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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 | Dec. 31, 2018 USD ($)
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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 | $ 1,643
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01 | Virginia Electric and Power Company |
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01 | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 600
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 | $ 1,563
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 | Virginia Electric and Power Company |
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01 | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 560
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 | $ 1,448
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 | Virginia Electric and Power Company |
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01 | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 475
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 | $ 1,319
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 | Virginia Electric and Power Company |
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01 | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 384
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 | $ 1,154
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 | Virginia Electric and Power Company |
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01 | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 268
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 | $ 13,693
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 | Virginia Electric and Power Company |
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01 | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,612
Revenue, expected to be recognized on multi-year contracts, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil) [Member] |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 20,820
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil) [Member] | Virginia Electric and Power Company |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | 25
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil) [Member] | Dominion Energy Gas Holdings, LLC |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 3,899

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