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Investments (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2014 mi Member | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Feb. 25, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  | $ 168 | $ 197 | $ 14 |
Distributions received from investment |  |  |  |  |  | 112 | 209 | 419 |
Carrying amount of investment that exceeded share of underlying equity |  |  |  | $ 161 |  | 110 | 161 |  |
Equity method investment goodwill |  |  |  | 49 |  | 159 | 49 |  |
Equity in earnings on investments |  |  |  |  |  | 168 | 197 | (18) |
Length of natural gas pipeline (in miles) | mi |  |  | 600 |  |  |  |  |  |
Other receivables | [1] |  |  | 331 |  | 367 | 331 |  |
Contributions to equity method affiliates |  |  |  |  |  | 209 | 428 | 370 |
Impairment charge |  |  |  |  |  | 1,535 | 403 | 15 |
Liabilities, other deferred credits and other liabilities |  |  |  | $ 17,075 |  | 26,027 | 17,075 |  |
Income tax expense |  |  |  |  |  | 351 | $ 580 | (30) |
Cost to acquire equity method investments |  |  |  |  |  |  |  |  | $ 175
Blue Racer |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.00% |  |  | 50.00% |  |
Additional consideration including interest received in connection with sale |  |  |  |  |  | 151 |  |  |
Wrangler Retail Gas Holdings L L C |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  | $ 147 |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  | 20.00% |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  |  |  | $ 301 |  |  |
Goodwill write-off |  |  |  |  |  | 73 |  |  |
Income tax expense |  |  |  |  |  | 82 |  |  |
Residential contract asset |  |  |  |  |  | 41 |  |  |
Intial Fair value |  |  |  |  |  | 75 |  |  |
Catalyst Old River Hydroelectric Limited Partnership |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  | 25.00% |  |  |  |  |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  | $ 146 | $ 15 |  | $ 146 | 15 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity in earnings on investments |  |  |  |  |  | 43 | 54 | 47 |
Other receivables | [2] |  |  | 18 |  | 26 | 18 |  |
Impairment charge |  |  |  | 219 |  | 13 | 163 | 15 |
Liabilities, other deferred credits and other liabilities |  |  |  | 2,213 |  | 2,277 | 2,213 |  |
Income tax expense |  |  |  |  |  | 101 | 124 | (65) |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  | 74 | 64 | 55 |
Carrying amount of investment that exceeded share of underlying equity |  |  |  | 146 |  |  | 146 |  |
Equity in earnings on investments |  |  |  |  |  | 43 | 54 | 47 |
Trading Securities |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  | 111 |  | 120 | 111 |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  | 36 | 270 |
Contributions to equity method affiliates |  |  |  |  |  | $ 186 | 414 | 310 |
Ownership percentage |  |  |  |  |  | 48.00% |  |  |
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 53.00%
Ownership percentage acquired |  |  |  |  |  |  |  |  | 5.00%
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | $ 103 | 203 | 129 |
Other receivables |  |  |  | $ 13 |  | 7 | $ 13 |  |
Atlantic Coast Pipeline | Previous Maximum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  | $ 8 |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  |  | 48.00% |  |  | 48.00% |  |
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 |  |  |  |  |  |  |  |  |
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 |  |
Amount of after tax gain from sale |  |  |  |  |  |  | 390 |  |
Up-front cash consideration |  |  |  |  |  |  | 1,050 |  |
Additional deferred consideration, subject to increase for interest cost effective payable upon purchaser's availability of cash |  |  |  |  |  |  | 150 |  |
Aggregate amount of contingent consideration, maximum |  |  |  | $ 300 |  |  | 300 |  |
NedPower Mount Storm LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Liabilities, other deferred credits and other liabilities |  |  |  | 1 | 17 |  | 1 | $ 17 |
NedPower Mount Storm LLC | Property, Plant and Equipment |  |  |  |  |  |  |  |  |
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 |  |
Ownership percentage |  |  |  |  |  | 50.00% |  |  |
Catalyst Old River Hydroelectric Limited Partnership |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  | $ 91 |  |  |  |  |  |  |
Catalyst Old River Hydroelectric Limited Partnership | Other Income |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Amount of gain from sale |  | 87 |  |  |  |  |  |  |
Amount of after tax gain from sale |  | $ 63 |  |  |  |  |  |  |
Iroquois |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 50.00% |  |  |
Iroquois | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 50.00% |  |  |
Iroquois | Oil and Gas Properties |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% |  |  | 100.00% |  |
White River Hub LLC | Oil and Gas Properties |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% |  |  | 100.00% |  |
Pivotal LNG | JAX LNG LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest held |  |  |  |  |  |  |  |  | 50.00%
Pivotal LNG | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  | 100.00%
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 25 for amounts attributable to related parties.

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