovery	114
Charge for utility plant but committed to forgo recovery, after tax	86
Merger and integration-related costs, after tax	61
Changes in unrecognized tax benefits	59
Operating Segments | Gas Distribution
Segment Reporting Information [Line Items]
Merger and integration-related costs, after tax	$ 7

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Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail)	Sep. 30, 2019 USD ($)	[1]
Interest Rate Swap Current [Member]
Derivative [Line Items]
Interest rate	$ 0
Interest Rate Swap Noncurrent[Member]
Derivative [Line Items]
Interest rate	$ 71,400,000

[1] Maturity is determined based on final settlement period.

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Long-Term and Short-Term Debt and Liquidity (Schedule of Line of Credit Facilities) (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current Joint Revolving Credit Facility
Debt Instrument [Line Items]
Facility limit	$ 1,000,000,000
Outstanding Commercial Paper	0
Outstanding Letters of Credit	$ 0
Previous Joint Revolving Credit Facility
Debt Instrument [Line Items]
Facility limit		$ 1,200,000,000
Outstanding Commercial Paper		73,000,000
Outstanding Letters of Credit		$ 0

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Affiliated and Related Party Transactions

9 Months Ended

Sep. 30, 2019

Related Party Transactions [Abstract]

Affiliated and Related Party Transactions

14. AFFILIATED AND RELATED PARTY TRANSACTIONS

DESC owns 40% of Canadys Refined Coal, LLC, which is involved in the manufacturing and sale of refined coal to reduce emissions at certain of DESC's generating facilities. DESC accounts for this investment using the equity method. Purchases and sales of the related coal are recorded as other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss).

DESC purchases natural gas and related pipeline capacity from SCANA Energy Marketing, Inc. to serve its retail gas customers and to satisfy certain electric generation requirements. These purchases are included within gas purchased for resale or fuel used in electric generation, as applicable in the Consolidated Statements of Comprehensive Income (Loss).

DESS, on behalf of itself and its parent company, provides the following services to DESC, which are rendered at direct or allocated cost: information systems, telecommunications, customer support, marketing and sales, human resources, corporate compliance, purchasing, financial, risk management, public affairs, legal, investor relations, gas supply and capacity management, strategic planning, general administrative, and retirement benefits. In addition, DESS processes and pays invoices for DESC and is reimbursed. Costs for these services include amounts capitalized. Amounts expensed are primarily recorded in other operations and maintenance - affiliated suppliers and other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss).

	Three Months Ended September 30,				Nine Months Ended September 30,
(millions)	2019		2018		2019		2018
Purchases of coal from affiliate	$	38	$	45	$	100	$	123
Sales of coal to affiliate		37		45		99		122
Purchases of fuel used in electric generation from affiliate		—		35		43		95
Direct and allocated costs from services company affiliate(1)		67		73		207		208
Operating Revenues - Electric from sales to affiliate		1		1		3		3
Operating Expenses - Other taxes from affiliate		2		2		5		4

(1) ^{Includes capitalized expenditures of $13 million and $10 million for the three months ended September 30, 2019 and 2018, and $33 million and $29 million for the nine months ended September 30, 2019 and 2018, respectively.}

(millions)	September 30, 2019		December 31, 2018
Receivable from Canadys Refined Coal, LLC	$	13	$	7
Payable to Canadys Refined Coal, LLC		13		7
Payable to SCANA Energy Marketing, Inc.		—		14
Payable to DESS		47		38

In connection with the SCANA Combination, purchases from certain entities owned by Dominion Energy became affiliated transactions. During the three and nine months ended September 30, 2019, DESC purchased electricity generated by three such affiliates, totaling $3 million and $7 million, respectively, which is recorded as purchased power in the Consolidated Statements of Comprehensive Income (Loss). At September 30, 2019, DESC had accounts payable balances to these affiliates totaling less than $1 million. In addition, during the three and nine months ended September 30, 2019, DESC incurred demand and transportation charges from Dominion Energy Carolina Gas Transmission, LLC totaling $16 million and $48 million, respectively, of which $6 million and $15 million, respectively, is recorded as fuel used in electric generation and $10 million and $33 million, respectively, is recorded as gas purchased for resale in the Consolidated Statements of Comprehensive Income (Loss). At September 30, 2019, DESC had an accounts payable balance due to this affiliate totaling $6 million.

Borrowings from an affiliate are described in Note 5.

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Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2019

Revenue Recognition And Deferred Revenue [Abstract]

Disaggregation of Revenue

DESC has disaggregated operating revenues by customer class as follows:

	Three Months Ended				Three Months Ended				Nine Months Ended				Nine Months Ended
	September 30, 2019				September 30, 2018				September 30, 2019				September 30, 2018
(millions)	Electric		Gas		Electric		Gas		Electric		Gas		Electric		Gas
Customer class:
Residential	$	354	$	24	$	310	$	25	$	364	$	133	$	805	$	145
Commercial		229		19		231		19		296		80		571		80
Industrial		101		18		95		19		119		63		286		64
Other		37		6		31		6		82		13		99		13
Revenues from contracts with    customers		721		67		667		69		861		289		1,761		302
Other revenues		7		—		3		—		8		—		9		1
Total Operating Revenues	$	728	$	67	$	670	$	69	$	869	$	289	$	1,770	$	303

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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Allowance for borrowed funds used during construction	$ 2	$ 2	$ 4	$ 7
Deferred cost of employee benefit plans, tax	$ 0	$ 0	$ 0	$ 0

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Dominion Energy South Carolina, Inc.
Entity Central Index Key	0000091882
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		40,296,147
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-3375
Entity Tax Identification Number	57-0248695
Entity Address, Address Line One	400 Otarre Parkway
Entity Address, City or Town	Cayce
Entity Address, State or Province	SC
Entity Address, Postal Zip Code	29033
City Area Code	803
Local Phone Number	217-9000
Entity Incorporation, State or Country Code	SC
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Consolidation and Variable Interest Entities

DESC has determined that it has a controlling financial interest in each of GENCO and Fuel Company (which are considered to be VIEs) and, accordingly, DESC's Consolidated Financial Statements include, after eliminating intercompany balances and transactions, the accounts of DESC, GENCO and Fuel Company. The equity interests in GENCO and Fuel Company are held solely by SCANA, DESC’s parent. As a result, GENCO and Fuel Company’s equity and results of operations are reflected as noncontrolling interest in the Consolidated Financial Statements.

GENCO owns a coal-fired electric generating station with a 605 MW net generating capacity (summer rating). GENCO’s electricity is sold, pursuant to a FERC-approved tariff, solely to DESC under the terms of a power purchase agreement and related operating agreement. The effects of these transactions are eliminated in consolidation. GENCO’s property (carrying value of $501 million) previously served as collateral for its long-term borrowings. In May 2019, GENCO redeemed its 5.49% senior secured notes and was able to release the first mortgage lien in June 2019 that had previously secured these notes. Fuel Company acquires, owns and provides financing for DESC’s nuclear fuel, certain fossil fuels and emission and other environmental allowances. See also Note 5.

Additionally, DESC purchases shared services from DESS, an affiliated VIE that provides accounting, legal, finance and certain administrative and technical services to all SCANA subsidiaries, including DESC. DESC has determined that it is not the primary beneficiary of DESS as it does not have either the power to direct the activities that most significantly impact its economic performance or an obligation to absorb losses and benefits which could be significant to it. See Note 14 for amounts attributable to affiliates.

Significant Accounting Policies

There have been no significant changes from Note 1 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018, with the exception of the item described below.

