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Equity (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ (3,086) | $ (3,132) | $ (2,598) | $ (2,921) | $ (2,556) | $ (2,971) | $ (2,747) | $ (3,409) | $ (11,737) |  | $ (11,683) |  | $ (12,436) |
Purchased gas |  |  |  |  |  |  |  |  |  | 459 |  | 551 |  | 1,355 |
Electric fuel and other energy-related purchases |  |  |  |  |  |  |  |  |  | 2,333 |  | 2,725 |  | 3,400 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1,010 |  | 904 |  | 1,193 |
Other Income |  |  |  |  |  |  |  |  |  | (250) |  | (196) |  | (250) |
Impairment |  |  |  |  |  |  |  |  |  | 23 |  | 31 |  | 13 |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | (2,867) |  | (2,828) |  | (1,778) |
Income tax expense |  |  |  |  |  |  |  |  |  | 655 |  | 905 |  | 452 |
Other operations and maintenance |  |  |  |  |  |  |  |  |  | 3,064 |  | 2,595 |  | 2,765 |
Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | (457) | (382) | (368) | (431) | (425) | (365) | (395) | (531) | (1,638) | [1] | (1,716) | [1] | (1,898) | [1]
Purchased gas | [1] |  |  |  |  |  |  |  |  | 109 |  | 133 |  | 315 |
Interest and related charges | [1] |  |  |  |  |  |  |  |  | 94 |  | 73 |  | 27 |
Other Income |  |  |  |  |  |  |  |  |  | (11) |  | (1) |  | (1) |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | (607) |  | (740) |  | (846) |
Income tax expense |  |  |  |  |  |  |  |  |  | 215 |  | 283 |  | 334 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ (1,711) | $ (2,211) | $ (1,776) | $ (1,890) | $ (1,614) | $ (2,058) | $ (1,813) | $ (2,137) | (7,588) | [2] | (7,622) | [2] | (7,579) | [2]
Electric fuel and other energy-related purchases | [2] |  |  |  |  |  |  |  |  | 1,973 |  | 2,320 |  | 2,406 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 461 |  | 443 |  | 411 |
Other Income |  |  |  |  |  |  |  |  |  | (56) |  | (68) |  | (93) |
Impairment |  |  |  |  |  |  |  |  |  | 3 |  | 4 |  | 2 |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | (1,945) |  | (1,746) |  | (1,406) |
Income tax expense |  |  |  |  |  |  |  |  |  | 727 |  | 659 |  | $ 548 |
Deferred (gains) and losses on derivatives-hedging activities: | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | (259) |  | (176) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | 100 |  | 68 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  | (159) |  | (108) |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Reclassification out of Accumulated Other Comprehensive Income | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | 15 |  | (6) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | (6) |  | 3 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  | 9 |  | (3) |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Commodity | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | (330) |  | (203) |  |  |
Purchased gas |  |  |  |  |  |  |  |  |  | 13 |  | 15 |  |  |
Electric fuel and other energy-related purchases |  |  |  |  |  |  |  |  |  | 10 |  | 1 |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Commodity | Reclassification out of Accumulated Other Comprehensive Income | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | (4) |  | (6) |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Commodity | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric fuel and other energy-related purchases |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 31 |  | 11 |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate | Reclassification out of Accumulated Other Comprehensive Income | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Reclassification out of Accumulated Other Comprehensive Income | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |
Unrealized (gains) and losses on investment securities: | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain) loss on sale of securities |  |  |  |  |  |  |  |  |  | (66) |  | (110) |  |  |
Impairment |  |  |  |  |  |  |  |  |  | 23 |  | 31 |  |  |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | (43) |  | (79) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | 15 |  | 29 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  | (28) |  | (50) |  |  |
Unrealized (gains) and losses on investment securities: | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain) loss on sale of securities |  |  |  |  |  |  |  |  |  | (9) |  | (14) |  |  |
Impairment |  |  |  |  |  |  |  |  |  | 3 |  | 4 |  |  |
Income from continuing operations including noncontrolling interests before income taxes |  |  |  |  |  |  |  |  |  | (6) |  | (10) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | 2 |  | 4 |  |  |
Income from continuing operations including noncontrolling interests |  |  |  |  |  |  |  |  |  | (4) |  | (6) |  |  |
Unrecognized pension and other postretirement benefit costs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  |  |  |  |  |  |  |  |  | 56 |  | 86 |  |  |
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  |  |  |  |  |  |  | (22) |  | (35) |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  |  | 34 |  | 51 |  |  |
Unrecognized pension and other postretirement benefit costs: | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  |  |  |  |  |  |  |  |  | 5 |  | 7 |  |  |
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  |  |  |  |  |  |  | (2) |  | (3) |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  |  | 3 |  | 4 |  |  |
Prior-service costs (credits) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  |  | (15) |  | (12) |  |  |
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  |  | 71 |  | 98 |  |  |
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  |  | $ 5 |  | $ 7 |  |  |
[1] | See Note 24 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to affiliates.

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