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Equity (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Total Derivative-Hedging Activities |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Amount of tax | $ 58 | $ 73 | $ 83
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Amount of tax | (10) | (5) | (5)
Investment Securities |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Amount of tax | 5 | (2) | 13
Investment Securities | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Amount of tax |  |  | 2
Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Amount of tax | $ (9) | $ (14) | (19)
Equity Method Investees |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Amount of tax |  |  | $ 1

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