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Investments (Narrative) (Detail) mi in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2014 Member mi | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (18) |  | $ 111 |  | $ 56 |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 419 |  | 104 |  | 83 |
Carrying amount of investment that exceeded share of underlying equity |  | $ 260 |  |  |  | $ 249 |  |  |  | $ 260 |  |  |  | 249 |  | 260 |  |  |
Equity method investment goodwill |  | 176 |  |  |  | 176 |  |  |  | 176 |  |  |  | 176 |  | 176 |  |  |
Additional membership percentage interest purchased |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for purchase of equity interest |  |  | $ 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 370 |  | 198 |  | 51 |
Liabilities, other deferred credits and other liabilities |  | 16,424 |  |  |  | 16,631 |  |  |  | 16,424 |  |  |  | 16,631 |  | 16,424 |  |  |
Operating Revenue |  |  |  |  |  | 3,210 | $ 3,179 | $ 2,813 | $ 3,384 | 3,086 | $ 3,132 | $ 2,598 | $ 2,921 | 12,586 | [1] | 11,737 | [1] | 11,683 | [1]
Other receivables | [1] | 183 |  |  |  | 126 |  |  |  | 183 |  |  |  | 126 |  | 183 |  |  |
Trading Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  | 104 |  |  |  | 112 |  |  |  | 104 |  |  |  | 112 |  | 104 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  | 21 |  | 23 |
Liabilities, other deferred credits and other liabilities |  | 2,863 |  |  |  | 2,866 |  |  |  | 2,863 |  |  |  | 2,866 |  | 2,863 |  |  |
Operating Revenue |  |  |  |  |  | 501 | $ 401 | $ 422 | $ 490 | 457 | $ 382 | $ 368 | $ 431 | 1,814 | [2] | 1,638 | [2] | 1,716 | [2]
Other receivables | [2] | 13 |  |  |  | 15 |  |  |  | 13 |  |  |  | 15 |  | 13 |  |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  | 21 |  | 23 |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 |  | 22 |  | 28 |
Carrying amount of investment that exceeded share of underlying equity |  | 8 |  |  |  | 8 |  |  |  | 8 |  |  |  | 8 |  | 8 |  |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest | Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite Lived Equity Method Investment Basis Difference [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  | 84 |  |  |  | 73 |  |  |  | 84 |  |  |  | 73 |  | 84 |  |  |
Blue Racer Midstream Llc [Member] | Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to repurchase portion of Western System from Blue Racer |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 270 |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 310 |  | 184 |  | 38 |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 129 |  | 95 |  | $ 74 |
Other receivables |  | $ 10 |  |  |  | 12 |  |  |  | $ 10 |  |  |  | 12 |  | $ 10 |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  | 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 | Jointly Owned Natural Gas Pipeline | Distribution | Duke Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution | Southern Company Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nedpower Mount Storm Llc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, other deferred credits and other liabilities |  |  |  |  |  | 17 |  |  |  |  |  |  |  | 17 |  |  |  |  |
Nedpower Mount Storm Llc [Member] | Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | 126 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge, after tax |  |  |  |  |  | 76 |  |  |  |  |  |  |  |  |  |  |  |  |
Fowler I Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | 32 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge, after tax |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment |  |  |  |  |  | $ 81 |  |  |  |  |  |  |  | $ 81 |  |  |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.

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