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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, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Total Derivative-Hedging Activities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | $ 87 | $ 94 | $ 119 | $ 121 | $ 125 | $ 141
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | (4) |  | 16 | 14 | 14 | 21
Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | 23 | 14 | (10) | (11) | (12) | (21)
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | 4 | 3 | (2) | (2) | (2) | (3)
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | 367 | 376 | 396 | 448 | $ 455 | $ 478
Equity Method Investees |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | $ 1 | $ 1 | $ 1 | $ 1 |  |

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