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Leases (Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases) (Detail) | Dec. 31, 2020 | Dec. 31, 2019
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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 | 26 years | 22 years
Weighted average discount rate - finance leases | 3.17% | 3.83%
Weighted average discount rate - operating leases | 4.07% | 4.48%
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 | 21 years | 20 years
Weighted average discount rate - finance leases | 2.51% | 4.12%
Weighted average discount rate - operating leases | 4.26% | 4.29%

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