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Investments (Narrative) (Detail) |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) | Nov. 30, 2020 | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2019 | Sep. 30, 2018 USD ($) | Oct. 31, 2017 USD ($) | Sep. 30, 2014 mi | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings(losses) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  | $ 8,000,000 |  | $ 76,000,000 |  |
Net income (loss) from discontinued operations including noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  | $ (125,000,000) |  | $ 19,000,000 | $ (2,001,000,000) | $ 229,000,000 | $ 190,000,000 | $ 38,000,000 | $ 257,000,000 | $ 231,000,000 | (1,878,000,000) | [1],[2] | 716,000,000 | [1],[2] | 452,000,000 | [1],[2] |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,000,000 |  | 38,000,000 |  | 111,000,000 |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  | $ (35,000,000) |  |  |  |  | $ 213,000,000 |  | 213,000,000 |  |  |  |  | (35,000,000) |  |  |  | 213,000,000 |  | (35,000,000) |  |  |  |
Equity method investment goodwill |  |  |  |  | 11,000,000 |  |  |  |  | 27,000,000 |  | 27,000,000 |  |  |  |  | 11,000,000 |  |  |  | 27,000,000 |  | 11,000,000 |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,411,000,000 |  | 869,000,000 |  | 2,619,000,000 |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148,000,000 |  | 209,000,000 |  | 428,000,000 |  |
Current liabilities held for sale |  |  |  |  | 1,039,000,000 |  |  |  |  | 625,000,000 |  | 625,000,000 |  |  |  |  | 1,039,000,000 |  |  |  | 625,000,000 |  | 1,039,000,000 |  |  |  |
Debt maximum borrowing capacity | [3] |  |  |  | 6,000,000,000 |  |  |  |  | 6,000,000,000 | [4] | 6,000,000,000 | [4] |  |  |  | 6,000,000,000 |  |  |  | 6,000,000,000 | [4] | 6,000,000,000 |  |  |  |
Guarantee liability | [5] |  |  |  |  |  |  |  |  | 3,527,000,000 |  | 3,527,000,000 |  |  |  |  |  |  |  |  | 3,527,000,000 |  |  |  |  |  |
Retained earnings |  |  |  |  | 7,576,000,000 |  |  |  |  | 4,189,000,000 |  | 4,189,000,000 |  |  |  |  | 7,576,000,000 |  |  |  | 4,189,000,000 |  | 7,576,000,000 |  |  |  |
Other | [6] |  |  |  | 2,132,000,000 |  |  |  |  | 1,725,000,000 |  | 1,725,000,000 |  |  |  |  | 2,132,000,000 |  |  |  | 1,725,000,000 |  | 2,132,000,000 |  |  |  |
Operating revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,752,000,000 |  | 13,745,000,000 |  | 10,891,000,000 |  |
Other receivables |  |  |  |  | 340,000,000 |  |  |  |  | 212,000,000 |  | 212,000,000 |  |  |  |  | 340,000,000 |  |  |  | 212,000,000 |  | 340,000,000 |  |  |  |
Income tax expense |  | $ 336,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83,000,000 |  | 209,000,000 |  | 522,000,000 |  |
Current assets | [7] |  |  |  | 535,000,000 |  |  |  |  | 1,482,000,000 |  | 1,482,000,000 |  |  |  |  | 535,000,000 |  |  |  | 1,482,000,000 |  | 535,000,000 |  |  |  |
Assets |  |  |  |  | 6,096,000,000 |  |  |  |  | 6,886,000,000 |  | 6,886,000,000 |  |  |  |  | 6,096,000,000 |  |  |  | 6,886,000,000 |  | 6,096,000,000 |  |  |  |
Liabilities |  |  |  |  | $ 9,940,000,000 |  |  |  |  | 10,843,000,000 |  | 10,843,000,000 |  |  |  |  | $ 9,940,000,000 |  |  |  | 10,843,000,000 |  | $ 9,940,000,000 |  |  |  |
Retail Energy Marketing Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  | 63,000,000 |  | 63,000,000 |  |  |  |  |  |  |  |  | 63,000,000 |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  | 15,000,000 |  | $ 15,000,000 |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
Ownership percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings(losses) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,300,000,000) |  | $ 117,000,000 |  | 67,000,000 |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 107,000,000 |  | $ 186,000,000 |  | 414,000,000 |  |
Cost to acquire equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 184,000,000 |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in total units |  |  |  |  | 48.00% |  |  |  |  | 53.00% |  | 53.00% |  |  |  |  | 48.00% |  |  |  | 53.00% |  | 48.00% |  |  |  |
Equity in earnings (losses) on investments after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,800,000,000) |  | $ 118,000,000 |  | 67,000,000 |  |
Current liabilities held for sale |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Financial Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee liability |  |  |  |  | $ 14,000,000 |  |  |  |  | 6,000,000 |  | 6,000,000 |  |  |  |  | $ 14,000,000 |  |  |  | 6,000,000 |  | 14,000,000 |  |  |  |
Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  |  |  | $ 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 of Changes in Accounting Principles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  | 48,000,000 |  | 48,000,000 |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |  |  |
