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Investments (Narrative) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2014 member mi | Mar. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Equity earnings on investments |  |  |  |  |  | $ 111 | $ 56 | $ 46
Company received distribution from Fowler Ridge in connection with non-recourse permanent financing |  |  |  |  |  | 104 | 83 | 60
Carrying amount of Company's investments exceeded its shares of underlying equity | $ 260 |  |  |  |  | 260 | 234 |
Equity method investment goodwill | 176 |  |  |  |  | 176 | 162 |
Oil and Gas Properties | Blue Racer |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Amount paid to repurchase portion of Western System from Blue Racer | 10 |  |  |  |  |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Carrying amount of Company's investments exceeded its shares of underlying equity | $ 84 |  |  |  |  | $ 84 | 72 |
Blue Racer |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  | $ 84 |  |  |
Proceeds from Blue Racer |  |  |  |  | 84 |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Additional membership percentage interest purchased |  | 3.00% |  |  |  |  |  |
Purchase price for additional membership interests |  | $ 14 |  |  |  |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest (percentage) | 48.00% |  |  |  |  | 48.00% |  |
Length of natural gas pipeline (in miles) | mi |  |  |  | 600 |  |  |  |
Number of members | member |  |  |  | 3 |  |  |  |
Duration of contract |  |  |  | 20 years |  |  |  |
Atlantic Coast Pipeline | Pipelines | Duke Energy | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest (percentage) | 47.00% |  |  |  |  | 47.00% |  |
Atlantic Coast Pipeline | Pipelines | Southern Company Gas | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest (percentage) | 5.00% |  |  |  |  | 5.00% |  |
Other operations and maintenance expense | Blue Racer |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  | 34 |  |  |
Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Equity earnings on investments |  |  |  |  |  | $ 21 | 23 | 21
Company received distribution from Fowler Ridge in connection with non-recourse permanent financing |  |  |  |  |  | 22 | 28 | $ 20
Carrying amount of Company's investments exceeded its shares of underlying equity | $ 8 |  |  |  |  | 8 | 8 |
Dominion Gas Holdings, LLC | Iroquois | Partnership Interest |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Percentage of non-controlling partnership interest sold |  |  | 0.65% |  |  |  |  |
Sales price of non-controlling partnership interest |  |  | $ 7 |  |  |  |  |
Amount of gain from sale |  |  | 5 |  |  |  |  |
Amount of after tax gain from sale |  |  | $ 3 |  |  |  |  |
Dominion Gas Holdings, LLC | Blue Racer |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from Blue Racer |  |  |  |  | 17 |  |  |
Extinguishment of affiliated current borrowings |  |  |  |  | 67 |  |  |
Dominion Gas Holdings, LLC | Other operations and maintenance expense | Blue Racer |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Gain from sale |  |  |  |  | 59 |  |  |
After tax gain on sale |  |  |  |  | 35 |  |  |
Write off of goodwill |  |  |  |  | $ 3 |  |  |
Categories of Investments, Marketable Securities, Trading Securities |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Investments held in our rabbi trusts | $ 104 |  |  |  |  | $ 104 | $ 100 |

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