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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  |  |  | $ 27,529 |  |  |
Total other comprehensive income (loss) |  | $ 33 |  | $ 1 |  | (148) |  | $ 7 |
Ending balance |  | 27,531 |  |  |  | 27,531 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 22,359 |  | 17,638 |  | 21,657 | [2] | 16,949 |
Income before income tax expense |  | 795 |  | 603 |  | 1,984 |  | 1,475 |
Total other comprehensive income (loss) |  | (2) |  | 15 |  | 5 |  | 15 |
Ending balance |  | 23,010 |  | 18,128 |  | 23,010 |  | 18,128 |
Total Derivative-Hedging Activities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (191) | [3],[4] | (236) | [3],[4] | (216) | [5],[6] | (249) | [5],[6]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (7) | [3],[4] | 19 | [3],[4] | 2 | [5],[6] | 16 | [5],[6]
Income tax expense (benefit) |  | (3) | [3],[4] | (3) | [3],[4] | (9) | [5],[6] | (8) | [5],[6]
Total, net of tax |  | 8 | [3],[4] | 8 | [3],[4] | 24 | [5],[6] | 24 | [5],[6]
Total other comprehensive income (loss) |  | 1 | [3],[4] | 27 | [3],[4] | 26 | [5],[6] | 40 | [5],[6]
Ending balance | [3],[4],[6] | (190) |  | (209) |  | (190) |  | (209) |
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 24 | [7],[8] | 13 | [7],[8] | 15 | [9],[10] | 16 | [9],[10]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (7) | [7],[8] | 18 | [7],[8] | 2 | [9],[10] | 15 | [9],[10]
Interest and related charges (benefit) | [7],[8] | 0 |  |  |  |  |  |  |
Income tax expense (benefit) |  | 0 | [7],[8] | (1) | [3],[8] | 0 | [9],[10] | (1) | [9],[10]
Total, net of tax |  | 0 | [3],[8] | 0 | [7],[8] | 0 | [9],[10] | 0 | [9],[10]
Total other comprehensive income (loss) |  | (7) | [7],[8] | 18 | [7],[8] | 2 | [9],[10] | 15 | [9],[10]
Ending balance | [7],[8],[10] | 17 |  | 31 |  | 17 |  | 31 |
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 11 | [3],[4] | 11 | [3],[4] | 33 | [5],[6] | 32 | [5],[6]
Discontinued operations |  |  |  | 0 | [3],[4] |  |  | 0 | [5],[6]
Income (loss) before income tax expense |  | 11 | [3],[4] | 11 | [3],[4] | 33 | [5],[6] | 32 | [5],[6]
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  |  |  | 1 | [7],[8] |  |  | 1 | [9],[10]
Income (loss) before income tax expense |  | 0 | [7],[8] | 1 | [3],[8] | 0 | [9],[10] | 1 | [9],[10]
Investment Securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (13) | [11] | (29) | [11] | 0 | [12] | (44) | [12]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 32 | [11] | (22) | [11] | 13 | [12] | (6) | [12]
Income tax expense (benefit) |  | 1 | [11] | 0 | [11] | (1) | [12] | 0 | [12]
Total, net of tax |  | (1) | [11] | 2 | [11] | 5 | [12] | 1 | [12]
Total other comprehensive income (loss) |  | 31 | [11] | (20) | [11] | 18 | [12] | (5) | [12]
Ending balance | [11],[12] | 18 |  | (49) |  | 18 |  | (49) |
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (1) | [13] | (4) | [13] | 1 | [14] | (7) | [14]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 6 | [13] | (3) | [13] | 2 | [14] | 0 | [14]
Income tax expense (benefit) |  | (1) | [13] | 0 | [13] | (1) | [14] | 0 | [14]
Total, net of tax |  | (1) | [13] | 0 | [13] | 1 | [14] | 0 | [14]
Total other comprehensive income (loss) |  | 5 | [13] | (3) | [13] | 3 | [14] | 0 | [14]
Ending balance | [13],[14] | 4 |  | (7) |  | 4 |  | (7) |
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Discontinued operations |  |  |  | 0 | [11] |  |  | 0 | [12]
Other income (expense) |  | (2) | [11] | 2 | [11] | 6 | [12] | 1 | [12]
Income (loss) before income tax expense |  | (2) | [11] | 2 | [11] | 6 | [12] | 1 | [12]
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income (expense) |  | 0 | [13] | 0 | [13] | 2 | [14] | 0 | [14]
Income (loss) before income tax expense |  | 0 | [13] | 0 | [13] | 2 | [14] | 0 | [14]
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,483) | [15] | (1,299) | [15] | (1,290) | [16] | (1,276) | [16]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 4 | [15] | 0 | [15] | (249) | [16] | 0 | [16]
Income tax expense (benefit) |  | 1 | [15] | 7 | [15] | (20) | [16] | 15 | [16]
Total, net of tax |  | (3) | [15] | (8) | [15] | 57 | [16] | (31) | [16]
Total other comprehensive income (loss) |  | 1 | [15] | (8) | [15] | (192) | [16] | (31) | [16]
Ending balance | [15],[16] | (1,482) |  | (1,307) |  | (1,482) |  | (1,307) |
Pension and Other Postretirement Benefit Costs | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Discontinued operations |  |  |  | 0 | [15] |  |  | 0 | [16]
Other income (expense) |  | (4) | [15] | (15) | [15] | 77 | [16] | (46) | [16]
