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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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