Leases

DESC leases certain assets including vehicles, real estate, office equipment and other assets under both operating and finance leases. For operating leases, rent expense is recognized on a straight-line basis over the term of the lease agreement, subject to regulatory framework. Rent expense associated with operating leases, short-term leases and variable leases is primarily recorded in other operations and maintenance expense in the Consolidated Statements of Comprehensive Income (Loss). Rent expense associated with finance leases results in the separate presentation of interest expense on the lease liability and amortization expense of the related right-of-use asset in the Consolidated Statements of Comprehensive Income (Loss). Amortization expense and interest charges associated with finance leases are recorded in depreciation and amortization and interest charges, respectively, in the Consolidated Statements of Comprehensive Income (Loss) or deferred within regulatory assets in the Consolidated Balance Sheets.

Certain leases include one or more options to renew, with renewal terms that can extend the lease from one to 70 years. The exercise of renewal options is solely at DESC's discretion and is included in the lease term if the option is reasonably certain to be exercised. A right-of-use asset and corresponding lease liability for leases with original lease terms of one year or less are not included in the Consolidated Balance Sheets, unless such leases contain renewal options that DESC is reasonably certain will be exercised.

The determination of the discount rate utilized has a significant impact on the calculation of the present value of the lease liability included in the Consolidated Balance Sheets. For DESC’s leased assets, the discount rate implicit in the lease is generally unable to be determined from a lessee perspective.  As such, DESC uses internally-developed incremental borrowing rates as a discount rate in the calculation of the present value of the lease liability. The incremental borrowing rates are determined based on an analysis of DESC's publicly available secured borrowing rates over various lengths of time that most closely correspond to DESC's lease maturities.

Recently Adopted Accounting Standards

In February 2016, the Financial Accounting Standards Board issued revised accounting guidance for the recognition, measurement, presentation and disclosure of leasing arrangements. The update requires that a liability and corresponding right-of-use asset are recorded on the balance sheet for all leases, including those leases classified as operating leases, while also refining the definition of a lease. In addition, lessees will be required to disclose key information about the amount, timing, and uncertainty of cash flows arising from leasing arrangements. Lessor accounting remains largely unchanged.

The guidance became effective for DESC's interim and annual reporting periods beginning January 1, 2019. DESC adopted this revised accounting guidance using a modified retrospective approach, which requires lessees and lessors to recognize and measure leases at the date of adoption. Under this approach, DESC utilized the transition practical expedient to maintain historical presentation for periods before January 1, 2019. DESC also applied the other practical expedients, which required no reassessment of whether existing contracts are or contain leases, no reassessment of lease classification for existing leases and no evaluation of existing or expired land easements that were not previously accounted for as leases. In connection with the adoption of this revised accounting guidance, DESC recorded $19 million of offsetting right-of-use assets and liabilities for operating leases in effect at the adoption date. See Note 12 for additional information.

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Equity

9 Months Ended

Sep. 30, 2019

Stockholders Equity Note [Abstract]

Equity

4. EQUITY

For all periods presented, DESC's authorized shares of common stock, no par value, were 50 million, of which 40.3 million were issued and outstanding, and DESC's authorized shares of preferred stock, no par value, were 20 million, of which 1,000 shares were issued and outstanding. All outstanding shares of common and preferred stock are held by SCANA.

In February 2019, DESC received an equity contribution of $675 million from its parent that was funded by Dominion Energy. DESC used these funds to redeem long-term debt. See Note 5.

In June 2019, DESC received an equity contribution of $100 million from its parent that was funded by Dominion Energy. DESC used these funds to repay intercompany credit agreement borrowings from Dominion Energy.

In September 2019, DESC received an equity contribution of $50 million from its parent that was funded by Dominion Energy. DESC used these funds to redeem long-term debt. See Note 5.

DESC’s bond indenture under which it issues first mortgage bonds contains provisions that could limit the payment of cash dividends on its common stock. DESC's bond indenture permits the payment of dividends on DESC's common stock only either (1) out of its Surplus (as defined in the bond indenture) or (2) in case there is no Surplus, out of its net profits for the fiscal year in which the dividend is declared and/or the preceding fiscal year. In addition, the Federal Power Act requires the appropriation of a portion of certain earnings from hydroelectric projects. At both September 30, 2019 and December 31, 2018, retained earnings of $115 million were restricted by this requirement as to payment of cash dividends on DESC’s common stock. In addition, pursuant to the SCANA Merger Approval Order, the amount of any DESC dividends paid must be reasonable and consistent with the long-term payout ratio of the electric utility industry and gas distribution industry.

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Fair Value Measurements, Including Derivatives

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements, Including Derivatives

8. FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. Fair values are based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations. This includes not only the credit standing of counterparties involved and the impact of credit enhancements but also the impact of DESC’s own nonperformance risk on their liabilities. Fair value measurements assume that the transaction occurs in the principal market for the asset or liability (the market with the most volume and activity for the asset or liability from the perspective of the reporting entity), or in the absence of a principal market, the most advantageous market for the asset or liability (the market in which the reporting entity would be able to maximize the amount received or minimize the amount paid). DESC applies fair value measurements to interest rate assets and liabilities. DESC’s interest rate swap agreements are valued using discounted cash flow models with independently sourced data. DESC applies credit adjustments to its derivative fair values in accordance with the requirements described above.

Inputs and Assumptions

Fair value is based on actively-quoted market prices, if available. In the absence of actively-quoted market prices, price information is sought from external sources, including industry publications, and to a lesser extent, broker quotes. When evaluating pricing information, DESC considers the ability to transact at the quoted price. Periodically, inputs to valuation models are reviewed and revised as needed, based on historical information, updated market data, market liquidity and relationships, and changes in third-party sources.

The inputs and assumptions used in measuring fair value for interest rate derivative contracts include the following:

• Interest rate curves

• Credit quality of counterparties and DESC

• Notional value

• Credit enhancements

• Time value

Levels

DESC utilizes the following fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels:

• Level 1-Quoted prices (unadjusted) in active markets for identical assets and liabilities that they have the ability to access at the measurement date.  

• Level 2-Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived from observable market data by correlation or other means. Instruments categorized in Level 2 include interest rate swaps.

• Level 3-Unobservable inputs for the asset or liability, including situations where there is little, if any, market activity for the asset or liability.

The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. In these cases, the lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability.

Recurring Fair Value Measurements

Fair value measurements are separately disclosed by level within the fair value hierarchy.

All of DESC's interest rate swap agreements were in a liability position for all periods presented. Such agreements are valued using discounted cash flow models with independently sourced data, and are considered to be Level 2 fair value measurements. The fair value of these derivatives at September 30, 2019 was $23 million, and at December 31, 2018 was $11 million.

Fair Value of Financial Instruments

Substantially all of DESC’s financial instruments are recorded at fair value, with the exception of the instruments described below, which are reported at historical cost. Estimated fair values have been determined using available market information and valuation methodologies considered appropriate by management. The carrying amount of financial instruments classified within current assets and current liabilities are representative of fair value because of the short-term nature of these instruments. For financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows:

	September 30, 2019				December 31, 2018
(millions)	Carrying Amount		Estimated Fair Value(1)		Carrying Amount		Estimated Fair Value(2)
Long-term debt(3)	$	3,615	$	4,601	$	5,146	$	5,470

(1) Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

(2) Fair value is estimated based on net present value calculations using independently sourced market data that incorporate a developed discount rate using similarly rated long-term debt, along with benchmark interest rates. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

(3) Carrying amount includes amounts which represent the unamortized debt issuance costs and discount or premium.

