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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 1,246
Deferred Tax Asset | 1,546
Valuation Allowance | (151)
Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 1
Deferred Tax Asset | 183
Valuation Allowance | (5)
Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 53
Deferred Tax Asset | 6
Valuation Allowance | (5)
Federal |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 120
Losses, Deferred tax asset | 25
Losses, Valuation allowance | 0
Tax credits, Deferred tax asset | 62
Federal | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | $ 1
Losses, Expiration Period | 2034
Federal | Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deductible amount | $ 0
Tax credits, Deferred tax asset | 1
Tax Credits, Valuation allowance | 0
Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 1,007
Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 113
Federal | Federal production credits |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 150
Federal | Federal Production And Other Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 61
State |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 1,126
Losses, Deferred tax asset | 73
Losses, Valuation allowance | (61)
State minimum tax credits | 122
State | Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Deductible amount | 53
Losses, Deferred tax asset | 5
Losses, Valuation allowance | (5)
State | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 9
Tax Credits, Valuation allowance | (5)
State | Investment and Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Tax credits, Deferred tax asset | 107
Tax Credits, Valuation allowance | $ (90)
Earliest Tax Year | Federal |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2031
Earliest Tax Year | Federal | Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2032
Earliest Tax Year | Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2033
Earliest Tax Year | Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2034
Earliest Tax Year | Federal | Federal production credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2031
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 | 2031
Earliest Tax Year | State |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2019
Earliest Tax Year | State | Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2036
Earliest Tax Year | State | Investment and Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2019
Latest Tax Year | Federal |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2034
Tax Credits, Expiration Period | 2038
Latest Tax Year | Federal | Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2037
Latest Tax Year | Federal | Investment Credits |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2038
Latest Tax Year | Federal | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2038
Latest Tax Year | Federal | Federal production 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 | 2038
Latest Tax Year | State |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2038
Latest Tax Year | State | Dominion Energy Gas Holdings, LLC |
Deductible loss and credit carryforwards [Line Items] |
Losses, Expiration Period | 2038
Latest Tax Year | State | Investment Credits | Virginia Electric and Power Company |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2024
Latest Tax Year | State | Investment and Other Credit |
Deductible loss and credit carryforwards [Line Items] |
Tax Credits, Expiration Period | 2025

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