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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Virginia Electric and Power Company | Bath Country Pumped Storage Station  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 60.00% [1]
Plant in service $ 1,058 [1]
Accumulated depreciation (661) [1]
Plant under construction $ 7 [1]
Virginia Electric and Power Company | North Anna  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 88.40% [1]
Plant in service $ 2,564 [1]
Accumulated depreciation (1,321) [1]
Nuclear fuel 793 [1]
Accumulated amortization of nuclear fuel (634) [1]
Plant under construction $ 143 [1]
Virginia Electric and Power Company | Clover Power Station  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 50.00% [1]
Plant in service $ 610 [1]
Accumulated depreciation (247) [1]
Plant under construction $ 5 [1]
Dominion Energy | Millstone Unit  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 93.50% [2]
Plant in service $ 1,267 [2]
Accumulated depreciation (449) [2]
Nuclear fuel 483 [2]
Accumulated amortization of nuclear fuel (390) [2]
Plant under construction $ 87 [2]
Dominion Energy | Summer Unit  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 66.70% [2]
Plant in service $ 1,394 [2]
Accumulated depreciation (659) [2]
Nuclear fuel 608 [2]
Accumulated amortization of nuclear fuel (389) [2]
Plant under construction $ 77 [2]
[1] Units jointly owned by Virginia Power.
[2] Unit jointly owned by Dominion Energy.