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Leases (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2016
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
[1]
Leases Disclosure [Line Items]        
Property, plant and equipment, net   $ 67,141 $ 67,141 $ 54,560
Accumulated depreciation, depletion and amortization   27,732 27,732 $ 22,018
Corporate office | Agreement with Lessor to Construct and Lease Corporate Office Property        
Leases Disclosure [Line Items]        
Requested cash draws from lessor to fund project costs     340  
Required percentage payment of funded amount under certain events of default 89.90%      
Required percentage payment for specific full recourse events 100.00%      
Lease term 5 years      
Extension term of lease 5 years      
Required percentage payment to lessor for difference between project costs and sales proceeds 87.00%      
Lessor | Corporate office | Agreement with Lessor to Construct and Lease Corporate Office Property        
Leases Disclosure [Line Items]        
Amount of financing commitments to fund estimated project costs $ 365      
Power Purchase Arrangements        
Leases Disclosure [Line Items]        
Property, plant and equipment, net   2,800 2,800  
Accumulated depreciation, depletion and amortization   318 318  
Rental revenue   53 82  
Depreciation expense   $ 24 $ 47  
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.