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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | $ (2,813) | $ (2,598) | $ (6,197) | $ (5,519)
Purchased gas |  | 112 | 56 | 417 | 175
Electric fuel and other energy-related purchases |  | 498 | 551 | 1,073 | 1,185
Interest and related charges |  | 308 | 239 | 600 | 465
Other income |  | (60) | (72) | (176) | (126)
Income from operations including noncontrolling interests before income tax expense |  | (553) | (614) | (1,502) | (1,324)
Income tax expense |  | 136 | 152 | 411 | 331
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue | [1] | (422) | (368) | (912) | (799)
Purchased gas | [1] | 38 | 16 | 81 | 50
Interest and related charges | [1] | 24 | 23 | 47 | 45
Other income |  | (5) | (6) | (10) | (6)
Income from operations including noncontrolling interests before income tax expense |  | (122) | (172) | (287) | (331)
Income tax expense |  | 45 | 67 | 102 | 128
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense |  | (29) | (72) | (66) | (174)
Income tax expense |  | 11 | 28 | 25 | 67
Income from continuing operations including noncontrolling interests |  | (18) | (44) | (41) | (107)
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 including noncontrolling interests before income tax expense |  | (19) | 2 | (1) | (2)
Income tax expense |  | 7 | (2) |  |
Income from continuing operations including noncontrolling interests |  | (12) |  | (1) | (2)
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | (19) | (87) | (81) | (201)
Purchased gas |  |  | 2 |  | 8
Electric fuel and other energy-related purchases |  | (2) | 3 | (2) | 6
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Operating revenue |  | (1) |  | 3 | (4)
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges |  | 11 | 8 | 23 | 11
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Interest and related charges |  | 1 |  | 2 |
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | (19) | 2 | (6) | 2
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other income |  | (19) | 2 | (6) | 2
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 |  | (11) | (20) | (64) | (30)
Impairment |  | 5 | 7 | 14 | 14
Income from operations including noncontrolling interests before income tax expense |  | (6) | (13) | (50) | (16)
Income tax expense |  | 2 | 5 | 18 | 6
Income from continuing operations including noncontrolling interests |  | (4) | (8) | (32) | (10)
Unrecognized pension and other postretirement benefit costs: |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 21 | 14 | 42 | 28
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (10) | (6) | (18) | (12)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 11 | 8 | 24 | 16
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 | 3 | 2
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 2 | 1 | 2 | 1
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other operations and maintenance |  | (5) | (3) | (9) | (7)
Other operations and maintenance |  | 26 | 17 | 51 | 35
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other operations and maintenance |  | $ 2 | $ 1 | $ 3 | $ 2
[1] | See Note 17 for amounts attributable to related parties.

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