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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deductible loss and credit carryforwards [Line Items] |  |
Deferred Tax Asset | $ 1,536 | $ 1,547
Valuation Allowance | (146) |
Deductible amount | 1,926 |
Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Deferred Tax Asset | 111 | 88
Valuation Allowance | (5) |
Deductible amount | 1 |
Dominion Energy Gas Holdings, LLC |  |
Deductible loss and credit carryforwards [Line Items] |  |
Deferred Tax Asset | 4 | $ 5
Valuation Allowance | (3) |
Deductible amount | 33 |
Federal |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Deferred tax asset | 118 |
Deductible amount | 560 |
Losses, Valuation allowance | 0 |
Tax credits, Deductible amount | 0 |
Tax credits, Deferred tax asset | 58 |
Tax Credits, Valuation allowance | 0 |
Federal | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Deductible amount | 1 |
Losses, Valuation allowance | 0 |
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, Deductible amount | 0 |
Tax credits, Deferred tax asset | 938 |
Tax Credits, Valuation allowance | 0 |
Federal | Investment Credits | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax credits, Deductible amount | 0 |
Tax credits, Deferred tax asset | 51 |
Tax Credits, Valuation allowance | 0 |
Federal | Federal production credits |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax credits, Deductible amount | 0 |
Tax credits, Deferred tax asset | 129 |
Tax Credits, Valuation allowance | 0 |
Federal | Federal Production And Other Credits [Member] | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax credits, Deductible amount | 0 |
Tax credits, Deferred tax asset | 51 |
Tax Credits, Valuation allowance | 0 |
State |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Deferred tax asset | 103 |
Deductible amount | 1,366 |
Losses, Valuation allowance | (63) |
Tax credits, Deductible amount | 0 |
State minimum tax credits | 90 |
Tax Credits, Valuation allowance | 0 |
State | Dominion Energy Gas Holdings, LLC |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Deferred tax asset | 3 |
Deductible amount | 33 |
Losses, Valuation allowance | (3) |
State | Investment Credits | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax credits, Deductible amount | 0 |
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, Deductible amount | 0 |
Tax credits, Deferred tax asset | 100 |
Tax Credits, Valuation allowance | $ (83) |
Earliest Tax Year [Member] | Federal |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2031 |
Earliest Tax Year [Member] | Federal | Dominion Energy Gas Holdings, LLC |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2032 |
Earliest Tax Year [Member] | Federal | Investment Credits |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2033 |
Earliest Tax Year [Member] | Federal | Investment Credits | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2034 |
Earliest Tax Year [Member] | Federal | Federal production credits |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2031 |
Earliest Tax Year [Member] | Federal | Federal Production And Other Credits [Member] | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2031 |
Earliest Tax Year [Member] | State |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Expiration Period | 2018 |
Earliest Tax Year [Member] | State | Dominion Energy Gas Holdings, LLC |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Expiration Period | 2036 |
Earliest Tax Year [Member] | State | Investment and Other Credit |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2018 |
Latest Tax Year [Member] | Federal |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Expiration Period | 2034 |
Tax Credits, Expiration Period | 2037 |
Latest Tax Year [Member] | Federal | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Expiration Period | 2034 |
Latest Tax Year [Member] | Federal | Dominion Energy Gas Holdings, LLC |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2036 |
Latest Tax Year [Member] | Federal | Investment Credits |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2037 |
Latest Tax Year [Member] | Federal | Investment Credits | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2037 |
Latest Tax Year [Member] | Federal | Federal production credits |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2037 |
Latest Tax Year [Member] | Federal | Federal Production And Other Credits [Member] | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2037 |
Latest Tax Year [Member] | State |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Expiration Period | 2037 |
Latest Tax Year [Member] | State | Dominion Energy Gas Holdings, LLC |  |
Deductible loss and credit carryforwards [Line Items] |  |
Losses, Expiration Period | 2037 |
Latest Tax Year [Member] | State | Investment Credits | Virginia Electric and Power Company |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2024 |
Latest Tax Year [Member] | State | Investment and Other Credit |  |
Deductible loss and credit carryforwards [Line Items] |  |
Tax Credits, Expiration Period | 2027 |

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