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Significant Accounting Policies - (Schedule of Revision of Previously Issued Consolidated Statements of Income and Statements of Comprehensive Income) (Parenthetical) (Details) - 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] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax | $ (5) | $ (15) | $ (13) | $ (5)
Virginia Electric and Power Company |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax | $ (1) | (3) | $ (1) | (2)
As Previously Reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax |  | 10 |  | (2)
As Previously Reported | Virginia Electric and Power Company |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax |  | 2 |  | 1
Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax |  | (5) |  | (3)
Adjustments | Virginia Electric and Power Company |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax |  | $ (1) |  | $ (1)

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