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Significant Accounting Policies (Schedule of Revision of Previously Issued Consolidated Statements of Cash Flows) (Detail) - 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]        
Net income including noncontrolling interests $ 1,028 $ 934 $ 2,553 $ 1,900
Operating Activities        
Deferred income taxes     455 (281)
Other operating assets and liabilities     68 (216)
Net cash provided by operating activities     4,374 4,377
As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net income including noncontrolling interests   958   1,979
Operating Activities        
Deferred income taxes       (346)
Other operating assets and liabilities       (230)
Net cash provided by operating activities       4,377
Adjustments        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net income including noncontrolling interests   (24)   (79)
Operating Activities        
Deferred income taxes       65
Other operating assets and liabilities       (14)
Net cash provided by operating activities       0
Virginia Electric And Power Company [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net income including noncontrolling interests $ 690 650 1,810 1,588
Operating Activities        
Deferred income taxes     225 381
Other operating assets and liabilities     323 (84)
Net cash provided by operating activities     $ 3,318 3,935
Virginia Electric And Power Company [Member] | As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net income including noncontrolling interests   654   1,598
Operating Activities        
Deferred income taxes       381
Other operating assets and liabilities       (94)
Net cash provided by operating activities       3,935
Virginia Electric And Power Company [Member] | Adjustments        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net income including noncontrolling interests   $ (4)   (10)
Operating Activities        
Deferred income taxes       0
Other operating assets and liabilities       (10)
Net cash provided by operating activities       $ 0