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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Lessee Lease Disclosure [Line Items]    
Operating lease assets $ 468 $ 504
Finance lease assets [1] 87  
Total lease assets 555  
Operating lease liabilities - current [2] 59  
Finance lease liabilities - current [3] 15  
Total lease liabilities - current 74  
Operating lease liabilities - noncurrent 404  
Finance lease liabilities - noncurrent [4] 72  
Total lease liabilities - noncurrent 476  
Total lease liabilities 550  
Virginia Electric and Power Company    
Lessee Lease Disclosure [Line Items]    
Operating lease assets 191 209
Finance lease assets [1] 11  
Total lease assets 202  
Operating lease liabilities - current [2] 31  
Finance lease liabilities - current [3] 2  
Total lease liabilities - current 33  
Operating lease liabilities - noncurrent 158  
Finance lease liabilities - noncurrent [4] 8  
Total lease liabilities - noncurrent 166  
Total lease liabilities 199  
Dominion Energy Gas Holdings, LLC    
Lessee Lease Disclosure [Line Items]    
Operating lease assets 59 $ 64
Finance lease assets [1] 6  
Total lease assets 65  
Operating lease liabilities - current [2] 12  
Finance lease liabilities - current [3] 1  
Total lease liabilities - current 13  
Operating lease liabilities - noncurrent 47  
Finance lease liabilities - noncurrent [4] 5  
Total lease liabilities - noncurrent 52  
Total lease liabilities $ 65  
[1] Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $32 million, $2 million and $1 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at June 30, 2019.
[2] Included in other current liabilities in the Companies’ Consolidated Balance Sheets
[3] Included in securities due within one year in the Companies’ Consolidated Balance Sheets.
[4] Included in long-term debt in the Companies’ Consolidated Balance Sheets.