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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
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Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | $ 3,484 | $ 3,189
Amount included in AOCI |  | 2,000 | 1,900
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | (43) | (157)
Amount included in AOCI |  | (41) | (87)
Dominion Energy Gas Holdings, LLC | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | 555 | 367
Amount included in AOCI |  | 200 | 134
Dominion Energy Gas Holdings, LLC | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | 37 | 24
Dominion Energy Gas Holdings, LLC | Noncurrent Assets of Discontinued Operations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | $ 22 | $ 25
[1] | As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in noncurrent assets of discontinued operations; of the $37 million related to other postretirement benefits, $22 million is included in noncurrent assets of discontinued operations with the remainder included 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 noncurrent assets of discontinued operations; of the $24 million related to other postretirement benefits, $25 million is included in noncurrent assets of discontinued operations with the difference included in regulatory liabilities.

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