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Equity (Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI, including noncontrolling interest | $ (1,793) |  | $ (1,699)
Less other comprehensive income (loss) attributable to noncontrolling interest | 0 |  | 1
Total AOCI | (1,793) |  | (1,700)
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (407) |  | (234)
Amount of tax |  | $ 135 | 79
Unrealized Gains and Losses on Investment Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | 37 |  | 2
Amount of tax | (13) |  |
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (1,421) |  | (1,465)
Amount of tax | 492 |  | 519
Other Comprehensive Loss From Equity Method Investee |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (2) |  | (2)
Amount of tax | 1 |  |
Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (29) |  | (12)
Virginia Electric and Power Company | Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (34) |  | (13)
Amount of tax |  | $ 11 | 4
Virginia Electric and Power Company | Unrealized Gains and Losses on Investment Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | 5 |  | 1
Amount of tax | (1) |  | 0
Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI, including noncontrolling interest | (188) |  | (169)
Less other comprehensive income (loss) attributable to noncontrolling interest | (1) |  |
Total AOCI | (187) |  | (169)
Dominion Energy Gas Holdings, LLC | Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (82) |  | (25)
Amount of tax | 28 |  | 8
Dominion Energy Gas Holdings, LLC | Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total AOCI | (106) |  | (144)
Amount of tax | $ 41 |  | $ 56

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