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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) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | $ 1,700 | $ 659
Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 169 | 98
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 3,477 | 3,181
Prior service (credit) cost |  | 7 | 8
Total | [1] | 3,484 | 3,189
Pension Benefits | Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 555 | 367
Total | [2] | 555 | 367
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 350 | 283
Prior service (credit) cost |  | (393) | (440)
Total | [1] | (43) | (157)
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 89 | 76
Prior service (credit) cost |  | (52) | (52)
Total | [2] | $ 37 | $ 24
[1] | 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. As of December 31, 2017, of the $3.2 billion and $(157) million related to pension benefits and other postretirement benefits, $1.9 billion and $(87) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities.
[2] | 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. As of December 31, 2017, of the $367 million related to pension benefits, $134 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $24 million related to other postretirement benefits is included entirely in regulatory assets and liabilities.

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