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Investments (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Oct. 31, 2017 USD ($) | Sep. 30, 2014 mi | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 | Jul. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings(losses) on investments |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
Net income (loss) from discontinued operations including noncontrolling interest | [1],[2] |  |  |  | $ 19,000,000 | $ 38,000,000 |  | $ (1,753,000,000) | 526,000,000 |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  | 25,000,000 | 28,000,000 |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  | $ (19,000,000) |  |  | (19,000,000) |  |  | (19,000,000) |  |  |  |  | $ (35,000,000) |
Equity method investment goodwill |  | 27,000,000 |  |  | 27,000,000 |  |  | 27,000,000 |  |  |  |  | 11,000,000 |
Current liabilities |  | 6,880,000,000 |  |  | 6,880,000,000 |  |  | 6,880,000,000 |  |  |  |  | 1,039,000,000 | [3]
Maximum obligation amount under credit facility | [4],[5] | 6,000,000,000 |  |  | 6,000,000,000 |  |  | 6,000,000,000 |  |  |  |  |  |
Guarantee liability | [6] | 5,717,000,000 |  |  | 5,717,000,000 |  |  | 5,717,000,000 |  |  |  |  |  |
Cumulative-effect of changes in accounting principles |  | 4,035,000,000 |  |  | 4,035,000,000 |  |  | 4,035,000,000 |  |  |  |  | 7,576,000,000 | [3]
Contributions to equity method affiliates |  |  |  |  |  |  |  | 92,000,000 | 187,000,000 |  |  |  |  |
Other payables | [2] | 2,376,000,000 |  |  | 2,376,000,000 |  |  | 2,376,000,000 |  |  |  |  | 1,738,000,000 | [3]
Revenue |  |  |  |  | 3,536,000,000 | 3,623,000,000 |  | 10,350,000,000 | 9,993,000,000 |  |  |  |  |
Other receivables |  | 174,000,000 |  |  | 174,000,000 |  |  | 174,000,000 |  |  |  |  | 340,000,000 | [3]
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings(losses) on investments |  |  |  |  | (61,000,000) | 31,000,000 |  | (2,300,000,000) | 84,000,000 |  |  |  |  |
Cost to acquire equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 184,000,000 |  |
Equity in earnings(losses) on investments after tax |  |  |  |  | (45,000,000) | 31,000,000 |  | (1,800,000,000) | 85,000,000 |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  | 45,000,000 | 47,000,000 |  | 74,000,000 | 175,000,000 |  |  |  |  |
Atlantic Coast Pipeline | Financial Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee liability |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |
Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum obligation amount under credit facility |  |  | $ 3,400,000,000 |  |  |  |  |  |  |  | $ 1,900,000,000 |  |  |
Credit facility, maturity date |  |  | Oct. 31, 2021 |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  | 1,800,000,000 |  |  | 1,800,000,000 |  |  | 1,800,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Revolving Credit Facility | Financial Guarantee | Cumulative Effect Period Of Adoption Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect of changes in accounting principles |  | (48,000,000) |  |  | (48,000,000) |  |  | (48,000,000) |  |  |  |  |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  | 1,100,000,000 |  |  | 1,100,000,000 |  |  | 1,100,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Percentage ownership in total units |  |  |  |  |  |  |  |  |  |  |  | 53.00% |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other payables |  | $ 15,000,000 |  |  | 15,000,000 |  |  | 15,000,000 |  |  |  |  | 7,000,000 |
Revenue |  |  |  |  | $ 7,000,000 | $ 24,000,000 |  | $ 44,000,000 | 81,000,000 |  |  |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of natural gas pipeline (in miles) | mi |  |  |  | 600 |  |  |  |  |  |  |  |  |  |
Duration of contract |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Blue Racer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration including interest received in connection with sale |  |  |  |  |  |  | $ 151,000,000 |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Fowler Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest held |  | 50.00% |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |
Net payment of long-term power and capacity contract |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contract termination loss |  | 221,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contract termination loss net of tax |  | 165,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings(losses) on investments |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Maximum | Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other receivables |  | 1,000,000 |  |  | $ 1,000,000 |  |  | 1,000,000 |  |  |  |  | 7,000,000 |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations including noncontrolling interest |  |  |  |  |  |  |  | (2,300,000,000) | $ 84,000,000 |  |  |  |  |
Pivotal LNG | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Pivotal LNG | JAX LNG LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest held |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  | (46,000,000) |  |  | (46,000,000) |  |  | (46,000,000) |  |  |  |  | (46,000,000) |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  | $ 132,000,000 |  |  | $ 132,000,000 |  |  | $ 132,000,000 |  |  |  |  | $ 120,000,000 |
[1] | Includes income tax expense (benefit) of $(10) million and $136 million for the three months ended September 30, 2020 and 2019, respectively and $(572) million and $47 million for the nine months ended September 30, 2020 and 2019, respectively.
[2] | See Note 10 for amounts attributable to related parties.
[3] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | In October 2020, the joint revolving credit facility was amended to remove Dominion Energy Gas as a co-borrower.
[5] | This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[6] | Excludes Dominion Energy's guarantees for the new corporate office properties discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2019 and in Note 14 in this report.

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