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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, 2023 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 662 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-04-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts, period | 9 months |
Revenue, expected to be recognized on multi-year contracts | $ 51 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, expected to be recognized on multi-year contracts | $ 61 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, expected to be recognized on multi-year contracts | $ 54 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts, period | 2026 years |
Revenue, expected to be recognized on multi-year contracts | $ 48 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, expected to be recognized on multi-year contracts | $ 46 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts, period |  |
Revenue, expected to be recognized on multi-year contracts | $ 402 | [1]
[1] | Includes no amounts for Virginia Power

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