v3.26.3
Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Significant noncash investing and financing activities:    
Accrued capital expenditures $ 1,320 $ 891
Leases [1] 366 315
Virginia Electric and Power Company    
Significant noncash investing and financing activities:    
Accrued capital expenditures 1,193 727
Leases [2] $ 448 $ 317
[1] Includes $64 million and $281 million of financing leases entered in during the nine months ended September 30, 2026 and 2025, respectively, and $302 million and $34 million of operating leases entered in during the nine months ended September 30, 2026 and 2025, respectively.
[2] Includes $54 million and $62 million of financing leases entered in during the nine months ended September 30, 2026 and 2025, respectively, $300 million and $255 million of operating leases entered in during the nine months ended September 30, 2026 and 2025, respectively, and $94 million for modifications of operating leases during the nine months ended September 30, 2026.