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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 4,435
Losses, Deferred tax asset | 1,856
Losses, Valuation allowance | (155)
Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deferred Tax Asset | 280
Valuation Allowance | (5)
Federal |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 1,361
Losses, Deferred tax asset | $ 286
Losses, Expiration Period | 2037
Tax credits, Deferred tax asset | $ 40
Federal | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deferred Tax Asset | 213
Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 922
Federal | Federal production credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 126
Federal | Federal Production And Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deferred Tax Asset | 58
State |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 3,074
Losses, Deferred tax asset | 173
Losses, Valuation allowance | (57)
State minimum tax credits | 165
State | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deferred Tax Asset | 9
Tax Credits, Valuation allowance | $ (5)
Tax Credits, Expiration Period | 2024
State | Investment and Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | $ 144
Tax Credits, Valuation allowance | $ (98)
Earliest Tax Year | Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2035
Earliest Tax Year | Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2035
Earliest Tax Year | Federal | Federal production credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2035
Earliest Tax Year | Federal | Federal Production And Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2035
Earliest Tax Year | Federal | Federal Production And Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2035
Earliest Tax Year | State |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2020
Earliest Tax Year | State | Investment and Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2020
Latest Tax Year | Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2039
Latest Tax Year | Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2039
Latest Tax Year | Federal | Federal production credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2039
Latest Tax Year | Federal | Federal Production And Other Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2038
Latest Tax Year | Federal | Federal Production And Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2039
Latest Tax Year | State |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2038
Latest Tax Year | State | Investment and Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2031

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