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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($)
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 3,254
Losses, Deferred tax asset | 1,059
Losses, Valuation allowance | (130)
Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 3
Losses, Deferred tax asset | 308
Losses, Valuation allowance | (8)
Federal |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 576
Losses, Deferred tax asset | $ 121
Losses, Expiration Period | 2037
Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 264
Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 241
Federal | Investment Credits | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2041
Federal | Investment Credits | Earliest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2041
Federal | Investment Credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2043
Federal | Investment Credits | Latest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2043
Federal | Federal Production and Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 91
Federal | Federal Production and Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 58
Federal | Federal Production and Other Credits | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2041
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 | 2041
Federal | Federal Production and Other Credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2043
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 | 2043
State |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 2,678
Losses, Deferred tax asset | 131
Losses, Valuation allowance | (51)
State minimum tax credits | 327
State | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 3
Losses, Expiration Period | 2042
State | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2024
State | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2043
State | Investment and Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Losses, Valuation allowance | $ (79)
Tax credits, Deferred tax asset | 125
State | Investment and Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Losses, Valuation allowance | (8)
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 | 2024
State | Investment and Other Credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2033

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