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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Provision for current income taxes | $ (70) | $ 51 | $ 3
Deferred income taxes charged to common shareholders' equity | 96 |  |
Unrecognized tax benefits that would impact effective tax rate | 45 | 69 | 77
Increase (decrease) in unrecognized tax benefits (less than $1 million) | (18) | (6) | (47)
Maximum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations | 25 |  |
Amount that earnings could potentially increase if changes were to occur | 20 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal tax credits | 129 |  |
Realizable domestic production activities deduction | 17 |  |
Federal | IRS |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Benefit related to carryback recognized |  | 20 |
Virginia Electric and Power Company |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Provision for current income taxes | 258 | 408 | 152
Unrecognized tax benefits that would impact effective tax rate | 9 | 8 | 8
Increase (decrease) in unrecognized tax benefits (less than $1 million) | 1 | 1 |
Virginia Electric and Power Company | Maximum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations | 3 |  |
Amount that earnings could potentially increase if changes were to occur | 3 |  |
Dominion Gas Holdings, LLC |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Provision for current income taxes | (23) | 120 | 118
Unrecognized tax benefits that would impact effective tax rate | 5 | 19 | 19
Increase (decrease) in unrecognized tax benefits (less than $1 million) | (11) | $ 1 | $ 1
Dominion Gas Holdings, LLC | Maximum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations | 7 |  |
Amount that earnings could potentially increase if changes were to occur | 5 |  |
Dominion Midstream Partners, LP | Questar Pipeline, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Provision for current income taxes | $ 212 |  |

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