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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue | [1] | $ (4,269) | $ (3,451) | $ (12,097) | $ (10,005)
Interest and related charges |  | 451 | 378 | 1,372 | 1,053
Other income |  | (173) | (373) | (653) | (658)
Income from operations before income tax expense |  | (1,036) | (1,145) | (574) | (2,372)
Income tax expense |  | 51 | 262 | 208 | 485
Electric fuel and other energy-related purchases |  | 774 | 761 | 2,283 | 2,128
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue | [2] | (392) | (423) | (1,303) | (1,408)
Interest and related charges | [2] | 26 | 28 | 77 | 79
Other income |  | (35) | (34) | (103) | (99)
Income from operations before income tax expense |  | (119) | (192) | (328) | (428)
Income tax expense |  | 27 | 56 | 73 | 111
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Income from operations before income tax expense |  | (7) | 40 |  | 95
Income tax expense |  | 1 | (10) |  | (24)
Income (loss) including noncontrolling interests, net of tax |  | (6) | 30 |  | 71
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Income from operations before income tax expense |  | 12 | 7 | 15 | 22
Income tax expense |  | (3) | (2) | (4) | (6)
Income (loss) including noncontrolling interests, net of tax |  | 9 | 5 | 11 | 16
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Commodity contracts |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | (35) | 26 |  | 55
Purchased gas |  | 2 |  |  | 2
Electric fuel and other energy-related purchases |  |  |  |  | (8)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Commodity contracts | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | (2) | 3 | (4) | 8
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Interest rate contracts |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges |  | 14 | 12 |  | 36
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Interest rate contracts | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges |  | 2 | 2 | 5 | 4
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Foreign currency |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | 12 | 2 |  | 10
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | 12 | 2 | 14 | 10
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Realized (gain) loss on sale of securities |  | (5) | 3 | (6) | 5
Income from operations before income tax expense |  | (5) | 3 | (6) | 5
Income tax expense |  | 1 |  | 1 | (1)
Income (loss) including noncontrolling interests, net of tax |  | (4) | 3 | (5) | 4
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | (5) | (5) | (18) | (16)
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | 31 | 30 | 85 | 91
Unrecognized pension and other postretirement benefit costs: |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 26 | 25 | 67 | 75
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (6) | (7) | (17) | (15)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 20 | 18 | 50 | 60
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 |  | 1 | 2 | 5 | 5
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 1 | 2 | 4 | 4
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Income from operations before income tax expense |  |  |  | (77) |
Income tax expense |  |  |  | 19 |
Income (loss) including noncontrolling interests, net of tax |  |  |  | (58) |
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 |  | $ 1 | $ 2 | 5 | $ 5
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI | Commodity contracts |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  |  |  | (127) |
Purchased gas |  |  |  | (1) |
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI | Interest rate contracts |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges |  |  |  | 37 |
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI | Foreign currency |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  |  |  | $ 14 |
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 20 for amounts attributable to related parties.

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