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Significant Accounting Policies (Schedule of Revision of Previously Issued Consolidated Statements of Equity) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | $ 30,872 | $ 26,717 | $ 29,802 | [1] | $ 27,264
Net income including noncontrolling interests | 1,028 | 934 | 2,553 |  | 1,900
Other comprehensive income (loss), net of tax | 6 | 24 | 13 |  | 32
Ending balance | 31,726 | 27,146 | 31,726 |  | 27,146
Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 1,906 | 1,724 | 1,641 |  | 1,925
Net income including noncontrolling interests | 1,006 | 934 | 2,431 |  | 1,900
Ending balance | 2,333 | 2,084 | 2,333 |  | 2,084
Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | (145) | (164) | (152) |  | (172)
Other comprehensive income (loss), net of tax | 6 | 24 | 13 |  | 32
Ending balance | (139) | (140) | (139) |  | (140)
Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 27,215 | 26,717 | 26,863 |  | 27,264
Net income including noncontrolling interests | 1,006 | 934 | 2,431 |  | 1,900
Other comprehensive income (loss), net of tax | 6 | 24 | 13 |  | 32
Ending balance | 27,691 | 27,146 | 27,691 |  | 27,146
As Previously Reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 27,073 | 30,192 |  | 27,567
Net income including noncontrolling interests |  | 958 |  |  | 1,979
Other comprehensive income (loss), net of tax |  | 29 |  |  | 35
Ending balance |  | 27,531 |  |  | 27,531
As Previously Reported | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 2,083 |  |  | 2,229
Net income including noncontrolling interests |  | 958 |  |  | 1,979
Ending balance |  | 2,467 |  |  | 2,467
As Previously Reported | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (167) |  |  | (173)
Other comprehensive income (loss), net of tax |  | 29 |  |  | 35
Ending balance |  | (138) |  |  | (138)
As Previously Reported | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 27,073 |  |  | 27,567
Net income including noncontrolling interests |  | 958 |  |  | 1,979
Other comprehensive income (loss), net of tax |  | 29 |  |  | 35
Ending balance |  | 27,531 |  |  | 27,531
Adjustments |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (356) | (390) |  | (303)
Net income including noncontrolling interests |  | (24) |  |  | (79)
Other comprehensive income (loss), net of tax |  | (5) |  |  | (3)
Ending balance |  | (385) |  |  | (385)
Adjustments | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (359) |  |  | (304)
Net income including noncontrolling interests |  | (24) |  |  | (79)
Ending balance |  | (383) |  |  | (383)
Adjustments | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 3 |  |  | 1
Other comprehensive income (loss), net of tax |  | (5) |  |  | (3)
Ending balance |  | (2) |  |  | (2)
Adjustments | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (356) |  |  | (303)
Net income including noncontrolling interests |  | (24) |  |  | (79)
Other comprehensive income (loss), net of tax |  | (5) |  |  | (3)
Ending balance |  | (385) |  |  | (385)
Virginia Electric and Power Company |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 28,922 | 22,309 | 25,096 | [2] | 21,613
Net income including noncontrolling interests | 690 | 650 | 1,810 |  | 1,588
Other comprehensive income (loss), net of tax | (1) | (3) | (6) |  | 4
Ending balance | 31,368 | 22,955 | 31,368 |  | 22,955
Virginia Electric and Power Company | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 13,156 | 12,185 | 12,136 |  | 11,496
Net income including noncontrolling interests | 668 | 650 | 1,688 |  | 1,588
Ending balance | 13,825 | 12,834 | 13,825 |  | 12,834
Virginia Electric and Power Company | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 23 | 24 | 28 |  | 17
Other comprehensive income (loss), net of tax | (1) | (3) | (6) |  | 4
Ending balance | 22 | 21 | 22 |  | 21
Virginia Electric and Power Company | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 25,265 | 22,309 | 22,157 |  | 21,613
Net income including noncontrolling interests | 668 | 650 | 1,688 |  | 1,588
Other comprehensive income (loss), net of tax | (1) | (3) | (6) |  | 4
Ending balance | $ 27,333 | 22,955 | 27,333 |  | 22,955
Virginia Electric and Power Company | As Previously Reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (22,359) | 25,153 |  | 21,657
Net income including noncontrolling interests |  | 654 |  |  | 1,598
Other comprehensive income (loss), net of tax |  | (2) |  |  | 5
Ending balance |  | 23,010 |  |  | 23,010
Virginia Electric and Power Company | As Previously Reported | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 12,236 |  |  | 11,541
Net income including noncontrolling interests |  | 654 |  |  | 1,598
Ending balance |  | 12,889 |  |  | 12,889
Virginia Electric and Power Company | As Previously Reported | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 23 |  |  | 16
Other comprehensive income (loss), net of tax |  | (2) |  |  | 5
Ending balance |  | 21 |  |  | 21
Virginia Electric and Power Company | As Previously Reported | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 22,359 |  |  | 21,657
Net income including noncontrolling interests |  | 654 |  |  | 1,598
Other comprehensive income (loss), net of tax |  | (2) |  |  | 5
Ending balance |  | 23,010 |  |  | 23,010
Virginia Electric and Power Company | Adjustments |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (50) | $ (57) |  | (44)
Net income including noncontrolling interests |  | (4) |  |  | (10)
Other comprehensive income (loss), net of tax |  | (1) |  |  | (1)
Ending balance |  | (55) |  |  | (55)
Virginia Electric and Power Company | Adjustments | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (51) |  |  | (45)
Net income including noncontrolling interests |  | (4) |  |  | (10)
Ending balance |  | (55) |  |  | (55)
Virginia Electric and Power Company | Adjustments | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 1 |  |  | 1
Other comprehensive income (loss), net of tax |  | (1) |  |  | (1)
Ending balance |  | 0 |  |  | 0
Virginia Electric and Power Company | Adjustments | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (50) |  |  | (44)
Net income including noncontrolling interests |  | (4) |  |  | (10)
Other comprehensive income (loss), net of tax |  | (1) |  |  | (1)
Ending balance |  | $ (55) |  |  | $ (55)
[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.

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