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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax | $ (1) | $ (4) | $ (8) | $ 10
Virginia Electric and Power Company |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax | $ 0 | (1) | $ 0 | 1
As Previously Reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax |  | (2) |  | 8
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 |  | 0 |  | 1
Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Changes in unrealized net gains (losses) on investment securities, tax |  | (2) |  | 2
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) |  | $ 0

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