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Revenue Recognition (Disaggregation of Revenue) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating revenue from contracts with customers	$ 1	$ 1	$ 4	$ 4
Total operating revenues	795	739	1,158	2,074
Electric Operations
Operating revenue from contracts with customers	721	667	861	1,761
Other revenues	7	3	8	9
Total operating revenues	728	670	869	1,770
Gas Distribution
Operating revenue from contracts with customers	67	69	289	302
Other revenues	0	0	0	1
Total operating revenues	67	69	289	303
Residential | Electric Operations
Operating revenue from contracts with customers	354	310	364	805
Residential | Gas Distribution
Operating revenue from contracts with customers	24	25	133	145
Commercial | Electric Operations
Operating revenue from contracts with customers	229	231	296	571
Commercial | Gas Distribution
Operating revenue from contracts with customers	19	19	80	80
Industrial | Electric Operations
Operating revenue from contracts with customers	101	95	119	286
Industrial | Gas Distribution
Operating revenue from contracts with customers	18	19	63	64
Other | Electric Operations
Operating revenue from contracts with customers	37	31	82	99
Other | Gas Distribution
Operating revenue from contracts with customers	$ 6	$ 6	$ 13	$ 13

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Summary of Significant Accounting Policies (Narrative) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) MW		May 31, 2019	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Carrying value of property	$ 71				$ 72
Option to extend, existence, operating lease	true
Operating lease, right of use asset	$ 24	[1]		$ 19
Operating lease liability	$ 22			$ 19
Minimum [Member]
Power Generation Capacity Megawatts | MW	25
Lease renewal term	1 year
Maximum [Member]
Lease renewal term	70 years
Genco
Power Generation Capacity Megawatts | MW	605
Carrying value of property	$ 501
Genco | 5.49% Senior Secured Note Due 2024
Debt instrument, interest rate			5.49%

[1] Included in other deferred debits and other assets in the Consolidated Balance Sheets.

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Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Schedule Of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets

At September 30, 2019, DESC had the following lease assets and liabilities recorded in the Consolidated Balance Sheets:

(millions)	September 30, 2019
Lease assets:
Operating lease assets(1)	$	24
Finance lease assets(2)		27
Total lease assets	$	51
Lease liabilities:
Operating lease - current(3)	$	3
Operating lease - noncurrent(4)		19
Finance lease - current(5)		7
Finance lease - noncurrent(6)		21
Total lease liabilities	$	50

(1) Included in other deferred debits and other assets in the Consolidated Balance Sheets.

(2) ^{Included in utility plant, net, in the Consolidated Balance Sheets, net of $22 million of accumulated amortization at September 30, 2019.}

(3) ^{Included in other current liabilities in the Consolidated Balance Sheets.}

(4) ^{Included in other deferred credits and other liabilities in the Consolidated Balance Sheets.}

(5) ^{Included in current portion of long-term debt in the Consolidated Balance Sheets.}

(6) ^{Included in long-term debt in the Consolidated Balance Sheets.}

Summary of Total Lease Cost

For the three and nine months ended September 30, 2019, total lease cost consisted of the following:

	Three Months Ended		Nine Months Ended
(millions)	September 30, 2019		September 30, 2019
Finance lease cost:
Amortization	$	2	$	6
Interest		—		—
Operating lease cost		1		2
Short-term lease cost		—		1
Variable lease cost		—		—
Total lease cost	$	3	$	9

Cash Paid for Amounts Included in Measurement of Lease Liabilities

For the nine months ended September 30, 2019, cash paid for amounts included in the measurement of lease liabilities consisted of the following amounts, included in the Consolidated Statements of Cash Flows:

	Nine Months Ended
(millions)	September 30, 2019
Operating cash flows from finance leases	$	1
Operating cash flows from operating leases		3
Financing cash flows from finance leases		5

Summary of Weighted Average Remaining Lease Term And Discount Rate for Operating and Finance Leases

At September 30, 2019, the weighted average remaining lease term and weighted average discount rate for finance and operating leases were as follows:

	September 30, 2019
Weighted average remaining lease term - finance leases	5 years
Weighted average remaining lease term - operating leases	18 years
Weighted average discount rate - finance leases		2.96	%
Weighted average discount rate - operating leases		3.95	%

Schedule of Maturity Analysis of Operating and Finance Lease Liabilities

Lease liabilities have the following scheduled maturities:

(millions)	Operating			Finance
2019	$	1		$	2
2020		4			8
2021		3			6
2022		2			5
2023		1			3
After 2023		23			6
Total undiscounted lease payments		34			30
Present value adjustment		(12	)		(2	)
Present value of lease liabilities	$	22		$	28

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Derivative Financial Instruments (Derivatives Not Designated as Hedging Instruments) (Detail) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[1]	$ (2)	$ 1	$ (5)	$ 66
Amount of gain (loss) recognized in income on derivatives	[2]	(1)	(1)	(1)	113
Other Income [Member]
Derivative [Line Items]
Amount of gain (loss) recognized in income on derivatives	[2]			0	115
Interest Rate Contract [Member] | Interest Charges [Member]
Derivative [Line Items]
Amount of gain (loss) recognized in income on derivatives	[2]	$ (1)	$ (1)	$ (1)	$ (2)

[1] Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

[2] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

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Utility Plant and Nonutility Property (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
	Aug. 31, 2019	May 31, 2019	Sep. 30, 2019
Summer
Utility Plant And Non Utility Property [Line Items]
Percentage of direct expenses			66.70%
Percentage of ownership interest		66.70%
NND Project | Summer
Utility Plant And Non Utility Property [Line Items]
Percentage of ownership interest		55.00%
Santee Cooper | NND Project | Summer
Utility Plant And Non Utility Property [Line Items]
Percentage of ownership interest		11.70%
Ownership interest purchased		$ 8
Warranty Service Contract Assets
Utility Plant And Non Utility Property [Line Items]
Total consideration from sale of assets		$ 7
Contractual term of agreement to use brand			10 years
Warranty Service Contract Assets | Other Income (Expense), Net
Utility Plant And Non Utility Property [Line Items]
Gain on sale of assets	$ 7
Gain on sale of assets, after tax	$ 5

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Leases (Schedule Of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions		Sep. 30, 2019		Jan. 01, 2019
Leases [Abstract]
Operating lease assets		$ 24	[1]	$ 19
Finance lease assets	[2]	27
Total lease assets		51
Operating lease liabilities - current	[3]	3
Operating lease liabilities - noncurrent	[4]	19
Finance lease liabilities - current	[5]	7
Finance lease liabilities - noncurrent	[6]	21
Total lease liabilities		$ 50

[1] Included in other deferred debits and other assets in the Consolidated Balance Sheets.

[2] Included in utility plant, net, in the Consolidated Balance Sheets, net of $22 million of accumulated amortization at September 30, 2019.

[3] Included in other current liabilities in the Consolidated Balance Sheets.

[4] Included in other deferred credits and other liabilities in the Consolidated Balance Sheets.

[5] Included in current portion of long-term debt in the Consolidated Balance Sheets.

[6] Included in long-term debt in the Consolidated Balance Sheets.

