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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | $ 27,567 |  |
Total other comprehensive income (loss) |  | 17 | $ 67 | $ 16
Ending balance |  | 27,253 | 27,567 |
Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | 21,657 |  |
Total other comprehensive income (loss) |  | 11 | 7 | 50
Ending balance |  | 22,214 | 21,657 |
Total Derivative-Hedging Activities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [1],[2] | (216) | (249) |
Other comprehensive income before reclassifications: gains (losses) |  | 13 |  |
Total other comprehensive income (loss) | [1],[2] | 45 | 33 |
Ending balance | [1],[2] | (171) | (216) | (249)
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [3],[4] | 15 | 16 |
Other comprehensive income before reclassifications: gains (losses) | [3],[4] | 13 | (1) |
Total other comprehensive income (loss) | [3],[4] | 13 | (1) |
Ending balance | [3],[4] | 28 | 15 | 16
Total Derivative-Hedging Activities | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges | [1],[2] | 43 | 43 |
Income (loss) before income tax expense | [1],[2] | 43 | 43 |
Income tax expense (benefit) | [1],[2] | (11) | (10) |
Total, net of tax | [1],[2] | 32 | 33 |
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],[4] |  | 1 |
Income (loss) before income tax expense | [3],[4] | 0 | 1 |
Income tax expense (benefit) | [3],[4] | 0 | (1) |
Investment Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [5] |  | (44) |
Other comprehensive income before reclassifications: gains (losses) | [5] | (22) | 55 |
Total other comprehensive income (loss) | [5] | (14) | 44 |
Ending balance | [5] | (14) |  | (44)
Investment Securities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [6] | 1 | (7) |
Other comprehensive income before reclassifications: gains (losses) | [6] | (5) | 7 |
Total other comprehensive income (loss) | [6] | (2) | 8 |
Ending balance | [6] | (1) | 1 | (7)
Investment Securities | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other income (expense) | [5] | 11 | (14) |
Income (loss) before income tax expense | [5] | 11 | (14) |
Income tax expense (benefit) | [5] | (3) | 3 |
Total, net of tax | [5] | 8 | (11) |
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other income (expense) | [6] | 4 | 1 |
Income (loss) before income tax expense | [6] | 4 | 1 |
Income tax expense (benefit) | [6] | (1) |  |
Total, net of tax | [6] | 3 | 1 |
Pension and Other Postretirement Benefit Costs |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [7],[8] | 43 | 56 |
Other comprehensive income before reclassifications: gains (losses) | [7],[8] | (2) | 0 |
Total other comprehensive income (loss) | [7],[8] | (14) | (13) |
Ending balance | [7],[8] | 29 | 43 | 56
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other income (expense) | [7],[8] | (16) | (18) |
Income (loss) before income tax expense | [7],[8] | (16) | (18) |
Income tax expense (benefit) | [7],[8] | 4 | 5 |
Total, net of tax | [7],[8] | (12) | (13) |
Equity Method Investees |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [9] |  | (3) |
Discontinued operations | [9] |  | 4 |
Total other comprehensive income (loss) | [9] |  | 3 |
Ending balance | [9] |  |  | (3)
Equity Method Investees | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Income (loss) before income tax expense | [9] |  | 4 |
Income tax expense (benefit) | [9] |  | (1) |
Total, net of tax | [9] |  | 3 |
AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | (173) | (240) |
Other comprehensive income before reclassifications: gains (losses) |  | (11) | 55 |
Discontinued operations |  |  | 4 |
Total other comprehensive income (loss) |  | 17 | 67 | 16
Ending balance |  | (156) | (173) | (240)
AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | 16 | 9 |
Other comprehensive income before reclassifications: gains (losses) |  | 8 | 6 |
Total other comprehensive income (loss) |  | 11 | 7 | 50
Ending balance |  | 27 | 16 | $ 9
AOCI | Amounts reclassified from AOCI |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges |  |  | 43 |
Other income (expense) |  | (5) | (32) |
Income (loss) before income tax expense |  | 38 | 15 |
Income tax expense (benefit) |  | (10) | (3) |
Total, net of tax |  | 28 | 12 |
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Interest and related charges |  |  | 1 |
Other income (expense) |  | 4 | 1 |
Income (loss) before income tax expense |  | 4 | 2 |
Income tax expense (benefit) |  | (1) | (1) |
Total, net of tax |  | $ 3 | $ 1 |
[1] | Comprised entirely of interest rate derivative hedging activities.
[2] | Net of $58 million, $73 million and $83 million tax at December 31, 2024, 2023 and 2022, respectively.
[3] | Comprised entirely of interest rate derivative hedging activities.
[4] | Net of $(10) million, $(5) million and $(5) million tax at December 31, 2024, 2023 and 2022, respectively.
[5] | Net of $5 million, $(2) million and $13 million tax at December 31, 2024, 2023 and 2022, respectively.
[6] | Net of $— million, $— million and $2 million tax at December 31, 2024, 2023 and 2022, respectively.
[7] | Comprised entirely of prior service cost. See Note 22 for additional information.
[8] | Net of $(9) million, $(14) million and $(19) million tax at December 31, 2024, 2023 and 2022, respectively.
[9] | Net of $— million and $1 million tax at December 31, 2023 and 2022, respectively.

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