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Investments (Investments Under Equity Method of Accounting) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Balance |  | $ 1,561 | $ 1,320
Blue Racer |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 50.00% |
Investment Balance |  | $ 677 | 661
Description |  | Midstream gas and related services |
Atlantic Coast Pipeline |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 48.00% |
Investment Balance |  | $ 256 | 59
Description |  | Gas transmission system |
Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% | [1] | 50.00% |
Investment Balance |  | $ 316 | 324
Description |  | Gas transmission system |
Fowler Ridge |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 50.00% |
Investment Balance |  | $ 116 | 125
Description |  | Wind-powered merchant generation facility |
NedPower |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 50.00% |
Investment Balance |  | $ 112 | 119
Description |  | Wind-powered merchant generation facility |
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Balance |  | $ 84 | 32
Dominion Gas Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Balance |  | $ 98 | 102
Dominion Gas Holdings, LLC | Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% | [1] | 24.07% |
Investment Balance |  | $ 98 | $ 102
Description |  | Gas transmission system |
Dominion Midstream Partners, LP | Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% | [1] | 25.93% |
[1] | Comprised of Dominion Midstream's interest of 25.93% and Dominion Gas' interest of 24.07%. See Note 15 for more information.

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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