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Investments (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Oct. 31, 2017 USD ($) | Sep. 30, 2014 mi | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  |  |  |  | $ (2,281,000,000) | $ 39,000,000 |  | $ (2,228,000,000) | $ 80,000,000 |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  | 46,000,000 | 57,000,000 |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  | 96,000,000 | 110,000,000 |  | 96,000,000 | 110,000,000 |  |  |  |
Equity method investment goodwill |  |  |  |  | 175,000,000 | 159,000,000 |  | 175,000,000 | 159,000,000 |  |  |  |
Cost to acquire equity method investments |  |  |  |  |  |  |  |  |  |  | $ 184,000,000 |  |
Maximum obligation amount under credit facility | [1] |  |  |  | 6,000,000,000 |  |  | 6,000,000,000 |  |  |  |  |
Guarantee liability | [2] |  |  |  | 5,248,000,000 |  |  | 5,248,000,000 |  |  |  |  |
Cumulative-effect of changes in accounting principles |  |  |  |  |  |  |  | (48,000,000) |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  | 178,000,000 | 0 |  |  |  |
Other payables | [3] |  |  |  | 2,446,000,000 |  |  | 2,446,000,000 |  |  |  | $ 1,827,000,000 | [4]
Investment in equity method affiliates |  |  |  |  | 584,000,000 |  |  | 584,000,000 |  |  |  | 1,646,000,000 | [4]
Revenue |  |  |  |  | 3,470,000,000 | 3,746,000,000 |  | 7,793,000,000 | 7,376,000,000 |  |  |  |
Other receivables | [3] |  |  |  | 233,000,000 |  |  | 233,000,000 |  |  |  | 367,000,000 | [4]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  |  |  |  | 8,000,000 | 9,000,000 |  | 23,000,000 | 22,000,000 |  |  |  |
Maximum obligation amount under credit facility | [5] |  |  |  | 1,500,000,000 |  |  | 1,500,000,000 |  |  |  |  |
Other payables | [6] |  |  |  | 382,000,000 |  |  | 382,000,000 |  |  |  | 289,000,000 | [7]
Investment in equity method affiliates |  |  |  |  | 310,000,000 |  |  | 310,000,000 |  |  |  | 312,000,000 | [7]
Revenue |  |  |  |  | 509,000,000 | 529,000,000 |  | 1,064,000,000 | 1,094,000,000 |  |  |  |
Other receivables | [6] |  |  |  | 12,000,000 |  |  | 12,000,000 |  |  |  | 26,000,000 | [7]
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  |  |  |  |  |  |  | 23,000,000 | 22,000,000 |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  | 25,000,000 | 30,000,000 |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  | 146,000,000 |  |  | 146,000,000 |  |  |  | 146,000,000 |
Investment in equity method affiliates |  |  |  |  | 310,000,000 |  |  | 310,000,000 |  |  |  | 312,000,000 |
Pivotal LNG | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  |  |  |  | (2,300,000,000) | 29,000,000 |  | (2,300,000,000) | 53,000,000 |  |  |  |
Net income (losses) from abandonment of project |  |  |  |  | (4,400,000,000) | 61,000,000 |  | (4,300,000,000) | 114,000,000 |  |  |  |
Contributions to equity method affiliates |  |  |  |  | 13,000,000 | 33,000,000 |  | 29,000,000 | 128,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  | Oct. 31, 2021 |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  |  |  |  | 1,800,000,000 |  |  | 1,800,000,000 |  |  |  |  |
Atlantic Coast Pipeline | Revolving Credit Facility | Financial Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect of changes in accounting principles |  |  |  |  |  |  |  | (48,000,000) |  |  |  |  |
Atlantic Coast Pipeline | Subsequent Event | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum obligation amount under credit facility |  | $ 1,900,000,000 |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities from abandonment of project |  |  |  |  | 1,000,000.0 |  |  | 1,000,000.0 |  |  |  |  |
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 |  |  |  |  | 5,000,000 |  |  | 5,000,000 |  |  |  | 7,000,000 |
Revenue |  |  |  |  | 17,000,000 | $ 26,000,000 |  | 37,000,000 | $ 57,000,000 |  |  |  |
Other receivables |  |  |  |  | 7,000,000 |  |  | 7,000,000 |  |  |  | 7,000,000 |
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 |  |  |  |  |  |  |  |  |
JAX LNG LLC | Pivotal LNG |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest held |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest held |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Net payment of long-term power and capacity contract |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Contract termination loss |  | 220,000,000 |  |  |  |  |  |  |  |  |  |  |
Contract termination loss net of tax |  | $ 170,000,000 |  |  |  |  |  |  |  |  |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  |  | 79,000,000 |  |  | 79,000,000 |  |  |  | 49,000,000 |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  |  | $ 121,000,000 |  |  | $ 121,000,000 |  |  |  | $ 120,000,000 |
[1] | 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.
[2] | 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.
[3] | See Note 10 for amounts attributable to related parties.
[4] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[5] | A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At June 30, 2020, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings 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 $1.5 billion (or the sub-limit, whichever is less) of letters of credit.
[6] | See Note 19 for amounts attributable to related parties.
[7] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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