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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 | Mar. 31, 2019 USD ($)
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Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 20,254
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 | $ 1,197
Revenue, expected to be recognized on multi-year contracts, period | 9 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 | $ 1,547
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: 2022-01-01 |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 1,334
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 | $ 1,166
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 | $ 13,562
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 | $ 20
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 | $ 16
Revenue, expected to be recognized on multi-year contracts, period | 9 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 | $ 4,330
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 | $ 476
Revenue, expected to be recognized on multi-year contracts, period | 9 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 | $ 623
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 | $ 545
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 | $ 441
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 | $ 317
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 | $ 1,928
Revenue, expected to be recognized on multi-year contracts, period |

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