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Investments (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2014 member mi | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  | $ 187 |  | $ 282 |  |  |
Investment in equity method affiliates |  |  |  |  | $ 1,528 |  |  |  | 1,528 |  |  |  | $ 1,278 | [1]
Other receivables | [2] |  |  |  | 363 |  |  |  | 363 |  |  |  | $ 331 | [1]
Blue Racer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration including interest received in connection with sale |  |  |  |  |  |  | $ 151 |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
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 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Scenario Forecast | Wrangler Retail Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  | $ 250 |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  | 135 |  |  |  |  |  |  |  |  |  |
Amount of after tax gain from sale |  |  |  | 75 |  |  |  |  |  |  |  |  |  |
Write-off of goodwill |  |  |  | $ 70 |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  |  |  | 313 |  |  |  | 313 |  |  |  | $ 339 | [3]
Other receivables |  |  |  |  | 19 | [4] |  |  | 19 | [4] |  |  | 18 | [3],[5]
Equity in earnings on investments |  |  |  |  | 8 |  |  | $ 10 | 30 |  | 41 |  |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  |  |  | 313 |  |  |  | 313 |  |  |  | 339 |
Equity in earnings on investments |  |  |  |  |  |  |  |  | 30 |  | 41 |  |  |
Investment in equity method contributions made |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  | 60 |  | 47 |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  | 146 |  |  |  | 146 |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  | 47 |  |  | 147 | 175 |  | 306 |  |  |
Atlantic Coast Pipeline | Minimum | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  |  |  |  |  |  | $ 7,300 |  |
Atlantic Coast Pipeline | Maximum [Member] | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  |  |  |  |  |  | $ 7,800 |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 24 |  |  | $ 50 | 81 |  | $ 156 |  |  |
Other receivables |  |  |  |  | 9 |  |  |  | 9 |  |  |  | 13 |
Atlantic Coast Pipeline | Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  |  |  | $ 10 |  |  |  | $ 10 |  |  |  |  |
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% |  |  |  |  |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  |  | $ 114 |  |  |  | $ 114 |  |  |  | $ 111 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | See Note 10 for amounts attributable to related parties.
[3] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | See Note 20 for amounts attributable to affiliates.
[5] | See Note 20 for amounts attributable to related parties.

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