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Derivative Financial Instruments (Derivatives in Cash Flow Hedging Relationships) (Detail) - Cash Flow Hedging [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Gain (loss) Reclassified from Deferred Accounts into Income		$ 0	$ 0	$ 0	$ (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[1]	(1)	0	(3)	2
Interest Rate Contract [Member]
Derivative [Line Items]
Gain (loss) Reclassified from Deferred Accounts into Income	[2]	0	0	0	(1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[1],[2]	$ (1)	$ 0	$ (3)	$ 2

[1] Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/ liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

[2] Amounts recorded in DESC’s Consolidated Statements of Comprehensive Income (Loss) are classified in interest charges.

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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Taxes [Line Items]
Effective tax rate, percent					5.70%	21.10%
Effective tax rate, state and local income taxes, amount					$ 198
Income tax expense	$ 40			$ 29	$ (63)	$ 70
Percentage of deductibility of interest expense					30.00%
Prior Years
Income Taxes [Line Items]
Accrued interest	12				$ 12
Accrued interest after tax	9				9
Accrued penalties	7				7
Accrued penalties after tax	7				$ 7
Prior Years | State
Income Taxes [Line Items]
Unrecognized tax benefits increase (decrease)	(5)		$ 51
Income tax expense	$ (4)		$ 40
Prior Years | Federal
Income Taxes [Line Items]
Unrecognized tax benefits increase (decrease)		$ 24
Income tax expense		$ 23

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Equity (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Feb. 28, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Stockholders Equity Note [Abstract]
Common stock, par value	$ 0			$ 0
Common stock, shares authorized	50,000,000			50,000,000
Common stock, shares issued	40,300,000			40,300,000
Common stock, shares outstanding	40,300,000			40,300,000		40,300,000
Preferred stock, par value	$ 0			$ 0
Preferred stock, shares authorized	20,000,000			20,000,000
Preferred stock, shares issued	1,000			1,000
Preferred stock, shares outstanding	1,000			1,000
Contributions from parent	$ 50	$ 100	$ 675	$ 825	$ 20
Retained earnings, restricted	$ 115			$ 115		$ 115

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Leases (Summary of Weighted Average Remaining Lease Term And Discount Rate for Operating and Finance Leases) (Detail)	Sep. 30, 2019
Leases [Abstract]
Weighted average remaining lease term - finance leases	5 years
Weighted average remaining lease term - operating leases	18 years
Weighted average discount rate - finance leases	2.96%
Weighted average discount rate - operating leases	3.95%

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Affiliated and Related Party Transactions (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Purchases from affiliates, fuel used in electric generation	$ 0	$ 35	$ 43	$ 95
Canadys Refined Coal [Member]
Related Party Transaction [Line Items]
Ownership percentage	40.00%		40.00%
Purchases from affiliates	$ 38	$ 45	$ 100	$ 123
Accounts payable to affiliates	13		13		$ 7
Solar Affiliates [Member]
Related Party Transaction [Line Items]
Purchases from affiliates	3		7
Solar Affiliates [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Accounts payable to affiliates	1		1
Dominion Energy Carolina Gas Transmission LLC [Member]
Related Party Transaction [Line Items]
Purchases from affiliates	16		48
Accounts payable to affiliates	6		6
Purchases from affiliates, fuel used in electric generation	6		15
Purchases from affiliates, gas purchased for resale	$ 10		$ 33

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Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Statement Of Cash Flows [Abstract]
Restricted cash and equivalents	$ 0	$ 0	$ 0	$ 0
Financing leases	3
Operating leases	$ 4
Capital leases		$ 7

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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Utility plant, net	$ 8,751	$ 8,783
Receivables, customer, allowance for uncollectible accounts	8	4
Total current assets	1,163	1,689
Total deferred debits and other assets	$ 4,125	$ 4,228
Common Stock, Par Value	$ 0	$ 0
Common Stock, Shares, Outstanding	40.3	40.3
Variable Interest Entity, Primary Beneficiary [Member]
Utility plant, net	$ 683	$ 711
Total current assets	134	96
Total deferred debits and other assets	$ 34	$ 34

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Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

12. LEASES

At September 30, 2019, DESC had the following lease assets and liabilities recorded in the Consolidated Balance Sheets:

(millions)	September 30, 2019
Lease assets:
Operating lease assets(1)	$	24
Finance lease assets(2)		27
Total lease assets	$	51
Lease liabilities:
Operating lease - current(3)	$	3
Operating lease - noncurrent(4)		19
Finance lease - current(5)		7
Finance lease - noncurrent(6)		21
Total lease liabilities	$	50

(1) Included in other deferred debits and other assets in the Consolidated Balance Sheets.

(2) ^{Included in utility plant, net, in the Consolidated Balance Sheets, net of $22 million of accumulated amortization at September 30, 2019.}

(3) ^{Included in other current liabilities in the Consolidated Balance Sheets.}

(4) ^{Included in other deferred credits and other liabilities in the Consolidated Balance Sheets.}

(5) ^{Included in current portion of long-term debt in the Consolidated Balance Sheets.}

(6) ^{Included in long-term debt in the Consolidated Balance Sheets.}

For the three and nine months ended September 30, 2019, total lease cost consisted of the following:

	Three Months Ended		Nine Months Ended
(millions)	September 30, 2019		September 30, 2019
Finance lease cost:
Amortization	$	2	$	6
Interest		—		—
Operating lease cost		1		2
Short-term lease cost		—		1
Variable lease cost		—		—
Total lease cost	$	3	$	9

For the nine months ended September 30, 2019, cash paid for amounts included in the measurement of lease liabilities consisted of the following amounts, included in the Consolidated Statements of Cash Flows:

	Nine Months Ended
(millions)	September 30, 2019
Operating cash flows from finance leases	$	1
Operating cash flows from operating leases		3
Financing cash flows from finance leases		5

At September 30, 2019, the weighted average remaining lease term and weighted average discount rate for finance and operating leases were as follows:

	September 30, 2019
Weighted average remaining lease term - finance leases	5 years
Weighted average remaining lease term - operating leases	18 years
Weighted average discount rate - finance leases		2.96	%
Weighted average discount rate - operating leases		3.95	%

Lease liabilities have the following scheduled maturities:

(millions)	Operating			Finance
2019	$	1		$	2
2020		4			8
2021		3			6
2022		2			5
2023		1			3
After 2023		23			6
Total undiscounted lease payments		34			30
Present value adjustment		(12	)		(2	)
Present value of lease liabilities	$	22		$	28

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Consolidation and Variable Interest Entities

Basis of Consolidation and Variable Interest Entities

DESC has determined that it has a controlling financial interest in each of GENCO and Fuel Company (which are considered to be VIEs) and, accordingly, DESC's Consolidated Financial Statements include, after eliminating intercompany balances and transactions, the accounts of DESC, GENCO and Fuel Company. The equity interests in GENCO and Fuel Company are held solely by SCANA, DESC’s parent. As a result, GENCO and Fuel Company’s equity and results of operations are reflected as noncontrolling interest in the Consolidated Financial Statements.

GENCO owns a coal-fired electric generating station with a 605 MW net generating capacity (summer rating). GENCO’s electricity is sold, pursuant to a FERC-approved tariff, solely to DESC under the terms of a power purchase agreement and related operating agreement. The effects of these transactions are eliminated in consolidation. GENCO’s property (carrying value of $501 million) previously served as collateral for its long-term borrowings. In May 2019, GENCO redeemed its 5.49% senior secured notes and was able to release the first mortgage lien in June 2019 that had previously secured these notes. Fuel Company acquires, owns and provides financing for DESC’s nuclear fuel, certain fossil fuels and emission and other environmental allowances. See also Note 5.

