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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | [1] | $ (3,585) |  | $ (3,970) |  | $ (8,081) |  | $ (7,828) |
Interest and related charges |  | 449 |  | 452 |  | 939 |  | 921 |
Other income |  | (502) |  | (53) |  | (50) |  | (400) |
Income tax expense (benefit) |  | (556) |  | 43 |  | (575) |  | 157 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | [2] | (1,805) |  | (1,938) |  | (3,735) |  | (3,903) |
Interest and related charges | [2] | 137 |  | 135 |  | 263 |  | 270 |
Other income |  | (52) |  | (16) |  | 0 |  | (53) |
Income from operations before income tax expense |  | (550) |  | (119) |  | (239) |  | (143) |
Income tax expense (benefit) |  | 60 |  | 19 |  | 29 |  | 23 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | [3] | (510) |  | (530) |  | (1,066) |  | (1,096) |
Interest and related charges | [3] | 50 |  | 86 |  | 108 |  | 173 |
Other income | [3] | (46) |  | (44) |  | (95) |  | (85) |
Income tax expense (benefit) |  | (82) |  | 23 |  | (30) |  | 66 |
Income (loss) including noncontrolling interests, net of tax |  | 166 |  | (123) |  | (36) |  | (295) |
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 |  | 7 |  | (29) |  | 36 |  | (70) |
Income tax expense (benefit) |  | (2) |  | 8 |  | (9) |  | 18 |
Income (loss) including noncontrolling interests, net of tax |  | 5 |  | (21) |  | 27 |  | (52) |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Income from operations before income tax expense |  | (2) |  | (2) |  | 6 |  | 1 |
Income tax expense (benefit) |  | 0 |  | 0 |  | (2) |  | 0 |
Income (loss) including noncontrolling interests, net of tax |  | (2) |  | (2) |  | 4 |  | 1 |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Commodity contracts |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  | (9) |  | (38) |  | (16) |  | (92) |
Purchased gas |  |  |  |  |  | 3 |  | (3) |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Commodity contracts | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  | (2) |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges |  | 22 |  | 13 |  | 49 |  | 23 |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges |  | 4 |  | 2 |  | 6 |  | 1 |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Foreign currency |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income |  | (6) |  | (4) |  |  |  | 2 |
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income |  | (6) |  | (4) |  |  |  | 2 |
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Realized (gains) losses on sale of securities |  | (5) |  | (1) |  | (18) |  | (1) |
Income from operations before income tax expense |  | (5) |  | (1) |  | (18) |  | (1) |
Income tax expense (benefit) |  | 0 |  | 0 |  | 4 |  | 0 |
Income (loss) including noncontrolling interests, net of tax |  | (5) |  | (1) |  | (14) |  | (1) |
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Realized (gains) losses on sale of securities |  | (4) |  |  |  | (2) |  |  |
Income from operations before income tax expense |  | (4) |  |  |  | (2) |  |  |
Income tax expense (benefit) |  | 2 |  |  |  | 1 |  |  |
Income (loss) including noncontrolling interests, net of tax |  | (2) |  |  |  | (1) |  |  |
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income |  | (5) |  | (8) |  | (11) |  | (13) |
Amortization of actuarial losses | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 2 |  | 2 |  | 4 |  | 4 |
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) |  | 0 |  | 0 |  | (1) |  | (1) |
Unrecognized pension and other postretirement benefit costs, net of tax |  | 2 |  | 2 |  | 3 |  | 3 |
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income |  | 31 |  | 27 |  | 61 |  | 54 |
Amortization of actuarial losses | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income |  | 2 |  | 2 |  | 4 |  | 4 |
Unrecognized pension and other postretirement benefit costs |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 26 |  | 19 |  | 50 |  | 41 |
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) |  | (8) |  | 3 |  | (13) |  | (11) |
Unrecognized pension and other postretirement benefit costs, net of tax |  | 18 |  | 22 |  | 37 |  | 30 |
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax | [4] | 5 |  | (21) |  | 27 |  | (52) |
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax | [5] | 0 |  | 1 |  | 0 |  | 1 |
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax |  | (2) | [4] | $ (2) | [4] | 4 | [6] | $ 1 | [6]
Deferred Gains and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Income from operations before income tax expense |  | 1 |  |  |  | 1 |  |  |
Income tax expense (benefit) |  | (1) |  |  |  | (1) |  |  |
Income (loss) including noncontrolling interests, net of tax |  | 0 |  |  |  | 0 |  |  |
Deferred Gains and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges |  | $ 1 |  |  |  | $ 1 |  |  |
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 19 for amounts attributable to affiliates.
[3] | See Note 19 for amounts attributable to related parties.
[4] | See table below for details about these reclassifications.
[5] | See table below for details about these reclassifications. Virginia Power’s reclassifications out of AOCI were immaterial for both the three and six months ended June 30, 2019
[6] | See table below for details about these reclassifications

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