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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, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Total Derivative-Hedging Activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | $ 83 | $ 83 | $ 107 | $ 119
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | (2) | (5) | 9 | 16
Investment Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 6 | 13 | 8 | (10)
Investment Securities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 1 | 2 | 1 | (2)
Pension and Other Postretirement Benefit Costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | $ 449 | 445 | 380 | 396
Equity Method Investees |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax |  | $ 1 | $ 1 | $ 1

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