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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  |  |  | $ 26,863 |  |  |
Total other comprehensive income (loss) |  | $ 6 |  | $ 24 |  | 13 |  | $ 32 |
Ending balance |  | 27,691 |  |  |  | 27,691 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | [2] |  |  |  |  | 22,157 |  |  |
Total other comprehensive income (loss) |  | (1) |  | (3) |  | (6) |  | 4 |
Ending balance |  | 27,333 |  |  |  | 27,333 |  |  |
Total Derivative-Hedging Activities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (172) | [3],[4] | (191) | [3],[4] | (171) | [5],[6] | (216) | [5],[6]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (3) | [3],[4] | (7) | [3],[4] | (19) | [5],[6] | 2 | [5],[6]
Income tax expense (benefit) |  | (3) | [3],[4] | (3) | [3],[4] | (8) | [5],[6] | (9) | [5],[6]
Total, net of tax |  | 7 | [3],[4] | 8 | [3],[4] | 22 | [5],[6] | 24 | [5],[6]
Total other comprehensive income (loss) |  | 4 | [3],[4] | 1 | [3],[4] | 3 | [5],[6] | 26 | [5],[6]
Ending balance | [3],[4],[6] | (168) |  | (190) |  | (168) |  | (190) |
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 23 | [7],[8] | 24 | [7],[8] | 28 | [9],[10] | 15 | [9],[10]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (2) | [7],[8] | (7) | [7],[8] | (7) | [9],[10] | 2 | [9],[10]
Income tax expense (benefit) |  | 0 | [7],[8] | 0 | [7],[8] | 0 | [9],[10] | 0 | [9],[10]
Total, net of tax |  | 0 | [7],[8] | 0 | [7],[8] | 0 | [9],[10] | 0 | [9],[10]
Total other comprehensive income (loss) |  | (2) | [7],[8] | (7) | [7],[8] | (7) | [9],[10] | 2 | [9],[10]
Ending balance | [7],[8],[10] | 21 |  | 17 |  | 21 |  | 17 |
Total Derivative-Hedging Activities | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 10 | [3],[4] | 11 | [3],[4] | 30 | [5],[6] | 33 | [5],[6]
Other income (expense) |  | 0 | [3],[4] | 0 | [3],[4] | 0 | [5],[6] | 0 | [5],[6]
Income (loss) before income tax expense |  | 10 | [3],[4] | 11 | [3],[4] | 30 | [5],[6] | 33 | [5],[6]
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income (expense) | [9],[10] |  |  |  |  |  |  | 0 |
Income (loss) before income tax expense |  | 0 | [7],[8] | 0 | [7],[8] | 0 | [9],[10] | 0 | [9],[10]
Investment Securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 3 | [11] | (10) | [11] | (10) | [12] | 1 | [12]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 6 | [11] | 27 | [11] | 15 | [12] | 10 | [12]
Income tax expense (benefit) |  | (0) | [11] | 1 | [11] | (1) | [12] | (1) | [12]
Total, net of tax |  | (1) | [11] | (1) | [11] | 3 | [12] | 5 | [12]
Total other comprehensive income (loss) |  | 5 | [11] | 26 | [11] | 18 | [12] | 15 | [12]
Ending balance | [11],[12] | 8 |  | 16 |  | 8 |  | 16 |
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 0 | [13] | (0) | [13] | 0 | [14] | 2 | [14]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 1 | [13] | 5 | [13] | 1 | [14] | 1 | [14]
Income tax expense (benefit) |  | 0 | [13] | (1) | [13] | 0 | [14] | (1) | [14]
Total, net of tax |  | 0 | [13] | (1) | [13] | 0 | [14] | (1) | [14]
Total other comprehensive income (loss) |  | 1 | [13] | 4 | [13] | 1 | [14] | 2 | [14]
Ending balance | [13],[14] | 1 |  | 4 |  | 1 |  | 4 |
Investment Securities | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 0 | [11] | 0 | [11] | 0 | [12] | 0 | [12]
Other income (expense) |  | (1) | [11] | (2) | [11] | 4 | [12] | 6 | [12]
Income (loss) before income tax expense |  | (1) | [11] | (2) | [11] | 4 | [12] | 6 | [12]
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income (expense) | [14] |  |  |  |  |  |  | 2 |
Income (loss) before income tax expense |  | 0 | [13] | 0 | [13] | 0 | [14] | 2 | [14]
