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Leases (Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases) (Detail) | Sep. 30, 2019
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Lessee Lease Disclosure [Line Items] |
Weighted average remaining lease term - finance leases | 6 years
Weighted average remaining lease term - operating leases | 21 years
Weighted average discount rate - finance leases | 4.36%
Weighted average discount rate - operating leases | 4.58%
Virginia Electric and Power Company |
Lessee Lease Disclosure [Line Items] |
Weighted average remaining lease term - finance leases | 6 years
Weighted average remaining lease term - operating leases | 17 years
Weighted average discount rate - finance leases | 4.65%
Weighted average discount rate - operating leases | 4.51%
Dominion Energy Gas Holdings, LLC |
Lessee Lease Disclosure [Line Items] |
Weighted average remaining lease term - finance leases | 6 years
Weighted average remaining lease term - operating leases | 9 years
Weighted average discount rate - finance leases | 4.55%
Weighted average discount rate - operating leases | 4.43%

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