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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Significant noncash investing and financing activities:    
Accrued capital expenditures [1] $ 1,037 $ 753
Leases [1],[2] 68 161
Virginia Electric and Power Company    
Significant noncash investing and financing activities:    
Accrued capital expenditures 851 566
Leases [3] $ 50 $ 142
[1] See Note 3 for noncash financing activities related to debt assumed with the closing of the East Ohio Transaction.
[2] Includes $11 million and $26 million of financing leases at March 31, 2025 and 2024, respectively, and $57 million and $135 million of operating leases at March 31, 2025 and 2024, respectively.
[3] Includes $9 million and $22 million of financing leases at March 31, 2025 and 2024, respectively, and $41 million and $120 million of operating leases at March 31, 2025 and 2024, respectively.