Additionally, DESC purchases shared services from DESS, an affiliated VIE that provides accounting, legal, finance and certain administrative and technical services to all SCANA subsidiaries, including DESC. DESC has determined that it is not the primary beneficiary of DESS as it does not have either the power to direct the activities that most significantly impact its economic performance or an obligation to absorb losses and benefits which could be significant to it. See Note 14 for amounts attributable to affiliates.

Significant Accounting Policies

There have been no significant changes from Note 1 to the Consolidated Financial Statements in DESC's Annual Report on Form 10-K for the year ended December 31, 2018, with the exception of the item described below.

Leases

Leases

DESC leases certain assets including vehicles, real estate, office equipment and other assets under both operating and finance leases. For operating leases, rent expense is recognized on a straight-line basis over the term of the lease agreement, subject to regulatory framework. Rent expense associated with operating leases, short-term leases and variable leases is primarily recorded in other operations and maintenance expense in the Consolidated Statements of Comprehensive Income (Loss). Rent expense associated with finance leases results in the separate presentation of interest expense on the lease liability and amortization expense of the related right-of-use asset in the Consolidated Statements of Comprehensive Income (Loss). Amortization expense and interest charges associated with finance leases are recorded in depreciation and amortization and interest charges, respectively, in the Consolidated Statements of Comprehensive Income (Loss) or deferred within regulatory assets in the Consolidated Balance Sheets.

Certain leases include one or more options to renew, with renewal terms that can extend the lease from one to 70 years. The exercise of renewal options is solely at DESC's discretion and is included in the lease term if the option is reasonably certain to be exercised. A right-of-use asset and corresponding lease liability for leases with original lease terms of one year or less are not included in the Consolidated Balance Sheets, unless such leases contain renewal options that DESC is reasonably certain will be exercised.

The determination of the discount rate utilized has a significant impact on the calculation of the present value of the lease liability included in the Consolidated Balance Sheets. For DESC’s leased assets, the discount rate implicit in the lease is generally unable to be determined from a lessee perspective.  As such, DESC uses internally-developed incremental borrowing rates as a discount rate in the calculation of the present value of the lease liability. The incremental borrowing rates are determined based on an analysis of DESC's publicly available secured borrowing rates over various lengths of time that most closely correspond to DESC's lease maturities.

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards

In February 2016, the Financial Accounting Standards Board issued revised accounting guidance for the recognition, measurement, presentation and disclosure of leasing arrangements. The update requires that a liability and corresponding right-of-use asset are recorded on the balance sheet for all leases, including those leases classified as operating leases, while also refining the definition of a lease. In addition, lessees will be required to disclose key information about the amount, timing, and uncertainty of cash flows arising from leasing arrangements. Lessor accounting remains largely unchanged.

The guidance became effective for DESC's interim and annual reporting periods beginning January 1, 2019. DESC adopted this revised accounting guidance using a modified retrospective approach, which requires lessees and lessors to recognize and measure leases at the date of adoption. Under this approach, DESC utilized the transition practical expedient to maintain historical presentation for periods before January 1, 2019. DESC also applied the other practical expedients, which required no reassessment of whether existing contracts are or contain leases, no reassessment of lease classification for existing leases and no evaluation of existing or expired land easements that were not previously accounted for as leases. In connection with the adoption of this revised accounting guidance, DESC recorded $19 million of offsetting right-of-use assets and liabilities for operating leases in effect at the adoption date. See Note 12 for additional information.

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Offsetting Liabilities

The table below presents derivative balances by type of financial instrument, if the gross amounts recognized in the Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid:

	September 30, 2019								December 31, 2018
	Gross Amounts Not Offset in the Consolidated Balance Sheet								Gross Amounts Not Offset in the Consolidated Balance Sheet
(millions)	Gross Liabilities Presented in the Consolidated Balance Sheet		Financial Instruments		Cash Collateral Paid		Net Amounts		Gross Liabilities Presented in the Consolidated Balance Sheet		Financial Instruments		Cash Collateral Paid		Net Amounts
Interest rate contracts:
Over-the-counter	$	23	$	—	$	23	$	—	$	11	$	—	$	11	$	—
Total derivatives	$	23	$	—	$	23	$	—	$	11	$	—	$	11	$	—

Schedule of Volume of Derivative Activity

The following table presents the volume of derivative activity at September 30, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions.

	Current		Noncurrent
Interest rate(1)	$	—	$	71,400,000

(1) ^{Maturity is determined based on final settlement period.}

Fair Value of Derivatives

The following tables present the fair values of derivatives and where they are presented in the Consolidated Balance Sheets:

(millions)	Fair Value - Derivatives under Hedge Accounting		Fair Value - Derivatives not under Hedge Accounting		Total Fair Value
At September 30, 2019
Current Liabilities
Interest rate	$	1	$	1	$	2
Total current derivative liabilities(1)		1		1		2
Noncurrent Liabilities
Interest rate		13		8		21
Total noncurrent derivative liabilities(2)		13		8		21
Total derivative liabilities	$	14	$	9	$	23
At December 31, 2018
Current Liabilities
Interest rate	$	1	$	—	$	1
Total current derivative liabilities(1)		1		—		1
Noncurrent Liabilities
Interest rate		7		3		10
Total noncurrent derivative liabilities(2)		7		3		10
Total derivative liabilities	$	8	$	3	$	11

(1) Current derivative liabilities are presented in other current liabilities in the Consolidated Balance Sheets.

(2) ^{Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Consolidated Balance Sheets.}

Derivatives in Cash Flow Hedging Relationships

The following tables present the gains and losses on derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Comprehensive Income (Loss):

Derivatives in Cash Flow Hedging Relationships

(millions)	Gain (loss) Reclassified from Deferred Accounts into Income			Increase (Decrease) in Derivatives Subject to Regulatory Treatment(1)
Three Months Ended September 30, 2019
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	(1	)
Total	$	—		$	(1	)
Three Months Ended September 30, 2018
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	—
Total	$	—		$	—
Nine Months Ended September 30, 2019
Derivative type and location of gains (losses):
Interest rate(2)	$	—		$	(3	)
Total	$	—		$	(3	)
Nine Months Ended September 30, 2018
Derivative type and location of gains (losses):
Interest rate(2)	$	(1	)	$	2
Total	$	(1	)	$	2

(1) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/ liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

(2) Amounts recorded in DESC’s Consolidated Statements of Comprehensive Income (Loss) are classified in interest charges.

Derivatives Not Designated as Hedging Instruments

(millions)	Increase (Decrease) in Derivatives Subject to Regulatory Treatment(1)						Amount of Gain (Loss) Recognized in Income on Derivatives(2)
Three Months Ended September 30,	2019			2018		Location	2019			2018
Derivative type and location of gains (losses):
Interest rate contracts:						Interest charges	$	(1	)	$	(1	)
Total interest rate contracts	$	(2	)	$	1		$	(1	)	$	(1	)
Nine Months Ended September 30,
Derivative type and location of gains (losses):
Interest rate contracts:						Interest charges	$	(1	)	$	(2	)
						Other income		—			115
Total interest rate contracts	$	(5	)	$	66		$	(1	)	$	113

(1) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).

