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Equity (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | $ 27,659 |  |
Total other comprehensive income |  | 66 | $ (114) | $ 259
Ending balance |  | 27,529 | 27,659 |
Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | 16,949 | 15,787 | 14,557
Total other comprehensive income |  | 7 | 50 | 11
Ending balance |  | 21,657 | 16,949 | 15,787
Total Derivative-Hedging Activities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [1],[2] | (249) | (358) |
Other comprehensive income before reclassifications: gains (losses) | [1],[2] |  | 67 |
Total other comprehensive income | [1],[2] | 33 | 109 |
Ending balance | [1],[2] | (216) | (249) | (358)
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [1],[3] | 16 | (45) |
Other comprehensive income before reclassifications: gains (losses) | [1],[3] | (1) | 60 |
Income (loss) before income tax expense | [1],[3] | 1 |  |
Total other comprehensive income | [1],[3] |  | 61 |
Ending balance | [1],[3] | 15 | 16 | (45)
Total Derivative-Hedging Activities | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges | [1],[2] | 43 | 57 |
Income (loss) before income tax expense | [1],[2] | 43 | 57 |
Income tax expense (benefit) | [1],[2] | 10 | (15) |
Total, net of tax | [1],[2] | 33 | 42 |
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges | [1],[3] | 1 | 2 |
Income (loss) before income tax expense | [1],[3] |  | 2 |
Income tax expense (benefit) | [1],[3] | 1 | 1 |
Total, net of tax | [1],[3] |  | 1 |
Total other comprehensive income | [1],[3] | (1) |  |
Investment Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [4] | (44) | 37 |
Other comprehensive income before reclassifications: gains (losses) | [4] | 55 | 100 |
Total other comprehensive income | [4] | 44 | (81) |
Ending balance | [4] |  | (44) | 37
Investment Securities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [5] | (7) | 4 |
Other comprehensive income before reclassifications: gains (losses) | [5] | 7 | (11) |
Income (loss) before income tax expense | [5] | 1 |  |
Total, net of tax | [5] | 1 |  |
Total other comprehensive income | [5] | 8 | (11) |
Ending balance | [5] | (1) | (7) | 4
Investment Securities | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other income (expense) | [4] | (14) | 25 |
Income (loss) before income tax expense | [4] | (14) | 25 |
Income tax expense (benefit) | [4] | (3) | (6) |
Total, net of tax | [4] | (11) | 19 |
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other income (expense) | [5] | 1 |  |
Pension and Other Postretirement Benefit Costs |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [6] | (1,276) | (1,133) |
Other comprehensive income before reclassifications: gains (losses) | [6] | 27 | (218) |
Total other comprehensive income | [6] | (14) | (143) |
Ending balance | [6] | (1,290) | (1,276) | (1,133)
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other income (expense) | [6] | (61) | 102 |
Income (loss) before income tax expense | [6] | (61) | 102 |
Income tax expense (benefit) | [6] | (20) | (27) |
Total, net of tax | [6] | (41) | 75 |
Equity Method Investees |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [7] | (3) | (4) |
Other comprehensive income before reclassifications: gains (losses) | [7] |  | 1 |
Total other comprehensive income | [7] | 3 | 1 |
Ending balance | [7] |  | (3) | (4)
Equity Method Investees | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Discontinued operations | [7] | 4 |  |
Income (loss) before income tax expense | [7] | 4 |  |
Income tax expense (benefit) | [7] | 1 |  |
Total, net of tax | [7] | 3 |  |
AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | (1,572) | (1,458) |
Other comprehensive income before reclassifications: gains (losses) |  | 82 | (250) |
Total other comprehensive income |  | 66 | (114) | 259
Ending balance |  | (1,506) | (1,572) | (1,458)
AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | 9 | (41) | (52)
Other comprehensive income before reclassifications: gains (losses) |  | 6 | 49 |
Income (loss) before income tax expense |  | 2 |  |
Income tax expense (benefit) |  | (1) |  |
Total, net of tax |  | 1 |  |
Total other comprehensive income |  | 7 | 50 | 11
Ending balance |  | 16 | 9 | $ (41)
AOCI | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges |  | 43 | 57 |
Other income (expense) |  | (75) | 127 |
Discontinued operations |  | 4 |  |
Income (loss) before income tax expense |  | (28) | 184 |
Income tax expense (benefit) |  | (12) | (48) |
Total, net of tax |  | (16) | 136 |
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges |  | 1 | 2 |
Other income (expense) |  | $ 1 |  |
Income (loss) before income tax expense |  |  | 2 |
Total, net of tax |  |  | $ 1 |
[1] | Comprised entirely of interest rate derivative hedging activities.
[2] | Net of $7 3 million, $83 million and $119 million tax at December 31, 2023, 2022 and 2021, respectively.
[3] | Net of $(5) million, $(5) million and $16 million tax at December 31, 2023, 2022 and 2021, respectively.
[4] | Net of $(2) million, $13 million and $(10) million tax at December 31, 2023 and 2022 and 2021, respectively.
[5] | Net of $— million, $2 million and $(2) million tax at December 31, 2023, 2022 and 2021, respectively.
[6] | Net of $456 million, $445 million and $396 million tax at December 31, 2023 and 2022 and 2021, respectively.
[7] | Net of $— million, $1 million, and $1 million tax at December 31, 2023, 2022 and 2021, respectively.

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