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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.