(2) ^{Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Consolidated Statements of Comprehensive Income (Loss).}

Derivative Contracts with Credit Contingent Features

Derivative Contracts with Credit Contingent Features

(millions)	September 30, 2019		December 31, 2018
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	23	$	11
Fair value of collateral already posted		23		11
Additional cash collateral or letters of credit in the event credit-risk-related    contingent features were triggered	$	—	$	—

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Long-Term and Short-Term Debt and Liquidity (Schedule of Line of Credit Facilities) (Parenthetical) (Detail)	Dec. 31, 2018 USD ($)
Fuel Company
Debt Instrument [Line Items]
Facility limit	$ 500,000,000

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Revenue Recognition (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Contract liability balances	$ 5	$ 4
Revenue recognized from contract liability balances	$ 3

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Derivative Financial Instruments (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Liability		$ 23	$ 11
Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[1]	2	1
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[2]	21	10
Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability		2	1
Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability		21	10
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability		14	8
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[1]	1	1
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[2]	13	7
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability		1	1
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability		13	7
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability		9	3
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[1]	1	0
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[2]	8	3
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability		1	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability		$ 8	$ 3

[1] Current derivative liabilities are presented in other current liabilities in the Consolidated Balance Sheets.

[2] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Consolidated Balance Sheets.

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Leases (Schedule of Maturity Analysis of Operating and Finance Lease Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019
Operating Lease Liabilities, Payments Due [Abstract]
Maturity of operating lease liabilities, 2019	$ 1
Maturity of operating lease liabilities, 2020	4
Maturity of operating lease liabilities, 2021	3
Maturity of operating lease liabilities, 2022	2
Maturity of operating lease liabilities, 2023	1
Maturity of operating lease liabilities, after 2023	23
Maturity of operating lease liabilities, total undiscounted lease payments	34
Operating lease liabilities, present value adjustment	(12)
Present value of operating lease liabilities	22	$ 19
Finance Lease Liabilities, Payments, Due [Abstract]
Maturity of finance lease liabilities, 2019	2
Maturity of finance lease liabilities, 2020	8
Maturity of finance lease liabilities, 2021	6
Maturity of finance lease liabilities, 2022	5
Maturity of finance lease liabilities, 2023	3
Maturity of finance lease liabilities, after 2023	6
Maturity of finance lease liabilities, total undiscounted lease payments	30
Finance lease liabilities, present value adjustment	(2)
Present value of finance lease liabilities	$ 28

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Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Related Party Transaction [Line Items]
Purchases of fuel used in electric generation from affiliate		$ 0	$ 35	$ 43	$ 95
Operating Revenues - Electric from sales to affiliate		1	1	3	3
Operating Expenses - Other taxes from affiliate		2	2	5	4
DESS [Member]
Related Party Transaction [Line Items]
Direct and allocated costs from services company affiliate	[1]	67	73	207	208
Canadys Refined Coal [Member]
Related Party Transaction [Line Items]
Purchases of coal from affiliate		38	45	100	123
Sales of coal to affiliate		$ 37	$ 45	$ 99	$ 122

[1] Includes capitalized expenditures of $13 million and $10 million for the three months ended September 30, 2019 and 2018, and $33 million and $29 million for the nine months ended September 30, 2019 and 2018, respectively

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income (loss)		$ (1,031)	$ 262
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment of assets and other charges		256	4
Provision for refunds to customers		923	0
Gain on sale of assets		(7)	0
Deferred income taxes, net		(384)	93
Depreciation and amortization		341	259
Amortization of nuclear fuel		41	41
Other adjustments		(5)	(11)
Changes in certain assets and liabilities:
Receivables		(9)	49
Receivables - affiliated and related party		(7)	(4)
Income tax receivable		0	198
Inventories		(66)	(15)
Prepayments		(9)	(13)
Regulatory assets		(109)	2
Regulatory liabilities		223	(102)
Accounts payable		(68)	(10)
Accounts payable - affiliated and related party		7	0
Revenue subject to refund		(74)	61
Taxes accrued		(22)	(39)
Other assets		124	(44)
Other liabilities		40	38
Net cash provided by operating activities		164	769
Investing Activities
Property additions and construction expenditures		(340)	(538)
Proceeds from investments and sales of assets		33	35
Purchase of investments		(42)	(21)
Purchase of investments - affiliate		0	(113)
Proceeds from interest rate derivative contract settlement		0	115
Investment in affiliate, net		336	(108)
Net cash used in investing activities		(13)	(630)
Financing Activities
Proceeds from issuance of debt		0	795
Proceeds from issuance of affiliated debt		230	0
Repayment of long-term debt, including redemption premiums		(1,890)	(824)
Dividend to parent		(30)	(164)
Contribution from parent		825	20
Contribution returned to parent		(20)	0
Money pool borrowings, net		441	157
Short-term borrowings, net		(73)	(79)
Net cash used in financing activities		(517)	(95)
Net increase (decrease) in cash, restricted cash and equivalents		(366)	44
Cash, restricted cash and equivalents at beginning of period	[1]	377	395
Cash, restricted cash and equivalents at end of period	[1]	11	439
Noncash investing and financing activities:
Accrued construction expenditures	[2]	47	25
Leases	[2],[3]	$ 7	$ 7

[1] At September 30, 2019, September 30, 2018, December 31, 2018 and December 31, 2017 there were no restricted cash and equivalent balances.

[2] See Note 1 for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.

[3] Includes $3 million of financing leases and $4 million of operating leases for the nine months ended September 30, 2019 and $7 million of capital leases for the nine months ended September 30, 2018.

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Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Utility plant in service	$ 13,056	$ 12,803
Accumulated depreciation and amortization	(4,799)	(4,581)
Construction work in progress	309	350
Nuclear fuel, net of accumulated amortization	185	211
Utility plant, net	8,751	8,783
Nonutility Property and Investments:
Nonutility property, net of accumulated depreciation	71	72
Assets held in trust, net-nuclear decommissioning	210	190
Other investments		1
Nonutility property and investments, net	281	263
Current Assets:
Cash and cash equivalents	11	377
Receivables, customer, net of allowance for uncollectible accounts	335	331
Affiliated and related party	30	359
Receivables, other	77	68
Inventories (at average cost):
Fuel	110	89
Materials and supplies	164	158
Prepayments	91	82
Regulatory assets	322	224
Other current assets	23	1
Total current assets	1,163	1,689
Deferred Debits and Other Assets:
Regulatory assets	3,970	4,060
Other	155	168
Total deferred debits and other assets	4,125	4,228
Total assets	14,320	14,963
CAPITALIZATION AND LIABILITIES
Common Stock - no par value	3,685	2,860
Retained earnings	214	1,279
Accumulated other comprehensive income (loss)	(3)	(3)
Total common equity	3,896	4,136
Noncontrolling interest	173	179
Total equity	4,069	4,315
Affiliated long-term debt	230	0
Long-term debt, net	3,378	5,132
Total long-term debt	3,608	5,132
Total capitalization	7,677	9,447
Current Liabilities:
Short-term borrowings		73
Current portion of long-term debt	7	14
Accounts payable	151	267
Affiliated and related party payables	795	347
Customer deposits and customer prepayments	71	73
Revenue subject to refund	3	77
Taxes accrued	206	228
Interest accrued	78	72
Regulatory liabilities	308	126
Reserves for litigation and regulatory proceedings	181	11
Other	66	42
Total current liabilities	1,866	1,330
Deferred Credits and Other Liabilities:
Deferred income taxes, net	605	989
Asset retirement obligations	493	542
Pension and other postretirement benefits	205	232
Regulatory liabilities	3,241	2,264
Other	218	143
Other affiliate	15	16
Total deferred credits and other liabilities	4,777	4,186
Commitments and Contingencies
Total capitalization and liabilities	$ 14,320	$ 14,963

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Fair Value Measurements, Including Derivatives (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

For financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows:

	September 30, 2019				December 31, 2018
(millions)	Carrying Amount		Estimated Fair Value(1)		Carrying Amount		Estimated Fair Value(2)
Long-term debt(3)	$	3,615	$	4,601	$	5,146	$	5,470

(1) Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

(2) Fair value is estimated based on net present value calculations using independently sourced market data that incorporate a developed discount rate using similarly rated long-term debt, along with benchmark interest rates. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

(3) Carrying amount includes amounts which represent the unamortized debt issuance costs and discount or premium.

