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Equity (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | $ 27,308 |  |
Interest and related charges |  |  |  | 966 | $ 1,354 | $ 1,377
Income tax expense |  | $ (336) | $ (173) | (68) | (425) | (83)
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  | 985 | 2,673 | 1,328
Total other comprehensive income (loss) |  |  |  | (114) | 259 | 76
Ending balance |  |  | 27,308 | 27,881 | 27,308 |
Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 15,980 | 14,557 | 13,989
Interest and related charges | [1] |  |  | 642 | 534 | 516
Income before income tax expense |  |  |  | 1,406 | 2,109 | 1,250
Income tax expense |  |  |  | (191) | (397) | (229)
Total other comprehensive income (loss) |  |  |  | 50 | 11 | (23)
Ending balance |  |  | 15,980 | 17,245 | 15,980 | 14,557
Commodity |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  |  | (1) |
Total other comprehensive income (loss) |  |  |  |  | 1 |
Ending balance |  |  |  |  |  | (1)
Commodity | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Purchased gas |  |  |  |  | 1 |
Income before income tax expense |  |  |  |  | 1 |
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  |  | 1 |
Interest rate |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | (358) | (418) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | 67 |  |
Total other comprehensive income (loss) |  |  |  | 109 | 60 |
Ending balance |  |  | (358) | (249) | (358) | (418)
Interest rate | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | 60 |  |
Total other comprehensive income (loss) |  |  |  | 61 |  |
Interest rate | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) |  |  |  |  | 15 |
Interest and related charges |  |  |  | 57 | 60 |
Income before income tax expense |  |  |  | 57 | 60 |
Income tax expense |  |  |  | (15) | (15) |
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  | 42 | 45 |
Interest rate | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Interest and related charges |  |  |  | 2 |  |
Income before income tax expense |  |  |  | 2 |  |
Income tax expense |  |  |  | 1 |  |
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  | 1 |  |
Total Derivative-Hedging Activities |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance | [2] |  |  | (358) | (419) |
Other comprehensive income before reclassifications: gains (losses) | [2] |  |  | 67 |  |
Total other comprehensive income (loss) | [2] |  |  | 109 | 61 |
Ending balance | [2] |  | (358) | (249) | (358) | (419)
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance | [3] |  |  | (45) | (60) |
Other comprehensive income before reclassifications: gains (losses) | [3] |  |  | 60 | 13 |
Total other comprehensive income (loss) | [3] |  |  | 61 | 15 |
Ending balance | [3] |  | (45) | (16) | (45) | (60)
Total Derivative-Hedging Activities | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) | [2] |  |  |  | 15 |
Purchased gas | [2] |  |  |  | 1 |
Interest and related charges | [2] |  |  | 57 | 60 |
Income before income tax expense | [2] |  |  | 57 | 61 |
Income tax expense | [2] |  |  | (15) | (15) |
Net Income From Continuing Operations Including Noncontrolling Interests | [2] |  |  | 42 | 46 |
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Interest and related charges | [3] |  |  | 2 | 3 |
Income before income tax expense | [3] |  |  | 2 | 3 |
Income tax expense | [3] |  |  | 1 | 1 |
Net Income From Continuing Operations Including Noncontrolling Interests | [3] |  |  | 1 | 2 |
Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance | [4] |  |  | 37 | 62 |
Other comprehensive income before reclassifications: gains (losses) | [4] |  |  | (100) |  |
Total other comprehensive income (loss) | [4] |  |  | (81) | (25) |
Ending balance | [4] |  | 37 | 44 | 37 | 62
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance | [5] |  |  | 4 | 8 |
Other comprehensive income before reclassifications: gains (losses) | [5] |  |  | (11) | (2) |
Total other comprehensive income (loss) | [5] |  |  | (11) | (4) |
Ending balance | [5] |  | 4 | 7 | 4 | 8
Investment Securities | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) | [4] |  |  |  | (7) |
Other income | [4] |  |  | 25 | (23) |
Income before income tax expense | [4] |  |  | 25 | (23) |
Income tax expense | [4] |  |  | (6) | 5 |
Net Income From Continuing Operations Including Noncontrolling Interests | [4] |  |  | 19 | (18) |
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other income | [5] |  |  |  | (3) |
Income before income tax expense | [5] |  |  |  | (3) |
Income tax expense | [5] |  |  |  | (1) |
Net Income From Continuing Operations Including Noncontrolling Interests | [5] |  |  |  | (2) |
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance | [6] |  |  | (1,133) | (1,359) |
Other comprehensive income before reclassifications: gains (losses) | [6] |  |  | (218) |  |
Total other comprehensive income (loss) | [6] |  |  | (143) | 226 |
Ending balance | [6] |  | (1,133) | (1,276) | (1,133) | (1,359)
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) | [6] |  |  |  | 144 |
Other income | [6] |  |  | 102 | 111 |
Income before income tax expense | [6] |  |  | 102 | 111 |
Income tax expense | [6] |  |  | (27) | (29) |
Net Income From Continuing Operations Including Noncontrolling Interests | [6] |  |  | 75 | 82 |
Equity Method Investees |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | (4) | (1) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | 1 |  |
Total other comprehensive income (loss) |  |  |  | 1 | (3) |
Ending balance |  |  | (4) | (3) | (4) | (1)
Equity Method Investees | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) |  |  |  |  | (3) |
AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | (1,458) | (1,717) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | (250) |  |
Total other comprehensive income (loss) |  |  |  | (114) | 259 | 76
Ending balance |  |  | (1,458) | (1,572) | (1,458) | (1,717)
AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | (41) | (52) | (29)
Other comprehensive income before reclassifications: gains (losses) |  |  |  | 49 | 11 |
Total other comprehensive income (loss) |  |  |  | 50 | 11 | (23)
Ending balance |  |  | (41) | 9 | (41) | (52)
AOCI | Amounts reclassified from AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications: gains (losses) |  |  |  |  | 149 |
Purchased gas |  |  |  |  | 1 |
Interest and related charges |  |  |  | 57 | 60 |
Other income |  |  |  | 127 | 88 |
Income before income tax expense |  |  |  | 184 | 149 |
Income tax expense |  |  |  | (48) | (39) |
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  | 136 | 110 |
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Interest and related charges |  |  |  | 2 | 3 |
Other income |  |  |  |  | (3) |
Income before income tax expense |  |  |  | 2 |  |
Income tax expense |  |  |  | 1 |  |
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  | 1 |  |
Interest Rate | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | (45) | (60) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  |  | 13 |
Total other comprehensive income (loss) |  |  |  |  | 15 |
Ending balance |  |  | $ (45) | $ (16) | (45) | $ (60)
Interest Rate | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Interest and related charges |  |  |  |  | 3 |
Income before income tax expense |  |  |  |  | 3 |
Income tax expense |  |  |  |  | 1 |
Net Income From Continuing Operations Including Noncontrolling Interests |  |  |  |  | $ 2 |
[1] | See Note 25 for amounts attributable to affiliates.
[2] | Net of $83 million, $119 million and $141 million tax at December 31, 2022, 2021 and 2020, respectively.
[3] | Net of $(5) million, $16 million and $21 million tax at December 31, 2022, 2021 and 2020, respectively.
[4] | Net of $13 million, $(10) million and $(21) million tax at December 31, 2022 and 2021 and 2020, respectively.
[5] | Net of $2 million, $(2) million and $(3) million tax at December 31, 2022, 2021 and 2020, respectively.
[6] | Net of $445 million, $396 million and $478 million tax at December 31, 2022 and 2021 and 2020, respectively.

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