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Operating Revenue (Schedule of Aggregate Amount of Transaction Price Allocated To Fixed-price Performance Obligations That Unsatisfied At End of Reporting Period And Expected To be Recognized) (Detail) $ in Millions | Sep. 30, 2019 USD ($)
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Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 19,467
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2019-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 431
Revenue, expected to be recognized on multi-year contracts, period | 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2020-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,545
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2021-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,446
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2022-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,344
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2023-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,199
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2024-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 13,502
Revenue, expected to be recognized on multi-year contracts, period |
Virginia Electric and Power Company |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 9
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2019-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 5
Revenue, expected to be recognized on multi-year contracts, period | 3 months
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2020-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 3
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2021-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2022-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 0
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2023-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 0
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2024-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 0
Revenue, expected to be recognized on multi-year contracts, period |
Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 20,186
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2019-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 455
Revenue, expected to be recognized on multi-year contracts, period | 3 months
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2020-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,658
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2021-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,559
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2022-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,436
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2023-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,268
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date:: 2024-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 13,810
Revenue, expected to be recognized on multi-year contracts, period |

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