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Operating Segments

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Operating Segments

13. OPERATING SEGMENTS

Operating segments include Electric Operations and Gas Distribution and are organized primarily on the basis of products and services sold.

In connection with the SCANA Combination, effective January 2019, reportable segments were changed to include a Corporate and Other segment and to utilize comprehensive income (loss) as the measure of segment profitability. The Corporate and Other segment includes specific items attributable to DESC's operating segments that are not included in profit measures evaluated by executive management in assessing the segments' performance or in allocating resources. Corresponding amounts in prior periods have been recast to conform to the current presentation.

In the nine months ended September 30, 2019, DESC reported after-tax net expenses of $1.4 billion for specific items in the Corporate and Other segment, with $1.4 billion attributable to its operating segments.

The net expense for specific items attributable to DESC’s operating segments in 2019 primarily related to the impact of the following items:

• A $1.0 billion ($756 million after-tax) charge for refunds of amounts previously collected from retail electric customers for the NND Project, attributable to Electric Operations;

• $266 million ($200 million after-tax) of charges associated with litigation, attributable to Electric Operations;

• A $198 million tax charge for $264 million of income tax-related regulatory assets for which DESC committed to forgo recovery, attributable to Electric Operations;

• A $114 million ($86 million after-tax) charge for utility plant primarily for which DESC committed to forgo recovery, attributable to Electric Operations;

• $90 million ($68 million after-tax) of merger and integration-related costs associated with the SCANA Combination, including a $75 million ($56 million after-tax) charge related to a voluntary retirement program, attributable to:

• Electric Operations ($61 million after-tax); and

• Gas Distribution ($7 million after-tax); and

• $59 million tax charges for changes in unrecognized tax benefits, attributable to Electric Operations.

(millions)	External Revenue			Comprehensive Income (Loss) Available (Attributable) to Common Shareholder
Three Months Ended September 30, 2019
Electric Operations	$	728		$	169
Gas Distribution		67			(1	)
Corporate and Other		—			(25	)
Adjustments/Eliminations		—			—
Consolidated Total	$	795		$	143
Three Months Ended September 30, 2018
Electric Operations	$	670		$	112
Gas Distribution		69			(7	)
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(6	)
Consolidated Total	$	739		$	98
Nine Months Ended September 30, 2019
Electric Operations	$	1,875		$	321
Gas Distribution		292			13
Corporate and Other		(1,009	)		(1,364	)
Adjustments/Eliminations		—			(14	)
Consolidated Total	$	1,158		$	(1,044	)
Nine Months Ended September 30, 2018
Electric Operations	$	1,770		$	242
Gas Distribution		304			22
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(15	)
Consolidated Total	$	2,074		$	248

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Rate and Other Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2019

Regulated Operations [Abstract]

Schedule of Regulatory Assets and Liabilities

	September 30,		December 31,
(millions)	2019		2018
Regulatory assets:
NND Project costs	$	138	$	127
Income taxes recoverable through future rates		52		—
Deferred employee benefit plan costs		13		16
Other unrecovered plant		14		14
DSM programs		16		14
Other		89		53
Regulatory assets - current		322		224
NND Project costs		2,537		2,641
AROs		315		380
Cost of reacquired debt		271		14
Deferred employee benefit plan costs		205		256
Deferred losses on interest rate derivatives		310		442
Other unrecovered plant		70		79
DSM programs		53		51
Environmental remediation costs		21		24
Deferred storm damage costs		43		35
Deferred transmission operating costs		32		15
Other		113		123
Regulatory assets - noncurrent		3,970		4,060
Total regulatory assets	$	4,292	$	4,284
Regulatory liabilities:
Monetization of guaranty settlement	$	67	$	61
Income taxes refundable through future rates		—		52
Reserve for refunds to electric utility customers		215		—
Other		26		13
Regulatory liabilities - current		308		126
Monetization of guaranty settlement		987		1,037
Income taxes refundable through future rates		912		607
Asset removal costs		554		541
Deferred gains on interest rate derivatives		72		75
Reserve for refunds to electric utility customers		707		—
Other		9		4
Regulatory liabilities - noncurrent		3,241		2,264
Total regulatory liabilities	$	3,549	$	2,390

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Long-Term and Short-Term Debt and Liquidity

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Long-Term and Short-Term Debt and Liquidity

5. LONG-TERM AND SHORT-TERM DEBT AND LIQUIDITY

Long-term Debt

In February 2019, DESC launched tender offers for certain of its first mortgage bonds pursuant to which it purchased first mortgage bonds having an aggregate purchase price equal to $1.2 billion. DESC incurred a loss on reacquired debt of $187 million in connection with these tender offers, which is recorded in regulatory assets on the Consolidated Balance Sheets.

In August 2019, DESC launched a tender offer for certain of its first mortgage bonds pursuant to which it purchased first mortgage bonds having an outstanding principal balance equal to $552 million. DESC incurred a net loss on reacquired debt of $83 million in connection with this tender offer, which is recorded in regulatory assets on the Consolidated Balance Sheets.

Long-term Debt - Affiliate

In May 2019, GENCO issued a $230 million 3.05% promissory note due to Dominion Energy that matures in May 2024. The issuance by GENCO was approved by the South Carolina Commission. Proceeds from the issuance were used to redeem GENCO’s 5.49%

senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest, repay money pool borrowings and to return $20 million of contributed equity capital to SCANA.

Liquidity

In March 2019, DESC became a co-borrower under Dominion Energy's $6 billion joint revolving credit facility. DESC's short-term financing is supported through its access to this joint revolving credit facility, which can be used for working capital, as support for the combined commercial paper programs of DESC, Dominion Energy and certain other of its subsidiaries (co-borrowers), and for other general corporate purposes.

DESC's share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, were as follows:

(millions)	Facility Limit		Outstanding Commercial Paper		Outstanding Letters of Credit
At September 30, 2019	$	1,000	$	—	$	—

A maximum of $1.0 billion of the facility is available to DESC, less any amounts outstanding to co-borrowers. A sub-limit for DESC is set within the facility limit but can be changed at the option of the co-borrowers multiple times per year. At September 30, 2019, the sub-limit for DESC was $500 million. If DESC has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term borrowings from DESC's parent or from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.0 billion (or the sub-limit, whichever is less) of letters of credit.

Also in March 2019, DESC canceled its previous committed long-term facility which was a revolving line of credit under a credit agreement with a syndicate of banks. This previous credit agreement was used for general corporate purposes, including liquidity support for DESC's commercial paper program and working capital needs, and was set to expire in December 2020.

(millions)	Facility Limit(1)		Outstanding Commercial Paper		Outstanding Letters of Credit
At December 31, 2018	$	1,200	$	73	$	—

(1) Included $500 million related to Fuel Company. In February 2019, Fuel Company's commercial paper program and its credit facility were terminated.

The weighted-average interest rate of the outstanding commercial paper supported by this credit facility was 3.82% at December 31, 2018.

