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Leases (Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases) (Detail) | Dec. 31, 2023 | Dec. 31, 2022
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Lessee Lease Disclosure [Line Items] |  |
Weighted average remaining lease term - finance leases | 5 years | 4 years
Weighted average remaining lease term - operating leases | 31 years | 29 years
Weighted average discount rate - finance leases | 7.14% | 5.77%
Weighted average discount rate - operating leases | 4.11% | 3.91%
Virginia Electric and Power Company |  |
Lessee Lease Disclosure [Line Items] |  |
Weighted average remaining lease term - finance leases | 5 years | 6 years
Weighted average remaining lease term - operating leases | 33 years | 30 years
Weighted average discount rate - finance leases | 7.28% | 6.12%
Weighted average discount rate - operating leases | 4.18% | 3.90%

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