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Employee Benefit Plans (Fair values of pension and post retirement plan assets by asset category) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total investments $ 1,279 $ 1,378  
Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total investments [1] 705 716  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 7,197 8,062 $ 7,016
Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,656 1,803 1,542
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,581 1,729 1,512
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 311 333 $ 299
Collective Bargaining Agreement | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 4,424 4,878  
Total recorded at NAV [2] 2,762 3,169  
Total investments [3] 7,186 8,047  
Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,017 1,090  
Total recorded at NAV [2] 636 709  
Total investments [4] 1,653 1,799  
Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 18 18  
Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 4 4  
Collective Bargaining Agreement | Pension Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,645 1,902  
Collective Bargaining Agreement | Pension Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 378 425  
Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,061 1,151  
Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 244 257  
Collective Bargaining Agreement | Pension Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 318 352  
Collective Bargaining Agreement | Pension Benefits | Insurance contracts | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 73 79  
Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 752 770  
Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 173 172  
Collective Bargaining Agreement | Pension Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 630 685  
Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 145 153  
Collective Bargaining Agreement | Pension Benefits | Common/collective trust funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 1,849 2,272  
Collective Bargaining Agreement | Pension Benefits | Common/collective trust funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 425 509  
Collective Bargaining Agreement | Pension Benefits | Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 108 111  
Collective Bargaining Agreement | Pension Benefits | Real Estate Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 25 25  
Collective Bargaining Agreement | Pension Benefits | Private Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 633 606  
Collective Bargaining Agreement | Pension Benefits | Private Equity Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 146 135  
Collective Bargaining Agreement | Pension Benefits | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 155 161  
Collective Bargaining Agreement | Pension Benefits | Fixed Income Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 36 36  
Collective Bargaining Agreement | Pension Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 17 19  
Collective Bargaining Agreement | Pension Benefits | Hedge Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 4 4  
Collective Bargaining Agreement | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 829 944  
Total recorded at NAV [2] 751 783  
Total investments [5] 1,580 1,727  
Collective Bargaining Agreement | Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 143 163  
Total recorded at NAV [2] 168 170  
Total investments 311 333  
Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 2 3  
Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 554 636  
Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 113 130  
Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 170 196  
Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 30 33  
Collective Bargaining Agreement | Other Postretirement Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 19 21  
Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 45 46  
Collective Bargaining Agreement | Other Postretirement Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 39 42  
Collective Bargaining Agreement | Other Postretirement Benefits | Common/collective trust funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 650 689  
Collective Bargaining Agreement | Other Postretirement Benefits | Common/collective trust funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 148 154  
Collective Bargaining Agreement | Other Postretirement Benefits | Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 10 9  
Collective Bargaining Agreement | Other Postretirement Benefits | Real Estate Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 2 1  
Collective Bargaining Agreement | Other Postretirement Benefits | Private Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 80 73  
Collective Bargaining Agreement | Other Postretirement Benefits | Private Equity Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 18 15  
Collective Bargaining Agreement | Other Postretirement Benefits | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 10 11  
Collective Bargaining Agreement | Other Postretirement Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 1 1  
Level 1 | Collective Bargaining Agreement | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 2,771 3,121  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 637 697  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 17 18  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 4 4  
Level 1 | Collective Bargaining Agreement | Pension Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,645 1,902  
Level 1 | Collective Bargaining Agreement | Pension Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 378 425  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,061 1,151  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 244 257  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 23 41  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 5 9  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 25 9  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 6 2  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 728 836  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 143 163  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1 1  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 554 636  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 113 130  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 170 196  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 30 33  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1 2  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 2 1  
Level 2 | Collective Bargaining Agreement | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,653 1,757  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 380 393  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1    
Level 2 | Collective Bargaining Agreement | Pension Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 318 352  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Insurance contracts | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 73 79  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 729 729  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 168 163  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 605 676  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 139 151  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 101 108  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1 2  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 19 21  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 44 44  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value $ 37 $ 41  
[1] See Note 24 for amounts attributable to related parties.
[2] These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
[3] Excludes net assets related to pending sales of securities of $12 million, net accrued income of $21 million, and includes net assets related to pending purchases of securities of $22 million at December 31, 2018. Excludes net assets related to pending sales of securities of $11 million, net accrued income of $19 million, and includes net assets related to pending purchases of securities of $15 million at December 31, 2017.
[4] Excludes net assets related to pending sales of securities of $3 million, net accrued income of $5 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2018. Excludes net assets related to pending sales of securities of $3 million, net accrued income of $4 million, and includes net assets related to pending purchases of securities of $3 million at December 31, 2017.
[5] Excludes net assets related to pending sales of securities of $1 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2018. Excludes net assets related to pending sales of securities of $1 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $1 million at December 31, 2017.