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Related-Party Transactions (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Virginia Electric and Power Company          
Related Party Transaction [Line Items]          
Commodity purchases from affiliates $ 104 $ 119 $ 315 $ 391  
Services provided by affiliates [1] 114 161 235 280  
Virginia Electric and Power Company | Affiliated Entity          
Related Party Transaction [Line Items]          
Services provided to related parties 4 8 9 14  
Dominion Energy Gas Holdings, LLC          
Related Party Transaction [Line Items]          
Services provided by affiliates [2] 37 59 80 104  
Services provided to related parties [3] 29 45 61 90  
Other receivables [4] 7   7   $ 7
Other deferred charges and other assets 10   10   12
Dominion Energy Gas Holdings, LLC | Affiliated Entity          
Related Party Transaction [Line Items]          
Commodity purchases from affiliates 3 0 6 0  
Services provided to related parties 60 $ 60 128 $ 127  
Imbalances receivable from affiliates 3   3   8
Imbalances payable to affiliates [5] $ 2   $ 2   $ 1
[1] Includes capitalized expenditures of $34 million for both the three months ended June 30, 2020 and 2019, and $68 million and $67 million for the six months ended June 30, 2020 and 2019, respectively.
[2] Includes capitalized expenditures of $4 million and $5 million for the three months ended June 30, 2020 and 2019, respectively, and $7 million and $11 million for the six months ended June 30, 2020 and 2019, respectively.
[3] Amounts primarily attributable to Atlantic Coast Pipeline, a related-party VIE.
[4] Represents amounts due from Atlantic Coast Pipeline, a related-party VIE.
[5] Amounts are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.