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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($)
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 4,830
Losses, Deferred tax asset | 1,561
Losses, Valuation allowance | (155)
Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Losses, Deferred tax asset | 354
Losses, Valuation allowance | (6)
Federal |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 1,169
Losses, Deferred tax asset | $ 246
Losses, Expiration Period | 2037
Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 736
Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 294
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 | 2040
Federal | Investment Credits | Latest Tax Year | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2040
Federal | Federal production credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 86
Federal | Federal production credits | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2036
Federal | Federal production credits | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2040
Federal | Federal Production And Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 14
Federal | Federal Production And Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 51
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 | 2039
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 | 2040
State |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 3,661
Losses, Deferred tax asset | 198
Losses, Valuation allowance | (61)
State minimum tax credits | $ 139
State | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2020
State | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2040
State | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Losses, Valuation allowance | $ (6)
Tax credits, Deferred tax asset | $ 9
Tax Credits, Expiration Period | 2024
State | Investment And Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Losses, Valuation allowance | $ (94)
Tax credits, Deferred tax asset | $ 142
State | Investment And Other Credit | Earliest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2020
State | Investment And Other Credit | Latest Tax Year |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2031

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