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Equity (Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI, including noncontrolling interest | $ (658) | $ (799)
Less other comprehensive income attributable to noncontrolling interest | 1 |
Total AOCI | (659) | (799)
Deferred Gains and Losses on Derivatives-Hedging Activities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (301) | (280)
Amount of tax | 188 | 173
Unrealized Gains and Losses on Investment Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | 747 | 569
Amount of tax | (419) | (318)
Unrecognized Pension and Other Postretirement Benefit Costs |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (1,101) | (1,082)
Amount of tax | 692 | 691
Other Comprehensive Loss From Equity Method Investee |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (3) | (6)
Amount of tax | 2 | 4
Dominion Energy Gas Holdings, LLC |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (98) | (123)
Dominion Energy Gas Holdings, LLC | Deferred Gains and Losses on Derivatives-Hedging Activities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (23) | (24)
Amount of tax | 15 | 15
Dominion Energy Gas Holdings, LLC | Unrecognized Pension and Other Postretirement Benefit Costs |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (75) | (99)
Amount of tax | 59 | 68
Virginia Electric and Power Company |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | 62 | 46
Virginia Electric and Power Company | Deferred Gains and Losses on Derivatives-Hedging Activities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (12) | (8)
Amount of tax | 8 | 5
Virginia Electric and Power Company | Unrealized Gains and Losses on Investment Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | 74 | 54
Amount of tax | $ (47) | $ 35

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