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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, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Total Derivative-Hedging Activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | $ 107 | $ 119 | $ 123 | $ 141
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 9 | 16 | 10 | 21
Investment Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 8 | (10) | (11) | (21)
Investment Securities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 1 | (2) | (2) | (3)
Pension and Other Postretirement Benefit Costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | 380 | 396 | $ 468 | $ 478
Equity Method Investees |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amount of tax | $ 1 | $ 1 |  |

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