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Equity (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  | $ (3,521) | $ (3,607) | $ (3,106) | $ (3,938) | $ (3,895) | $ (3,782) | $ (3,443) | $ (3,281) | $ (14,172) |  | $ (14,401) |  | $ (11,199) |
Interest and related charges |  |  |  |  |  |  |  |  |  |  | 1,377 |  | 1,486 |  | 1,279 |
Income tax expense |  | $ 336 |  |  |  |  |  |  |  |  | 83 |  | 209 |  | 522 |
Income from continuing operations including noncontrolling interests |  |  | (815) | (112) | (869) | 468 | (820) | (947) | 199 | 908 | (1,328) |  | (660) |  | (2,097) |
Other Income |  |  |  |  |  |  |  |  |  |  | (733) |  | (811) |  | (885) |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  | $ (1,780) | $ (2,248) | $ (1,805) | $ (1,930) | $ (1,941) | $ (2,264) | $ (1,938) | $ (1,965) | (7,763) | [1] | (8,108) | [1] | (7,619) | [1]
Interest and related charges | [1] |  |  |  |  |  |  |  |  |  | 516 |  | 524 |  | 511 |
Income from operations before income tax expense |  |  |  |  |  |  |  |  |  |  | (1,250) |  | (1,413) |  | (1,582) |
Income tax expense |  |  |  |  |  |  |  |  |  |  | 229 |  | 264 |  | 300 |
Other Income |  |  |  |  |  |  |  |  |  |  | (80) |  | (98) |  | $ (22) |
(Gains) Losses on Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax | [2] |  |  |  |  |  |  |  |  |  | 227 |  | (62) |  |  |
(Gains) Losses on Cash Flow Hedges | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax | [2] |  |  |  |  |  |  |  |  |  | 2 |  | 1 |  |  |
Amounts reclassified from AOCI | Deferred (Gains) and Losses on Derivatives-Hedging Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations before income tax expense |  |  |  |  |  |  |  |  |  |  | 302 |  | (83) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  | (75) |  | 21 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 227 |  | (62) |  |  |
Amounts reclassified from AOCI | Deferred (Gains) and Losses on Derivatives-Hedging Activities | Commodity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | (25) |  | (142) |  |  |
Purchased gas |  |  |  |  |  |  |  |  |  |  | 4 |  | 3 |  |  |
Discontinued operations |  |  |  |  |  |  |  |  |  |  | (2) |  | (4) |  |  |
Amounts reclassified from AOCI | Deferred (Gains) and Losses on Derivatives-Hedging Activities | Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |  |  |  | 236 |  | 5 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  |  | 83 |  | 49 |  |  |
Amounts reclassified from AOCI | Deferred (Gains) and Losses on Derivatives-Hedging Activities | Foreign currency contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |  |  |  | 6 |  | 6 |  |  |
Amounts reclassified from AOCI | Unrealized (gains) and losses on investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations before income tax expense |  |  |  |  |  |  |  |  |  |  | (24) |  | (5) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  | 6 |  | 1 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (18) |  | (4) |  |  |
Realized (gain) loss on sale of securities |  |  |  |  |  |  |  |  |  |  | (24) |  | (5) |  |  |
Amounts reclassified from AOCI | Unrealized (gains) and losses on investment securities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations before income tax expense |  |  |  |  |  |  |  |  |  |  | (4) |  | (2) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (3) |  | (1) |  |  |
Realized (gain) loss on sale of securities |  |  |  |  |  |  |  |  |  |  | (4) |  | (2) |  |  |
Amounts reclassified from AOCI | Amortization of prior-service costs (credits) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  | (84) |  | (24) |  |  |
Amounts reclassified from AOCI | Amortization of actuarial losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  | 134 |  | 113 |  |  |
Amounts reclassified from AOCI | Unrecognized pension and other postretirement benefit costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  |  |  |  |  |  |  |  |  |  | 50 |  | 89 |  |  |
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  |  |  |  |  |  |  |  | (13) |  | (23) |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  |  |  | 37 |  | 66 |  |  |
Amounts reclassified from AOCI | (Gains) Losses on Cash Flow Hedges | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations before income tax expense |  |  |  |  |  |  |  |  |  |  | 2 |  | 1 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 2 |  | 1 |  |  |
Amounts reclassified from AOCI | (Gains) Losses on Cash Flow Hedges | Interest rate | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  |  | $ 2 |  | $ 1 |  |  |
[1] | See Note 25 for amounts attributable to affiliates.
[2] | See table below for details about these reclassifications.

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