Income (loss) before income tax expense |  | (4) | [15] | (15) | [15] | 77 | [16] | (46) | [16]
Equity Method Investees |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 0 | [17] | (2) | [17] | 0 | [18] | (3) | [18]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 0 | [17] | (1) | [17] | 0 | [18] | 0 | [18]
Income tax expense (benefit) |  | 0 | [17] | (1) | [17] | 0 | [18] | (1) | [18]
Total, net of tax |  | 0 | [17] | 3 | [17] | 0 | [18] | 3 | [18]
Total other comprehensive income (loss) |  | 0 | [17] | 2 | [17] | 0 | [18] | 3 | [18]
Ending balance | [17],[18] | 0 |  | 0 |  | 0 |  | 0 |
Equity Method Investees | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Discontinued operations |  |  |  | 4 | [17] |  |  | 4 | [18]
Other income (expense) |  | 0 | [17] | 0 | [17] | 0 | [18] | 0 | [18]
Income (loss) before income tax expense |  | 0 | [17] | 4 | [17] | 0 | [18] | 4 | [18]
AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,687) |  | (1,566) |  | (1,506) |  | (1,572) |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 29 |  | (4) |  | (234) |  | 10 |
Income tax expense (benefit) |  | (1) |  | 3 |  | (30) |  | 6 |
Total, net of tax |  | 4 |  | 5 |  | 86 |  | (3) |
Total other comprehensive income (loss) |  | 33 |  | 1 |  | (148) |  | 7 |
Ending balance |  | (1,654) |  | (1,565) |  | (1,654) |  | (1,565) |
AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 23 |  | 9 |  | 16 |  | 9 |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (1) |  | 15 |  | 4 |  | 15 |
Income tax expense (benefit) |  | (1) |  | (1) |  | (1) |  | (1) |
Total, net of tax |  | (1) |  | 0 |  | 1 |  | 0 |
Total other comprehensive income (loss) |  | (2) |  | 15 |  | 5 |  | 15 |
Ending balance |  | 21 |  | 24 |  | 21 |  | 24 |
AOCI | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 11 |  | 11 |  | 33 |  | 32 |
Discontinued operations |  |  |  | 4 |  |  |  | 4 |
Other income (expense) |  | (6) |  | (13) |  | 83 |  | (45) |
Income (loss) before income tax expense |  | 5 |  | 2 |  | 116 |  | (9) |
AOCI | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 0 |  | 1 |  |  |  | 1 |
Other income (expense) |  | 0 |  | 0 |  | 2 |  | 0 |
Income (loss) before income tax expense |  | $ 0 |  | $ 1 |  | $ 2 |  | $ 1 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Comprised entirely of interest rate derivative hedging activities.
[4] | Net of $64 million, $64 million, $70 million and $79 million tax at September 30, 2024, June 30, 2024, September 30, 2023 and June 30, 2023, respectively.
[5] | Comprised entirely of interest rate derivative hedging activities.
[6] | Net of $64 million, $73 million, $70 million and $83 million tax at September 30, 2024, December 31, 2023, September 30, 2023 and December 31, 2022, respectively.
[7] | Comprised entirely of interest rate derivative hedging activities.
[8] | Net of $(6) million, $(8) million, $(11) million and $(4) million tax at September 30, 2024, June 30, 2024, September 30, 2023 and June 30, 2023, respectively.
[9] | Comprised entirely of interest rate derivative hedging activities.
[10] | Net of $(6) million, $(5) million, $(11) million and $(5) million tax at September 30, 2024, December 31, 2023, September 30, 2023 and December 31, 2022, respectively.
[11] | Net of $(5) million, $3 million, $16 million and $9 million tax at September 30, 2024, June 30, 2024, September 30, 2023 and June 30, 2023, respectively.
[12] | Net of $(5) million, $(2) million, $16 million and $13 million tax at September 30, 2024, December 31, 2023, September 30, 2023 and December 31, 2022, respectively.
[13] | Net of $(2) million, $— million, $3 million and $1 million tax at September 30, 2024, June 30, 2024, September 30, 2023 and June 30, 2023, respectively.
[14] | Net of $(2) million, $— million, $3 million and $2 million tax at September 30, 2024, December 31, 2023, September 30, 2023 and December 31, 2022, respectively.
[15] | Net of $522 million, $522 million, $461 million and $453 million tax at September 30, 2024, June 30, 2024, September 30, 2023 and June 30, 2023, respectively.
[16] | Net of $522 million, $456 million, $461 million and $445 million tax at September 30, 2024, December 31, 2023, September 30, 2023 and December 31, 2022, respectively.
[17] | Net of $— million tax at September 30, 2024, June 30, 2024, September 30, 2023 and June 30, 2023, respectively.
[18] | Net of $— million tax at September 30, 2024, December 31, 2023, September 30, 2023 and $1 million tax at December 31, 2022, respectively.

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