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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total investments $ 1,708 $ 1,279  
Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total investments [1] 840 705  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 9,631 7,197 $ 8,062
Total investments 1,266 1,003  
Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 686 1,656 1,803
Total investments 391 310  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,880 1,581 1,729
Total investments 442 276  
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 227 311 $ 333
Total investments 106 63  
Collective Bargaining Agreement | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 6,248 4,424  
Total recorded at NAV [2] 3,406 2,762  
Total investments [3] 9,654 7,186  
Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 450 1,017  
Total recorded at NAV [2] 238 636  
Total investments [4] 688 1,653  
Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 23 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 1 4  
Collective Bargaining Agreement | Pension Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value [5] 2,284 1,645  
Collective Bargaining Agreement | Pension Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 177 378  
Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,634 1,061  
Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 114 244  
Collective Bargaining Agreement | Pension Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 360 318  
Collective Bargaining Agreement | Pension Benefits | Insurance contracts | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 28 73  
Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,132 752  
Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 69 173  
Collective Bargaining Agreement | Pension Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 815 630  
Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 61 145  
Collective Bargaining Agreement | Pension Benefits | Common/collective trust funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 2,355 1,849  
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] 157 425  
Collective Bargaining Agreement | Pension Benefits | Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 91 108  
Collective Bargaining Agreement | Pension Benefits | Real Estate Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 7 25  
Collective Bargaining Agreement | Pension Benefits | Private Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 787 633  
Collective Bargaining Agreement | Pension Benefits | Private Equity Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 61 146  
Collective Bargaining Agreement | Pension Benefits | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 159 155  
Collective Bargaining Agreement | Pension Benefits | Fixed Income Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 12 36  
Collective Bargaining Agreement | Pension Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 14 17  
Collective Bargaining Agreement | Pension Benefits | Hedge Funds | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 1 4  
Collective Bargaining Agreement | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,045 829  
Total recorded at NAV [2] 836 751  
Total investments [6] 1,881 1,580  
Collective Bargaining Agreement | Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 107 143  
Total recorded at NAV [2] 120 168  
Total investments 227 311  
Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 2 2  
Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 719 554  
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 86 113  
Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 206 170  
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 21 30  
Collective Bargaining Agreement | Other Postretirement Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 21 19  
Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 51 45  
Collective Bargaining Agreement | Other Postretirement Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 46 39  
Collective Bargaining Agreement | Other Postretirement Benefits | Common/collective trust funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 717 650  
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] 105 148  
Collective Bargaining Agreement | Other Postretirement Benefits | Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 8 10  
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] 1 2  
Collective Bargaining Agreement | Other Postretirement Benefits | Private Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 100 80  
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] 14 18  
Collective Bargaining Agreement | Other Postretirement Benefits | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at NAV [2] 10 10  
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 4,271 2,771  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 297 637  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 22 17  
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 1 4  
Level 1 | Collective Bargaining Agreement | Pension Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value [5] 2,284 1,645  
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 177 378  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,634 1,061  
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 114 244  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 273 23  
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 3 5  
Level 1 | Collective Bargaining Agreement | Pension Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 58 25  
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 2 6  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 930 728  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 107 143  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 2 1  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 719 554  
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 86 113  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 206 170  
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 21 30  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1 1  
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 2 2  
Level 2 | Collective Bargaining Agreement | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1,977 1,653  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 153 380  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 1 1  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 360 318  
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 28 73  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 859 729  
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 66 168  
Level 2 | Collective Bargaining Agreement | Pension Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 757 605  
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 59 139  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 115 101  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value   1  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 21 19  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value 50 44  
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Total recorded at fair value $ 44 $ 37  
[1] See Note 25 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 $52 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $99 million at December 31, 2019. 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.
[4] Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $6 million at December 31, 2019. 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.
[5] Includes $508 million of Dominion Energy common stock at December 31, 2019.
[6] Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2019. 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.