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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail)
$ in Millions
Dec. 31, 2021
USD ($)
Bath Country Pumped Storage Station  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 60.00% [1]
Plant in service $ 1,063 [1]
Accumulated depreciation (714) [1]
Plant under construction $ 6 [1]
North Anna  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 88.40% [1]
Plant in service $ 2,532 [1]
Accumulated depreciation (1,381) [1]
Nuclear fuel 730 [1]
Accumulated amortization of nuclear fuel (576) [1]
Plant under construction $ 178 [1]
Clover Power Station  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 50.00% [1]
Plant in service $ 610 [1]
Accumulated depreciation (273) [1]
Plant under construction $ 1 [1]
Millstone Unit  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 93.50% [2]
Plant in service $ 1,353 [2]
Accumulated depreciation (522) [2]
Nuclear fuel 549 [2]
Accumulated amortization of nuclear fuel (406) [2]
Plant under construction $ 127 [2]
Summer Unit  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 66.70% [2]
Plant in service $ 1,522 [2]
Accumulated depreciation (699) [2]
Nuclear fuel 603 [2]
Accumulated amortization of nuclear fuel (387) [2]
Plant under construction $ 76 [2]
[1] Units jointly owned by Virginia Power.
[2] Unit jointly owned by Dominion Energy.