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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | $ (3,384) | $ (2,921)
Purchased gas |  | 305 | 119
Electric fuel and other energy-related purchases |  | 575 | 634
Interest and related charges |  | 292 | 226
Other income |  | (116) | (54)
Income from operations including noncontrolling interests before income tax expense |  | (949) | (710)
Income tax expense |  | 275 | 179
Other operations and maintenance |  | 738 | 703
Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [1] | (490) | (431)
Purchased gas | [1] | 43 | 34
Interest and related charges | [1] | 23 | 22
Other income |  | (5) | 0
Income from operations including noncontrolling interests before income tax expense |  | (165) | (159)
Income tax expense |  | 57 | 61
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 |  | (37) | (102)
Income tax expense |  | 14 | 39
Income from continuing operations including noncontrolling interests |  | (23) | (63)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations including noncontrolling interests before income tax expense |  | 18 | (4)
Income tax expense |  | (7) | 2
Income from continuing operations including noncontrolling interests |  | 11 | (2)
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | (62) | (114)
Purchased gas |  | (1) | 6
Electric fuel and other energy-related purchases |  | 1 | 3
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | 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 | 3
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 1 |
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | 14 |
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | 14 |
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 |  | (53) | (10)
Impairment |  | 9 | 7
Income from operations including noncontrolling interests before income tax expense |  | (44) | (3)
Income tax expense |  | 16 | 1
Income from continuing operations including noncontrolling interests |  | (28) | (2)
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
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (8) | (6)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 13 | 8
Unrecognized pension and other postretirement benefit costs: | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 1 | 1
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 0 | 0
Prior service (credit) costs | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other operations and maintenance |  | (4) | (3)
Actuarial (gains) losses | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other operations and maintenance |  | 25 | 17
Actuarial (gains) losses | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other operations and maintenance |  | $ 1 | $ 1
[1] | See Note 17 for amounts attributable to related parties.

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