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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [1] | $ (3,858) | $ (3,466)
Purchased gas |  | 730 | 340
Interest and related charges |  | 469 | 314
Other income |  | (388) | (100)
Income from operations before income tax expense |  | 563 | (661)
Income tax expense |  | 114 | 135
Electric fuel and other energy-related purchases |  | 791 | 744
Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [2] | (511) | (526)
Purchased gas | [2] | 40 | 29
Interest and related charges | [2] | 26 | 25
Other income |  | (34) | (33)
Income from operations before income tax expense |  | (150) | (218)
Income tax expense |  | 34 | 52
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations before income tax expense |  | (41) | 11
Income tax expense |  | 10 | (3)
Income (loss) including noncontrolling interests, net of tax |  | (31) | 8
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations before income tax expense |  | 5 | (4)
Income tax expense |  | (1) | 1
Income (loss) including noncontrolling interests, net of tax |  | 4 | (3)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Commodity contracts |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | (54) | 12
Purchased gas |  | (3) | 2
Electric fuel and other energy-related purchases |  |  | (7)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Commodity contracts | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | (2) | 3
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Interest rate contracts |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 10 | 12
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Interest rate contracts | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 1 | 1
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Foreign currency |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | 6 | (8)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | 6 | (8)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations before income tax expense |  |  | 1
Income (loss) including noncontrolling interests, net of tax |  |  | 1
Realized (gain) loss on sale of securities |  |  | 1
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | (5) | (5)
Unrecognized pension and other postretirement benefit costs: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 22 | 26
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (14) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 8 | 25
Unrecognized pension and other postretirement benefit costs: | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 2 | 2
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 1 | 1
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | 2 | 2
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | $ 27 | $ 31
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 19 for amounts attributable to related parties.

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