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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 6,443
Losses, Deferred tax asset | 1,822
Losses, Valuation allowance | (137)
Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 513
Losses, Deferred tax asset | 751
Losses, Valuation allowance | (7)
Federal |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 778
Losses, Deferred tax asset | $ 163
Losses, Expiration Period | 2037
Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 874
Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 631
Federal | Investment Credits | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2036
Federal | Investment Credits | Earliest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2036
Federal | Investment Credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2042
Federal | Investment Credits | Latest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2042
Federal | Federal Production and Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 82
Federal | Federal Production and Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 80
Federal | Federal Production and Other Credits | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2036
Federal | Federal Production and Other Credits | Earliest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2036
Federal | Federal Production and Other Credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2042
Federal | Federal Production and Other Credits | Latest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2042
State |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 5,665
Losses, Deferred tax asset | 305
Losses, Valuation allowance | (51)
State minimum tax credits | 271
State | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 513
Losses, Deferred tax asset | $ 31
Losses, Expiration Period | 2042
State | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2023
State | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2042
State | Investment and Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Losses, Valuation allowance | $ (86)
Tax credits, Deferred tax asset | 127
State | Investment and Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Losses, Valuation allowance | (7)
Tax credits, Deferred tax asset | $ 9
Tax Credits, Expiration Period | 2024
State | Investment and Other Credits | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2023
State | Investment and Other Credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2032

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