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Employee Benefit Plans (AOCI and regulatory assets and liabilities that have not been recognized as components of periodic benefit (credit) cost) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | $ 3,332 | $ 3,484
Amount included in AOCI |  | 2,000 | 2,000
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | (98) | (43)
Amount included in AOCI |  | (65) | (41)
Dominion Energy Gas Holdings, LLC | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [2] | 150 | 555
Amount included in AOCI |  | 147 | 200
Dominion Energy Gas Holdings, LLC | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [2] | $ (5) | 37
Dominion Energy Gas Holdings, LLC | Noncurrent Assets of Discontinued Operations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  | $ 22
[1] | As of December 31, 2019, of the $3.3 billion and $(98) million related to pension benefits and other postretirement benefits, $2.0 billion and $(65) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2018, of the $3.5 billion and $(43) million related to pension benefits and other postretirement benefits, $2.0 billion and $(41) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities.
[2] | As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $37 million related to other postretirement benefits is included entirely in regulatory assets and liabilities.

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