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Investments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Contributions to equity method affiliates |  | $ 87 | $ 146 |  |
Operating Revenue | [1] | 3,466 | 3,384 |  |
Other receivables | [1] | 136 |  | $ 126 | [2]
Liabilities, other deferred credits and other liabilities |  | 16,853 |  | 16,631 | [2]
Investment in equity method affiliates |  | 1,638 |  | 1,544 | [2]
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating Revenue | [3] | 526 | 490 |  |
Other receivables | [3] | 22 |  | 15 | [4]
Liabilities, other deferred credits and other liabilities |  | 2,904 |  | 2,866 | [4]
Equity in earnings on investments |  | 9 | 7 |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings on investments |  | 9 | 7 |  |
Distributions received from investment |  | 7 | 6 |  |
Investment in equity method affiliates |  | 97 |  | 95 |
Carrying amount of investment that exceeded share of underlying equity |  | 8 |  |  |
Atlantic Coast Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Contributions to equity method affiliates |  | 78 | 117 |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating Revenue |  | 46 | 31 |  |
Other receivables |  | 17 | $ 12 |  |
NedPower Mount Storm LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Liabilities, other deferred credits and other liabilities |  | 9 |  | 17 |
Trading Securities |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Rabbi trust securities |  | $ 114 |  | $ 112 |
[1] | See Note 10 for amounts attributable to related parties.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See Note 18 for amounts attributable to related parties.
[4] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

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