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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Parenthetical) (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Total Derivative-Hedging Activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | $ 61 | $ 58 | $ 68 | $ 73
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | (7) | (10) | (7) | (5)
Investment Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 0 | 5 | 6 | (2)
Investment Securities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 0 |  | 1 |
Pension and Other Postretirement Benefit Costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | $ (9) | $ (9) | $ (10) | $ (14)

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