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Equity (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Electric fuel and other energy related purchases |  | $ (2,938) | $ (2,814) | $ (2,301)
Interest and related charges |  | (1,773) | (1,493) | (1,205)
Other income | [1] | 986 | 1,021 | 358
Income from operations before income tax expense |  | 1,727 | 3,129 | 3,090
Income tax expense |  | 351 | 580 | (30)
Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Electric fuel and other energy related purchases | [2] | (2,178) | (2,318) | (1,909)
Interest and related charges | [2] | (524) | (511) | (494)
Other income |  | 98 | 22 | 76
Income from operations before income tax expense |  | 1,413 | 1,582 | 2,314
Income tax expense |  | 264 | 300 | 774
Dominion Energy Gas Holdings, LLC |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges | [3] | (311) | (174) | (60)
Other income |  | 166 | 89 | 62
Income from operations before income tax expense |  | 802 | 756 | 601
Income tax expense |  | 101 | 124 | (65)
Income from continuing operations including noncontrolling interests |  | 701 | 632 | $ 666
Deferred (gains) and losses on derivatives-hedging activities | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income from operations before income tax expense |  | (83) | 137 |
Income tax expense |  | 21 | (35) |
Income from continuing operations including noncontrolling interests |  | (62) | 102 |
Deferred (gains) and losses on derivatives-hedging activities | Commodity contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Operating revenue |  | (146) | 90 |
Electric fuel and other energy related purchases |  | 3 | (14) |
Deferred (gains) and losses on derivatives-hedging activities | Interest rate contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges |  | 54 | 48 |
Deferred (gains) and losses on derivatives-hedging activities | Foreign currency contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income |  | 6 | 13 |
Deferred (gains) and losses on derivatives-hedging activities | Virginia Electric and Power Company | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income from operations before income tax expense |  | 1 | 1 |
Income from continuing operations including noncontrolling interests |  | 1 | 1 |
Deferred (gains) and losses on derivatives-hedging activities | Virginia Electric and Power Company | Interest rate contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges |  | 1 | 1 |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income from operations before income tax expense |  | 7 | 26 |
Income tax expense |  | (2) | (7) |
Income from continuing operations including noncontrolling interests |  | 5 | 19 |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Commodity contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Operating revenue |  | (4) | 8 |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Interest rate contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges |  | 5 | 5 |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Foreign currency contracts | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income |  | 6 | 13 |
Unrealized (gains) and losses on investment securities | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Realized (gain) loss on sale of securities |  | (5) | 7 |
Income from operations before income tax expense |  | (5) | 7 |
Income tax expense |  | 1 | (2) |
Income from continuing operations including noncontrolling interests |  | (4) | 5 |
Unrealized (gains) and losses on investment securities | Virginia Electric and Power Company | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Realized (gain) loss on sale of securities |  | 2 |  |
Impairment |  | 0 |  |
Income from operations before income tax expense |  | (2) |  |
Income tax expense |  | 1 |  |
Income from continuing operations including noncontrolling interests |  | 1 |  |
Amortization of prior-service costs (credits) | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income |  | 7 | 6 |
Unrecognized pension and other postretirement benefit costs, net of tax |  | 5 | 4 |
Unrecognized pension and other postretirement benefit costs | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income |  | (24) | 21 |
Other income |  |  | 120 |
Unrecognized pension and other postretirement benefit costs, before tax |  | 89 | 99 |
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (23) | (21) |
Unrecognized pension and other postretirement benefit costs, net of tax |  |  | 78 |
Unrecognized pension and other postretirement benefit costs | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income |  | 113 |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 7 | 6 |
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (2) | $ (2) |
Unrecognized pension and other postretirement benefit costs, net of tax |  | $ 66 |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 25 for amounts attributable to affiliates.
[3] | See Note 25 for amounts attributable to related parties.

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