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Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions | 12 Months Ended
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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 | 63 |
Deferred Tax Asset | 3 |
Valuation Allowance | (3) |
Federal |  |
Deductible loss and credit carryforwards [Line Items] |  |
Deductible amount | 120 |
Losses, Deferred tax asset | 25 |
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] |  |
Deductible amount | $ 1 |
Losses, Expiration Period | 2034 |
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 | 62 | [1]
Losses, Deferred tax asset | 3 | [1]
Losses, Valuation allowance | (3) | [1]
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 | 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 |  |
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 | 2021 | [1]
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 |
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 |  |
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 | 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 |
[1] | Discontinued operations includes $53 million of deductible loss carryforwards which expire between 2036 and 2038​​​​​​​, and are reflected as a deferred tax asset with an offsetting valuation allowance of $5 million.

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