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Investments (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  | $ 252 | $ 76 |  |
Investment in equity method affiliates |  | $ 1,808 |  | 1,808 |  | $ 1,561 | [1]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity in earnings on investments |  | 4 | $ 3 | 11 | 9 |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contributions to equity method affiliates |  | 85 |  | 202 |  |  |
Iroquois | Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  | 11 | 9 |  |
Distributions received from investment |  |  |  | 11 | $ 11 |  |
Investment in equity method affiliates |  | 98 |  | 98 |  | 98 |
Carrying amount of investment that exceeded share of underlying equity |  | 8 |  | 8 |  | 8 |
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 |  |  |  |  |  |
Categories of Investments, Marketable Securities, Trading Securities |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Rabbi trust securities |  | $ 111 |  | $ 111 |  | $ 104 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

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