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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | $ (3,607) | $ (3,782) | $ (10,651) | $ (10,506)
Interest and related charges |  | 306 | 370 | 1,136 | 1,133
Other income |  | (281) | (129) | (327) | (526)
Income tax expense (benefit) |  | (110) | (84) | (123) | 161
Income (loss) including noncontrolling interests, net of tax |  | (112) | (947) | (513) | 160
Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue | [1] | (2,248) | (2,264) | (5,983) | (6,167)
Interest and related charges | [1] | 135 | 138 | 398 | 408
Other income |  | (34) | (15) | (34) | (68)
Income from operations before income tax expense |  | (586) | (697) | (825) | (840)
Income tax expense (benefit) |  | 111 | 95 | 140 | 118
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 |  | 251 | (7) | 287 | (77)
Income tax expense (benefit) |  | 63 | 1 | (72) | 19
Income (loss) including noncontrolling interests, net of tax |  | 188 | (6) | 215 | (58)
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Commodity contracts |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | (8) | (34) | (22) | (123)
Purchased gas |  |  | 2 | 3 | 1
Discontinued operations |  |  | (1) | (2) | (4)
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 |  | (23) | 12 | 66 | 35
Discontinued operations |  | 230 | 2 | 236 | 2
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Foreign currency |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Discontinued operations |  | 6 | 12 | 6 | 14
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 |  | (3) | (5) | (21) | (6)
Income from operations before income tax expense |  | (3) | (5) | (21) | (6)
Income tax expense (benefit) |  | 2 | 1 | 6 | 1
Income (loss) including noncontrolling interests, net of tax |  | (1) | (4) | (15) | (5)
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 |  | (1) |  | (3) |
Income from operations before income tax expense |  | (1) |  | (3) |
Income tax expense (benefit) |  | 0 |  | 1 |
Income (loss) including noncontrolling interests, net of tax |  | (1) |  | (2) |
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | (5) | (5) | (16) | (18)
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | 36 | 31 | 97 | 85
Unrecognized pension and other postretirement benefit costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 31 | 26 | 81 | 67
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) |  | (8) | (6) | (21) | (17)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 23 | 20 | 60 | 50
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 | [2] | 188 | (6) | 215 | (58)
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 | [3] | 1 | $ 0 | 1 | $ 1
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 |  | 2 |
Income tax expense (benefit) |  | 0 |  | (1) |
Income (loss) including noncontrolling interests, net of tax |  | 1 |  | 1 |
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 |  | $ 2 |
[1] | See Note 19 for amounts attributable to affiliates.
[2] | See table below for details about these reclassifications.
[3] | See table below for details about these reclassifications. Virginia Power’s reclassifications out of AOCI were immaterial for both the three and nine months ended September 30, 2019

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