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Asset Retirement Obligations (Changes to AROs) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Asset Retirement Obligations [Line Items] |  |
Asset retirement obligations, non current | $ 4,866 | $ 2,250
Current Liabilities |  |
Asset Retirement Obligations [Line Items] |  |
Asset retirement obligation, current | 408 | 282
Virginia Electric and Power Company |  |
Asset Retirement Obligations [Line Items] |  |
Asset retirement obligations, non current | 3,241 | 1,200
Asset retirement obligation, current | $ 340 | 245
License extension term | 20 years |
Dominion Energy Gas Holdings, LLC | Other Deferred Credits And Other Liabilities |  |
Asset Retirement Obligations [Line Items] |  |
Asset retirement obligations, non current | $ 75 | $ 74

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