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Investments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Gain (Loss) on Investments [Line Items] |  |  |  |
Amount contributed to Atlantic Coast Pipeline | $ 146 | $ 23 |  |
Investment in equity method affiliates | 1,713 |  | $ 1,561 | [1]
Atlantic Coast Pipeline |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Amount contributed to Atlantic Coast Pipeline | 117 |  |  |
Dominion Gas Holdings, LLC |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Equity in earnings on investments | 7 | 6 |  |
Dominion Gas Holdings, LLC | Iroquois | Partnership Interest |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Equity in earnings on investments | 7 | 6 |  |
Distributions received from investment | 6 | $ 6 |  |
Investment in equity method affiliates | 99 |  | 98 |
Carrying amount of investment that exceeded share of underlying equity | 8 |  | 8 |
Categories of Investments, Marketable Securities, Trading Securities |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Rabbi trust securities | $ 108 |  | $ 104 |
[1] | Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

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