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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Significant noncash investing and financing activities:    
Accrued capital expenditures [1] $ 930 $ 884
Leases [2] 183 294
Virginia Electric and Power Company    
Significant noncash investing and financing activities:    
Accrued capital expenditures 738 646
Leases [3] $ 156 $ 253
[1] See Notes 3 and 17 for noncash financing activities related to debt assumed with closing of the East Ohio Transaction, the Questar Gas Transaction and the PSNC Transaction and the transfer of property associated with the settlement of litigation.
[2] Includes $100 million and $51 million of financing leases at September 30, 2024 and 2023, respectively, and $83 million and $243 million of operating leases at September 30, 2024 and 2023, respectively.
[3] Includes $89 million and $44 million of financing leases at September 30, 2024 and 2023, respectively, and $67 million and $209 million of operating leases at September 30, 2024 and 2023, respectively.