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Significant Accounting Policies (Schedule of Revision of Previously Issued Consolidated Balance Sheets) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred income taxes $ 7,744   $ 7,135 [1]      
Regulatory liabilities - noncurrent 8,768   8,761 [1]      
Other deferred credits and other liabilities [2] 8,759   8,528 [1]      
Total deferred credits and other liabilities 26,849   25,799 [1]      
Total liabilities 79,871   72,613 [1]      
Retained earnings 2,333   1,641 [1]      
Accumulated other comprehensive (loss) income (139)   (152) [1]      
Shareholders' equity 27,691   26,863 [1]      
Total equity 31,726 $ 30,872 29,802 [1] $ 27,146 $ 26,717 $ 27,264
As Previously Reported            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred income taxes     6,412      
Regulatory liabilities - noncurrent     9,196      
Other deferred credits and other liabilities     8,426      
Total deferred credits and other liabilities     25,409      
Total liabilities     72,223      
Retained earnings     2,035      
Accumulated other comprehensive (loss) income     (156)      
Shareholders' equity     27,253      
Total equity     30,192 27,531 27,073 27,567
Adjustments            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred income taxes     723      
Regulatory liabilities - noncurrent     (435)      
Other deferred credits and other liabilities     102      
Total deferred credits and other liabilities     390      
Total liabilities     390      
Retained earnings     (394)      
Accumulated other comprehensive (loss) income     4      
Shareholders' equity     (390)      
Total equity     (390) (385) (356) (303)
Virginia Electric and Power Company            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred income taxes 4,852   4,476 [3]      
Regulatory liabilities - noncurrent 6,236   6,139 [3]      
Other deferred credits and other liabilities [4],[5] 6,585   6,275 [3]      
Total deferred credits and other liabilities 18,357   17,616 [3]      
Total liabilities 44,537   43,291 [3]      
Retained earnings 13,825   12,136 [3]      
Accumulated other comprehensive (loss) income 22   28 [3]      
Shareholders' equity 27,333   22,157 [3]      
Total equity $ 31,368 $ 28,922 25,096 [3] 22,955 22,309 21,613
Virginia Electric and Power Company | As Previously Reported            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred income taxes     4,045      
Regulatory liabilities - noncurrent     6,574      
Other deferred credits and other liabilities     6,214      
Total deferred credits and other liabilities     17,559      
Total liabilities     43,234      
Retained earnings     12,194      
Accumulated other comprehensive (loss) income     27      
Shareholders' equity     22,214      
Total equity     25,153 23,010 (22,359) 21,657
Virginia Electric and Power Company | Adjustments            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred income taxes     431      
Regulatory liabilities - noncurrent     (435)      
Other deferred credits and other liabilities     61      
Total deferred credits and other liabilities     57      
Total liabilities     57      
Retained earnings     (58)      
Accumulated other comprehensive (loss) income     1      
Shareholders' equity     (57)      
Total equity     $ (57) $ (55) $ (50) $ (44)
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[2] See Note 15 for amounts attributable to VIEs.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[4] See Note 15 for amounts attributable to VIEs.
[5] See Note 19 for amounts attributable to affiliates.