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Leases (Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases) (Detail) | Dec. 31, 2022 | Dec. 31, 2021
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Lessee Lease Disclosure [Line Items] |  |
Weighted average remaining lease term - finance leases | 4 years | 5 years
Weighted average remaining lease term - operating leases | 29 years | 27 years
Weighted average discount rate - finance leases | 5.77% | 2.77%
Weighted average discount rate - operating leases | 3.91% | 3.96%
Virginia Electric and Power Company |  |
Lessee Lease Disclosure [Line Items] |  |
Weighted average remaining lease term - finance leases | 6 years | 6 years
Weighted average remaining lease term - operating leases | 30 years | 25 years
Weighted average discount rate - finance leases | 6.12% | 2.27%
Weighted average discount rate - operating leases | 3.90% | 4.00%

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