In April 2019, DESC renewed its FERC authority to issue short-term indebtedness (pursuant to Section 204 of the Federal Power Act). DESC may issue unsecured promissory notes, commercial paper and direct loans in amounts not to exceed $2.2 billion outstanding with maturity dates of one year or less. In addition, in April 2019, GENCO renewed its FERC authority to issue short-term indebtedness not to exceed $200 million outstanding with maturity dates of one year or less. The authorities described herein will expire in April 2020, which reflects a one-year authorization period rather than the two-year period DESC and GENCO had requested. In granting the authorization for a shorter period, FERC cited certain regulatory and legislative proceedings at the state level, as well as certain legal proceedings, arising from the NND Project that could affect DESC's and GENCO's circumstances. Were adverse developments to occur with respect to these uncertainties, the ability of DESC or GENCO to secure renewal of this short-term borrowing authority may be adversely impacted.

DESC is obligated with respect to an aggregate of $68 million of industrial revenue bonds which are secured by letters of credit issued by TD Bank N.A. These letters of credit expire, subject to renewal, in the fourth quarter of 2019.

DESC received FERC approval to enter into an inter-company credit agreement in April 2019 with Dominion Energy under which DESC may have short-term borrowings outstanding up to $900 million. At September 30, 2019, DESC had borrowings outstanding under this credit agreement totaling $501 million, which are recorded in affiliated and related party payables in DESC’s Consolidated Balance Sheets. For both the three and nine months ended September 30, 2019, DESC recorded interest charges of $1 million.

DESC participated in a utility money pool with SCANA and another regulated subsidiary of SCANA through April 2019. Fuel Company and GENCO remain in the utility money pool. Money pool borrowings and investments bear interest at short-term market rates. For the three and nine months ended September 30, 2019, DESC recorded interest income from money pool transactions of $1 million and $7 million, respectively, and for the same periods DESC recorded interest expense from money pool transactions of $1 million and $7 million, respectively. For the three and nine months ended September 30, 2018, DESC recorded interest income from money pool transactions of $1 million and $2 million, respectively, and for the same periods DESC recorded interest expense from money pool transactions of $1 million and $2 million, respectively. DESC had outstanding money pool borrowings due to an affiliate of $222 million and investments due from an affiliate of $17 million at September 30, 2019. At December 31, 2018, DESC had outstanding money pool borrowings due to an affiliate of $282 million and investments due from an affiliate of $353 million. On its Consolidated Balance Sheets, DESC includes money pool borrowings within affiliated and related party payables and money pool investments within affiliated and related party receivables.

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Utility Plant and Nonutility Property

9 Months Ended

Sep. 30, 2019

Utility Plant And Non Utility Property [Abstract]

Utility Plant and Nonutility Property

9. UTILITY PLANT AND NONUTILITY PROPERTY

Sale of Warranty Service Contract Assets

In May 2019, DESC entered into an agreement to sell certain warranty service contract assets for total consideration of $7 million. The transaction closed in August 2019, resulting in a $7 million ($5 million after-tax) gain recorded in other income (expense), net in DESC’s Consolidated Statements of Comprehensive Income (Loss). Pursuant to the agreement, upon closing DESC entered into a commission agreement with the buyer under which the buyer will compensate DESC in connection with the right to use DESC’s brand in marketing materials and other services over a ten-year term.

Jointly Owned Utility Plant

DESC jointly owns and is the operator of Summer. Each joint owner provides its own financing and shares the direct expenses and generation output in proportion to its ownership. DESC’s share of the direct expenses in Summer is 66.7%. In May 2019, DESC and Santee Cooper entered into an agreement in which DESC agreed to purchase 11.7% of Santee Cooper’s ownership interest in the NND Project nuclear fuel, which will be used at Summer, for $8 million to true up the ownership percentage from the 55% ownership percentage that was applicable for the NND Project to the 66.7% ownership percentage applicable for Summer.

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Other Income (Expense), Net (Tables)

9 Months Ended

Sep. 30, 2019

Income Statement [Abstract]

Components of Other Income (Expense), Net

Components of other income (expense), net are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
(millions)	2019			2018			2019			2018
Revenues from contracts with customers	$	1		$	1		$	4		$	4
Other income		11			5			17			135
Other expense		(23	)		(10	)		(48	)		(22	)
Allowance for equity funds used during construction		(2	)		3			—			7
Other income (expense), net	$	(13	)	$	(1	)	$	(27	)	$	124

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Net Periodic Benefit Cost (Credit)

Components of net periodic benefit cost recorded by DESC were as follows:

(millions)	Pension Benefits						Other Postretirement Benefits
Three Months Ended September 30,	2019			2018			2019		2018
Service cost	$	4		$	5		$	1	$	1
Interest cost		6			7			2		2
Expected return on assets		(11	)		(12	)		—		—
Amortization of actuarial losses (gains)		2			3			—		(1	)
Settlement loss(1)		11			—			—		—
Net periodic benefit cost	$	12		$	3		$	3	$	2
Nine Months Ended September 30,
Service cost	$	11		$	13		$	2	$	3
Interest cost		21			22			6		6
Expected return on assets		(31	)		(36	)		—		—
Amortization of actuarial losses		9			8			—		—
Curtailment(1)		6			—			3		—
Settlement loss(1)		11			—			—		—
Net periodic benefit cost	$	27		$	7		$	11	$	9

(1) Related to a voluntary retirement program.

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Rate and Other Regulatory Matters (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Regulatory Liabilities
Regulatory liability, current	$ 308	$ 126
Regulatory liability, noncurrent	3,241	2,264
Total regulatory liabilities	3,549	2,390
Monetization Of Guaranty Settlement [Member]
Regulatory Liabilities
Regulatory liability, current	67	61
Regulatory liability, noncurrent	987	1,037
Income Taxes Refundable Through Future Rates [Member]
Regulatory Liabilities
Regulatory liability, current		52
Regulatory liability, noncurrent	912	607
Reserve For Refunds To Electric Utility Customers [Member]
Regulatory Liabilities
Regulatory liability, current	215	0
Regulatory liability, noncurrent	707	0
Other Regulatory Liability [Member]
Regulatory Liabilities
Regulatory liability, current	26	13
Regulatory liability, noncurrent	9	4
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities
Regulatory liability, noncurrent	554	541
Deferred Gains On Interest Rate Derivatives [Member]
Regulatory Liabilities
Regulatory liability, noncurrent	$ 72	$ 75

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Leases (Schedule Of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Utility Plant, Net
Finance lease assets, accumulated amortization	$ 22

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Derivative Financial Instruments (Derivative Contracts with Credit Contingent Features) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Aggregate fair value of derivatives in net liability position	$ 23	$ 11
Fair value of collateral already posted	23	11
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$ 0	$ 0

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Employee Benefit Plans (Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits
Components of Net Periodic Benefit Cost
Service cost		$ 4	$ 5	$ 11	$ 13
Interest cost		6	7	21	22
Expected return on assets		(11)	(12)	(31)	(36)
Amortization of actuarial losses (gains)		2	3	9	8
Curtailment	[1]			6	0
Settlement loss	[1]	11	0	11	0
Net periodic benefit cost		12	3	27	7
Other Postretirement Benefits
Components of Net Periodic Benefit Cost
Service cost		1	1	2	3
Interest cost		2	2	6	6
Expected return on assets		0	0	0	0
Amortization of actuarial losses (gains)		0	(1)	0	0
Curtailment	[1]			3	0
Settlement loss	[1]	0	0	0	0
Net periodic benefit cost		$ 3	$ 2	$ 11	$ 9

[1] Related to a voluntary retirement program.