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Equity (Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI, including noncontrolling interest | $ (1,699) | $ (658)
Less other comprehensive income attributable to noncontrolling interest | 1 | 1
Total AOCI | (1,700) | (659)
Deferred Gains and Losses on Derivatives-Hedging Activities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (234) | (301)
Amount of tax | 79 | 188
Unrealized Gains and Losses on Investment Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | 2 | 747
Amount of tax |  | (419)
Unrecognized Pension and Other Postretirement Benefit Costs |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (1,465) | (1,101)
Amount of tax | 519 | 692
Other Comprehensive Loss From Equity Method Investee |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (2) | (3)
Amount of tax |  | 2
Virginia Electric and Power Company |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (12) | 62
Virginia Electric and Power Company | Deferred Gains and Losses on Derivatives-Hedging Activities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (13) | (12)
Amount of tax | 4 | 8
Virginia Electric and Power Company | Unrealized Gains and Losses on Investment Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | 1 | 74
Amount of tax |  | (47)
Dominion Energy Gas Holdings, LLC |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (169) | (98)
Dominion Energy Gas Holdings, LLC | Deferred Gains and Losses on Derivatives-Hedging Activities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (25) | (23)
Amount of tax | 8 | 15
Dominion Energy Gas Holdings, LLC | Unrecognized Pension and Other Postretirement Benefit Costs |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total AOCI | (144) | (75)
Amount of tax | $ 56 | $ 59

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