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 24 | [15],[16] | 37 | [15],[16] | 29 | [17],[18] | 43 | [17],[18]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 0 | [15],[16] | 0 | [15],[16] | 0 | [17],[18] | 0 | [17],[18]
Income tax expense (benefit) |  | 0 | [15],[16] | 1 | [15],[16] | 1 | [17],[18] | 4 | [17],[18]
Total, net of tax |  | (3) | [15],[16] | (3) | [15],[16] | (8) | [17],[18] | (9) | [17],[18]
Total other comprehensive income (loss) |  | (3) | [15],[16] | (3) | [15],[16] | (8) | [17],[18] | (9) | [17],[18]
Ending balance | [15],[16],[18] | 21 |  | 34 |  | 21 |  | 34 |
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 0 | [15],[16] | 0 | [15],[16] | 0 | [17],[18] | 0 | [17],[18]
Other income (expense) |  | (3) | [15],[16] | (4) | [15],[16] | (9) | [17],[18] | (13) | [17],[18]
Income (loss) before income tax expense |  | (3) | [15],[16] | (4) | [15],[16] | (9) | [17],[18] | (13) | [17],[18]
AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (145) |  | (164) |  | (152) |  | (172) |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 3 |  | 20 |  | (4) |  | 12 |
Income tax expense (benefit) |  | (3) |  | (1) |  | (8) |  | (6) |
Total, net of tax |  | 3 |  | 4 |  | 17 |  | 20 |
Total other comprehensive income (loss) |  | 6 |  | 24 |  | 13 |  | 32 |
Ending balance |  | (139) |  | (140) |  | (139) |  | (140) |
AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 23 |  | 24 |  | 28 |  | 17 |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (1) |  | (2) |  | (6) |  | 3 |
Income tax expense (benefit) |  | 0 |  | (1) |  | 0 |  | (1) |
Total, net of tax |  | 0 |  | (1) |  | 0 |  | 1 |
Total other comprehensive income (loss) |  | (1) |  | (3) |  | (6) |  | 4 |
Ending balance |  | 22 |  | 21 |  | 22 |  | 21 |
AOCI | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Interest and related charges (benefit) |  | 10 |  | 11 |  | 30 |  | 33 |
Other income (expense) |  | (4) |  | (6) |  | (5) |  | (7) |
Income (loss) before income tax expense |  | 6 |  | 5 |  | 25 |  | 26 |
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  | 2 |
Income (loss) before income tax expense |  | $ 0 |  | $ 0 |  | $ 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 $57 million, $58 million, $64 million and $64 million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[5] | Comprised entirely of interest rate derivative hedging activities.
[6] | Net of $57 million, $58 million, $64 million and $73 million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[7] | Comprised entirely of interest rate derivative hedging activities.
[8] | Net of $(7) million, $(8) million, $(6) million and $(8) million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[9] | Comprised entirely of interest rate derivative hedging activities.
[10] | Net of $(7) million, $(10) million, $(6) million and $(5) million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[11] | Net of $(5) million, $— million, $(8) million and $6 million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[12] | Net of $(5) million, $9 million, $(8) million and $(1) million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[13] | Net of $— million, $1 million, $(2) million and $1 million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[14] | Net of $— million, $1 million, $(2) million and $1 million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[15] | Comprised entirely of prior service cost.
[16] | Net of $(7) million, $(8) million, $(10) million and $(11) million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[17] | Comprised entirely of prior service cost.
[18] | Net of $(7) million, $(9) million, $(10) million and $(14) million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.

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