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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Jul. 31, 2016
Lessee Lease Disclosure [Line Items]      
Operating lease assets $ 455 $ 504  
Finance lease assets 159 [1]   $ 67
Total lease assets 614    
Operating lease liabilities - current [2] 58    
Finance lease liabilities - current [3] 30    
Total lease liabilities - current 88    
Operating lease liabilities - noncurrent 394    
Finance lease liabilities - noncurrent [4] 132    
Total lease liabilities - noncurrent 526    
Total lease liabilities 614    
Virginia Electric and Power Company      
Lessee Lease Disclosure [Line Items]      
Operating lease assets 184 209  
Finance lease assets [1] 15    
Total lease assets 199    
Operating lease liabilities - current [2] 30    
Finance lease liabilities - current [3] 3    
Total lease liabilities - current 33    
Operating lease liabilities - noncurrent 152    
Finance lease liabilities - noncurrent [4] 11    
Total lease liabilities - noncurrent 163    
Total lease liabilities 196    
Dominion Energy Gas Holdings, LLC      
Lessee Lease Disclosure [Line Items]      
Operating lease assets 56 $ 64  
Finance lease assets [1] 10    
Total lease assets 66    
Operating lease liabilities - current [2] 12    
Finance lease liabilities - current [3] 2    
Total lease liabilities - current 14    
Operating lease liabilities - noncurrent 44    
Finance lease liabilities - noncurrent [4] 8    
Total lease liabilities - noncurrent 52    
Total lease liabilities $ 66    
[1] Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $39 million, $3 million and $2 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at September 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.