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 |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  | 7,000,000 |  |  |  |
Operating revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,000,000 |  | 103,000,000 |  | $ 203,000,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Blue Racer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Additional consideration including interest received in connection with sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151,000,000 |  |  |  |  |  |  |
Fowler Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  | 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 |  |  |  |  |  |
Wrangler Retail Gas Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  | 20.00% |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,000,000 |  | $ 147,000,000 |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,000,000 |  | 301,000,000 |  |  |  |
Initial fair value |  |  |  |  | 75,000,000 |  |  |  |  | 13,000,000 |  | 13,000,000 |  |  |  |  | 75,000,000 |  |  |  | 13,000,000 |  | 75,000,000 |  |  |  |
Goodwill write-off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,000,000 |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  | 82,000,000 |  |  |  |
Current assets |  |  |  |  | 41,000,000 |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 |  |  |  |  |  | 41,000,000 |  |  |  |
Catalyst Old River Hydroelectric Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  |  | $ (46,000,000) |  |  |  |  | $ (41,000,000) |  | $ (41,000,000) |  |  |  |  | (46,000,000) |  |  |  | (41,000,000) |  | (46,000,000) |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations including noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,300,000,000) |  | 117,000,000 |  | $ 67,000,000 |  |
Ownership percentage | [8] |  |  |  |  |  |  |  |  | 53.00% |  | 53.00% |  |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | [9] |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Cove Point | Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings(losses) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
Ownership interest percentage of limited partner interests |  |  | 25.00% |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 511,000,000 |  | 471,000,000 |  | 292,000,000 |  |
Cove Point | Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  |  |  |  |  |  |  | $ 227,000,000 |  | $ 227,000,000 |  |  |  |  |  |  |  |  | 227,000,000 |  |  |  |  |  |
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 equity interest sold to noncontrolling interest owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Blue Racer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 546,000,000 |  |
Amount of after tax gain from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 390,000,000 |  |
Up-front cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,050,000,000.00 |  |
Additional deferred consideration, subject to increase for interest cost effective payable upon purchaser's availability of cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |
Aggregate amount of contingent consideration, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
Catalyst Old River Hydroelectric Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  |  |  |  | $ 91,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Catalyst Old River Hydroelectric Limited Partnership | Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  | 87,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of after tax gain from sale |  |  |  |  |  |  | $ 63,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  |  | $ 120,000,000 |  |  |  |  | $ 134,000,000 |  | $ 134,000,000 |  |  |  |  | $ 120,000,000 |  |  |  | $ 134,000,000 |  | $ 120,000,000 |  |  |  |
[1] | Includes income tax expense (benefit) of $(204) million, $142 million and $58 million for the years ended December 31, 2020, 2019 and 2018, respectively
[2] | See Note 9 for amounts attributable to related parties
[3] | 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.
[4] | In October 2020, the joint revolving credit facility was amended to remove Dominion Energy Gas as a co-borrower.
[5] | Excludes Dominion Energy’s guarantees for the new corporate office properties and an offshore wind installation vessel discussed in Note 15.
[6] | See Note 9 for amounts attributable to related parties.
[7] | See Note 9 for amounts attributable to related parties.
[8] | Dominion Energy owned 53% and 48% of Atlantic Coast Pipeline at December 31, 2020 and 2019, respectively. See discussion below for additional information.
[9] | Effective November 2020, following the completion of the GT&S Transaction, Dominion Energy began accounting for its 50% noncontrolling interest in Cove Point as an equity method investment. See discussion below and Note 3 for additional information.

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