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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 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Total Derivative-Hedging Activities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | $ 64 | $ 64 | $ 73 | $ 70 | $ 79 | $ 83
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | (6) | (8) | (5) | (11) | (4) | (5)
Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | (5) | 3 | (2) | 16 | 9 | 13
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | (2) | 0 | 0 | 3 | 1 | 2
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | 522 | 522 | 456 | 461 | 453 | 445
Equity Method Investees |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 1

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