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Significant Accounting Policies - Schedule of Capitalized to Property Plant and Equipment for Capitalized Interest Costs and AFUDC (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]      
Capitalized interest costs and AFUDC debt $ 152 $ 109 $ 43
AFUDC equity [1] 109 50 41
Virginia Power      
Public Utility, Property, Plant and Equipment [Line Items]      
Capitalized interest costs and AFUDC debt 46 47 27
AFUDC equity [1] $ 96 $ 39 $ 39
[1] The Companies include AFUDC equity in other adjustments within operating activities in their Consolidated Statements of Cash Flows.