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Significant Accounting Policies (Schedule of Revision of Previously Issued Consolidated Statements of Equity) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | $ 30,349 | $ 27,120 | $ 29,802 | [1] | $ 27,264
Net income including noncontrolling interests | 814 | 563 | 1,525 |  | 966
Other comprehensive income (loss), net of tax | 5 | 11 | 7 |  | 8
Ending balance | 30,872 | 26,717 | 30,872 |  | 26,717
Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 1,727 | 1,749 | 1,641 |  | 1,925
Net income including noncontrolling interests | 760 | 563 | 1,425 |  | 966
Ending balance | 1,906 | 1,724 | 1,906 |  | 1,724
Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | (150) | (175) | (152) |  | (172)
Other comprehensive income (loss), net of tax | 5 | 11 | 7 |  | 8
Ending balance | (145) | (164) | (145) |  | (164)
Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 26,992 | 27,120 | 26,863 |  | 27,264
Net income including noncontrolling interests | 760 | 563 | 1,425 |  | 966
Other comprehensive income (loss), net of tax | 5 | 11 | 7 |  | 8
Ending balance | 27,215 | 26,717 | 27,215 |  | 26,717
As Previously Reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 27,457 | 30,192 |  | 27,567
Net income including noncontrolling interests |  | 580 |  |  | 1,021
Other comprehensive income (loss), net of tax |  | 13 |  |  | 6
Ending balance |  | 27,073 |  |  | 27,073
As Previously Reported | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 2,091 |  |  | 2,229
Net income including noncontrolling interests |  | 580 |  |  | 1,021
Ending balance |  | 2,083 |  |  | 2,083
As Previously Reported | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (180) |  |  | (173)
Other comprehensive income (loss), net of tax |  | 13 |  |  | 6
Ending balance |  | (167) |  |  | (167)
As Previously Reported | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 27,457 |  |  | 27,567
Net income including noncontrolling interests |  | 580 |  |  | 1,021
Other comprehensive income (loss), net of tax |  | 13 |  |  | 6
Ending balance |  | 27,073 |  |  | 27,073
Adjustments |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (337) | (390) |  | (303)
Net income including noncontrolling interests |  | (17) |  |  | (55)
Other comprehensive income (loss), net of tax |  | (2) |  |  | 2
Ending balance |  | (356) |  |  | (356)
Adjustments | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (342) |  |  | (304)
Net income including noncontrolling interests |  | (17) |  |  | (55)
Ending balance |  | (359) |  |  | (359)
Adjustments | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 5 |  |  | 1
Other comprehensive income (loss), net of tax |  | (2) |  |  | 2
Ending balance |  | 3 |  |  | 3
Adjustments | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (337) |  |  | (303)
Net income including noncontrolling interests |  | (17) |  |  | (55)
Other comprehensive income (loss), net of tax |  | (2) |  |  | 2
Ending balance |  | (356) |  |  | (356)
Virginia Electric and Power Company |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 25,995 | 21,829 | 25,096 | [2] | 21,613
Net income including noncontrolling interests | 589 | 477 | 1,120 |  | 938
Other comprehensive income (loss), net of tax | 0 | 3 | (5) |  | 7
Ending balance | 28,922 | 22,309 | 28,922 |  | 22,309
Virginia Electric and Power Company | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 12,622 | 11,708 | 12,136 |  | 11,496
Net income including noncontrolling interests | 535 | 477 | 1,020 |  | 938
Ending balance | 13,156 | 12,185 | 13,156 |  | 12,185
Virginia Electric and Power Company | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 23 | 21 | 28 |  | 17
Other comprehensive income (loss), net of tax | 0 | 3 | (5) |  | 7
Ending balance | 23 | 24 | 23 |  | 24
Virginia Electric and Power Company | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance | 22,638 | 21,829 | 22,157 |  | 21,613
Net income including noncontrolling interests | 535 | 477 | 1,020 |  | 938
Other comprehensive income (loss), net of tax | 0 | 3 | (5) |  | 7
Ending balance | $ 25,265 | 22,309 | 25,265 |  | 22,309
Virginia Electric and Power Company | As Previously Reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 21,876 | 25,153 |  | 21,657
Net income including noncontrolling interests |  | 479 |  |  | 944
Other comprehensive income (loss), net of tax |  | 4 |  |  | 7
Ending balance |  | 22,359 |  |  | 22,359
Virginia Electric and Power Company | As Previously Reported | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 11,757 |  |  | 11,541
Net income including noncontrolling interests |  | 479 |  |  | 944
Ending balance |  | 12,236 |  |  | 12,236
Virginia Electric and Power Company | As Previously Reported | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 19 |  |  | 16
Other comprehensive income (loss), net of tax |  | 4 |  |  | 7
Ending balance |  | 23 |  |  | 23
Virginia Electric and Power Company | As Previously Reported | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 21,876 |  |  | 21,657
Net income including noncontrolling interests |  | 479 |  |  | 944
Other comprehensive income (loss), net of tax |  | 4 |  |  | 7
Ending balance |  | 22,359 |  |  | 22,359
Virginia Electric and Power Company | Adjustments |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (47) | $ (57) |  | (44)
Net income including noncontrolling interests |  | (2) |  |  | (6)
Other comprehensive income (loss), net of tax |  | (1) |  |  | 0
Ending balance |  | (50) |  |  | (50)
Virginia Electric and Power Company | Adjustments | Retained Earnings |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (49) |  |  | (45)
Net income including noncontrolling interests |  | (2) |  |  | (6)
Ending balance |  | (51) |  |  | (51)
Virginia Electric and Power Company | Adjustments | Accumulated other comprehensive income (loss) |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | 2 |  |  | 1
Other comprehensive income (loss), net of tax |  | (1) |  |  | 0
Ending balance |  | 1 |  |  | 1
Virginia Electric and Power Company | Adjustments | Shareholder's Equity |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  | (47) |  |  | (44)
Net income including noncontrolling interests |  | (2) |  |  | (6)
Other comprehensive income (loss), net of tax |  | (1) |  |  | 0
Ending balance |  | $ (50) |  |  | $ (50)
[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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