v3.26.1
Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Significant noncash investing and financing activities:    
Accrued capital expenditures $ 1,175 $ 871
Leases [1] 340 37
Virginia Electric and Power Company    
Significant noncash investing and financing activities:    
Accrued capital expenditures 1,032 685
Leases [2] $ 426 $ 29
[1] Includes $41 million and $25 million of financing leases entered in during the six months ended June 30, 2026 and 2025, respectively, and $299 million and $12 million of operating leases entered in during the six months ended June 30, 2026 and 2025, respectively.
[2] Includes $35 million and $22 million of financing leases entered in during the six months ended June 30, 2026 and 2025, respectively, $297 million and $7 million of operating leases entered in during the six months ended June 30, 2026 and 2025, respectively, and $94 million for modifications of operating leases during the six months ended June 30, 2026.