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Leases (Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases) (Detail) | Dec. 31, 2024 | Dec. 31, 2023
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Lessee Lease Disclosure [Line Items] |  |
Weighted average remaining lease term - finance leases | 5 years | 5 years
Weighted average remaining lease term - operating leases | 31 years | 31 years
Weighted average discount rate - finance leases | 5.61% | 7.14%
Weighted average discount rate - operating leases | 4.42% | 4.11%
Virginia Electric and Power Company |  |
Lessee Lease Disclosure [Line Items] |  |
Weighted average remaining lease term - finance leases | 5 years | 5 years
Weighted average remaining lease term - operating leases | 32 years | 33 years
Weighted average discount rate - finance leases | 6.71% | 7.28%
Weighted average discount rate - operating leases | 5.13% | 4.18%

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