XML 71 R61.htm IDEA: XBRL DOCUMENT v3.25.3
Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Parenthetical) (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Schedule Of Supplemental Cash Flow Information [Line Items]    
Financing leases $ 281 $ 100
Operating leases 34 83
Virginia Electric and Power Company    
Schedule Of Supplemental Cash Flow Information [Line Items]    
Financing leases 62 89
Operating leases $ 255 $ 67