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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Lessee Lease Disclosure [Line Items]    
Finance lease assets, accumulated amortization $ 39  
Lease Right Of Use Assets 455 $ 504
Lease Liabilities 452 504
Discontinued Operations [Member]    
Lessee Lease Disclosure [Line Items]    
Lease Right Of Use Assets 26  
Lease Liabilities 24  
Virginia Electric and Power Company    
Lessee Lease Disclosure [Line Items]    
Finance lease assets, accumulated amortization 3  
Lease Right Of Use Assets 184 209
Lease Liabilities 182 209
Dominion Energy Gas Holdings, LLC    
Lessee Lease Disclosure [Line Items]    
Finance lease assets, accumulated amortization 1  
Lease Right Of Use Assets 37 64
Lease Liabilities $ 56 [1] $ 64
[1] Includes amounts reflected in discontinued operations.