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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 | Jun. 30, 2018 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-07-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 851
Revenue, expected to be recognized on multi-year contracts, period | 6 months
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 | $ 1,686
Revenue, expected to be recognized on multi-year contracts, period | 1 year
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 | $ 1,578
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 | $ 1,466
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 | $ 1,335
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 | $ 15,240
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil) |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | 22,156
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-07-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 11
Revenue, expected to be recognized on multi-year contracts, period | 6 months
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 | $ 21
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: 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: (nil) |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 36
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-07-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 324
Revenue, expected to be recognized on multi-year contracts, period | 6 months
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 | $ 633
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: 2020-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 570
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 | $ 485
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 | $ 394
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 | $ 2,168
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil) |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 4,574

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