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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.

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