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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue | [1] | $ (3,970) | $ (3,088) | $ (7,828) | $ (6,554)
Interest and related charges |  | 452 | 361 | 921 | 675
Other income |  | (92) | (185) | (480) | (285)
Income from operations before income tax expense |  | (101) | (566) | 462 | (1,227)
Income tax expense (benefit) |  | 43 | 88 | 157 | 223
Purchased gas |  | 227 | 64 | 957 | 404
Electric fuel and other energy-related purchases |  | 718 | 623 | 1,509 | 1,367
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue | [2] | (530) | (508) | (1,096) | (898)
Net income from discontinued operations |  | 26 | 45 | 80 | 102
Interest and related charges |  | 86 | 46 | 173 | 50
Other income |  | (44) | (16) | (85) | (33)
Income from operations before income tax expense |  | (146) | (71) | (361) | (271)
Income tax expense (benefit) |  | 23 | (13) | 66 | 31
Income (loss) including noncontrolling interests, net of tax |  | (123) | (84) | (295) | (240)
Purchased gas | [2] | (3) | (6) | 9 | 8
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 |  | (29) | 44 |  | 55
Income tax expense (benefit) |  | 8 | (11) |  | (14)
Income (loss) including noncontrolling interests, net of tax |  | (21) | 33 |  | 41
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 |  | (2) | 18 | 1 | 15
Income tax expense (benefit) |  |  | (5) |  | (4)
Income (loss) including noncontrolling interests, net of tax |  | (2) | 13 | 1 | 11
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Commodity contracts |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | (38) | 16 | (92) | 28
Purchased gas |  |  |  | (3) | 2
Electric fuel and other energy-related purchases |  |  |  |  | (7)
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] |  |  |  |  |
Net income from discontinued operations |  |  | 2 | (2) | 5
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 |  | 13 | 12 | 23 | 24
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 |  | 1 | 2
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Foreign currency |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | (4) | 16 | 2 | 8
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 |  | (4) | 16 | 2 | 8
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 |  | (1) | 1 | (1) | 2
Income from operations before income tax expense |  | (1) | 1 | (1) | 2
Income tax expense (benefit) |  |  | (1) |  | (1)
Income (loss) including noncontrolling interests, net of tax |  | (1) |  | (1) | 1
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | (8) | (5) | (13) | (11)
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | 27 | 29 | 54 | 61
Unrecognized pension and other postretirement benefit costs: |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 19 | 24 | 41 | 50
Unrecognized pension and other postretirement benefit costs, income tax expense |  | 3 | (7) | (11) | (8)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 22 | 17 | 30 | 42
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 | 1 | 4 | 3
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 2 | 1 | 3 | 2
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 |  |  |  | (70) |
Income tax expense (benefit) |  |  |  | 18 |
Income (loss) including noncontrolling interests, net of tax |  |  |  | (52) |
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 | $ 1 | $ 4 | $ 3
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 20 for amounts attributable to related parties.

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