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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.

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