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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [1] | $ 27,253 |  |  |
Total other comprehensive income (loss) |  | 4 |  | $ (7) |
Ending balance |  | 27,365 |  |  |
Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [2] | 22,214 |  |  |
Total other comprehensive income (loss) |  | (5) |  | 3 |
Ending balance |  | 22,692 |  |  |
Total Derivative-Hedging Activities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [3],[4] | (171) |  | (216) |
Other comprehensive income (loss) before reclassifications: gains (losses) | [3],[4] | (16) |  | 7 |
Income tax expense (benefit) | [3],[4] | (2) |  | (4) |
Total, net of tax | [3],[4] | 8 |  | 7 |
Total other comprehensive income (loss) | [3],[4] | (8) |  | 14 |
Ending balance | [3],[4] | (179) |  | (202) |
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [5],[6] | 28 |  | 15 |
Other comprehensive income (loss) before reclassifications: gains (losses) | [5],[6] | (7) |  | 7 |
Income tax expense (benefit) | [6] | 0 | [3] | 0 | [5]
Total, net of tax | [6] | 0 | [3] | 0 | [5]
Total other comprehensive income (loss) | [5],[6] | (7) |  | 7 |
Ending balance | [5],[6] | 21 |  | 22 |
Total Derivative-Hedging Activities | Amounts reclassified from AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges (benefit) | [3],[4] | 10 |  | 11 |
Income (loss) before income tax expense | [3],[4] | 10 |  | 11 |
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income (expense) | [5],[6] |  |  | 0 |
Income (loss) before income tax expense | [6] | 0 | [5] | 0 | [3]
Investment Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [7] | (14) |  | 0 |
Other comprehensive income (loss) before reclassifications: gains (losses) | [7] | 13 |  | (26) |
Income tax expense (benefit) | [7] | 0 |  | (2) |
Total, net of tax | [7] | 2 |  | 6 |
Total other comprehensive income (loss) | [7] | 15 |  | (20) |
Ending balance | [7] | 1 |  | (20) |
Investment Securities | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [8] | (1) |  | 1 |
Other comprehensive income (loss) before reclassifications: gains (losses) | [8] | 2 |  | (5) |
Income tax expense (benefit) | [8] | 0 |  | (1) |
Total, net of tax | [8] | 0 |  | 1 |
Total other comprehensive income (loss) | [8] | 2 |  | (4) |
Ending balance | [8] | 1 |  | (3) |
Investment Securities | Amounts reclassified from AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income (expense) | [7] | 2 |  | 8 |
Income (loss) before income tax expense | [7] | 2 |  | 8 |
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income (expense) | [8] | 0 |  | 2 |
Income (loss) before income tax expense | [8] | 0 |  | 2 |
Pension and Other Postretirement Benefit Costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [9],[10] | 29 |  | 43 |
Other comprehensive income (loss) before reclassifications: gains (losses) | [9],[10] | 0 |  | 0 |
Income tax expense (benefit) | [9],[10] | 0 |  | 3 |
Total, net of tax | [9],[10] | (3) |  | (1) |
Total other comprehensive income (loss) | [9],[10] | (3) |  | (1) |
Ending balance | [9],[10] | 26 |  | 42 |
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income (expense) | [9],[10] | (3) |  | (4) |
Income (loss) before income tax expense | [9],[10] | (3) |  | (4) |
AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (156) |  | (173) |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (3) |  | (19) |
Income tax expense (benefit) |  | (2) |  | (3) |
Total, net of tax |  | 7 |  | 12 |
Total other comprehensive income (loss) |  | 4 |  | (7) |
Ending balance |  | (152) |  | (180) |
AOCI | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | 27 |  | 16 |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (5) |  | 2 |
Income tax expense (benefit) |  | 0 |  | (1) |
Total, net of tax |  | 0 |  | 1 |
Total other comprehensive income (loss) |  | (5) |  | 3 |
Ending balance |  | 22 |  | 19 |
AOCI | Amounts reclassified from AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges (benefit) |  | 10 |  | 11 |
Other income (expense) |  | (1) |  | 4 |
Income (loss) before income tax expense |  | 9 |  | 15 |
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income (expense) |  | 0 |  | 2 |
Income (loss) before income tax expense |  | $ 0 |  | $ 2 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Comprised entirely of interest rate derivative hedging activities.
[4] | Net of $61 million, $58 million, $68 million and $73 million tax at March 31, 2025, December 31, 2024, March 31, 2024 and December 31, 2023, respectively.
[5] | Comprised entirely of interest rate derivative hedging activities.
[6] | Net of $(7) million, $(10) million, $(7) million and $(5) million tax at March 31, 2025, December 31, 2024, March 31, 2024 and December 31, 2023, respectively.
[7] | Net of $— million, $5 million, $6 million and $(2) million tax at March 31, 2025, December 31, 2024, March 31, 2024 and December 31, 2023, respectively.
[8] | Net of $— million, $— million, $1 million and $— million tax at March 31, 2025, December 31, 2024, March 31, 2024 and December 31, 2023, respectively.
[9] | Comprised entirely of prior service cost.
[10] | Net of $(9) million, $(9) million, $(10) million and $(14) million tax at March 31, 2025, December 31, 2024, March 31, 2024 and December 31, 2023, respectively.

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