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Investments (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2014 Member mi | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  | $ 197,000,000 | $ 14,000,000 | $ 111,000,000 |
Distributions received from investment |  |  |  |  |  |  |  |  |  | 209,000,000 | 419,000,000 | 104,000,000 |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  |  |  | $ 161,000,000 | $ 249,000,000 |  | 161,000,000 | 249,000,000 |  |
Equity method investment goodwill |  |  |  |  |  |  | 176,000,000 | 73,000,000 |  | 176,000,000 | 73,000,000 |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  | 197,000,000 | (18,000,000) | 111,000,000 |
Additional membership percentage interest purchased |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Payment for purchase of equity interest |  |  |  | $ 14,000,000 |  |  |  |  |  |  |  |  |
Other receivables | [1] |  |  |  |  |  | 331,000,000 | 126,000,000 |  | 331,000,000 | 126,000,000 |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  | 428,000,000 | 370,000,000 | 198,000,000 |
Impairment charge |  |  |  |  |  |  |  |  |  | 403,000,000 | 15,000,000 | 4,000,000 |
Liabilities, other deferred credits and other liabilities |  |  |  |  |  |  | 17,075,000,000 | 16,631,000,000 |  | 17,075,000,000 | 16,631,000,000 |  |
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 |  |  |  |  |  |  | 146,000,000 | 15,000,000 |  | 146,000,000 | 15,000,000 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  | 24,000,000 | 21,000,000 | 21,000,000 |
Other receivables | [2] |  |  |  |  |  | 17,000,000 | 15,000,000 |  | 17,000,000 | 15,000,000 |  |
Impairment charge |  |  |  |  |  |  | 219,000,000 |  |  | 346,000,000 | 16,000,000 |  |
Liabilities, other deferred credits and other liabilities |  |  |  |  |  |  | 2,944,000,000 | 2,866,000,000 |  | 2,944,000,000 | 2,866,000,000 |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  | 28,000,000 | 24,000,000 | 22,000,000 |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  |  |  | 8,000,000 | 8,000,000 |  | 8,000,000 | 8,000,000 |  |
Equity in earnings on investments |  |  |  |  |  |  |  |  |  | 24,000,000 | 21,000,000 | 21,000,000 |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  |  |  |  | 111,000,000 | 112,000,000 |  | 111,000,000 | 112,000,000 |  |
Other Income [Member] | Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling partnership interest sold |  |  |  |  | 0.65% |  |  |  |  |  |  |  |
Sales price of non-controlling partnership interest |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Amount of after tax gain from sale |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  | 36,000,000 | 270,000,000 |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  | 414,000,000 | 310,000,000 | 184,000,000 |
Atlantic Coast Pipeline | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates increase |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 203,000,000 | 129,000,000 | $ 95,000,000 |
Other receivables |  |  |  |  |  |  | 13,000,000 | 12,000,000 |  | $ 13,000,000 | 12,000,000 |  |
Atlantic Coast Pipeline | Minimum | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  |  |  | 7,250,000,000 |  |  |  |
Atlantic Coast Pipeline | Maximum | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  |  |  | $ 7,750,000,000 |  |  |  |
Atlantic Coast Pipeline | Previous Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  | 6,000,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Current Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  | 7,000,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Previous Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  | 6,500,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Current Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  | $ 7,500,000,000 |  |  |  |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  |  |  |  |  | 48.00% |  |  | 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% |  |  | 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% |  |  | 5.00% |  |  |
Blue Racer |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  | $ 546,000,000 |  |  |  |  |  |
Amount of after tax gain from sale |  |  |  |  |  |  | $ 390,000,000 |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Up-front cash consideration |  |  |  |  |  |  | $ 1,050,000,000 |  |  |  |  |  |
Additional deferred consideration, subject to increase for interest cost effective payable upon purchaser's availability of cash |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |
Blue Racer | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of contingent consideration, maximum |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Blue Racer | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to repurchase portion of Western System from Blue Racer |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
NedPower Mount Storm LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, other deferred credits and other liabilities |  |  |  |  |  |  | 1,000,000 | 17,000,000 |  | $ 1,000,000 | $ 17,000,000 |  |
NedPower Mount Storm LLC | Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  | 126,000,000 |  |  |  |  |
Impairment charge, after tax |  |  |  |  |  |  |  | $ 76,000,000 |  |  |  |  |
Fowler I Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  | 32,000,000 |  |  |  |  |  |
Impairment charge, after tax |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |
Fair value of investment |  |  |  |  |  |  | $ 81,000,000 |  |  | $ 81,000,000 |  |  |
Catalyst Old River Hydroelectric Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  | $ 91,000,000 |  |  |  |  |  |  |  |  |  |  |
Catalyst Old River Hydroelectric Limited Partnership | Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  | 87,000,000 |  |  |  |  |  |  |  |  |  |  |
Amount of after tax gain from sale |  | $ 63,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.

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