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Investments (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 member mi | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  | $ 69 |  |  | $ 87 |  |  |
Investment in equity method affiliates |  |  | 1,433 | $ 1,278 | [1] |  |  | $ 1,278 | [1]
Other receivables | [2] |  | 203 | 331 | [1] |  |  | $ 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% |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  | 337 | 339 | [3] |  |  | $ 339 | [3]
Other receivables | [4] |  | 13 | 18 | [3] |  |  | 18 | [3]
Equity in earnings on investments |  |  | 13 |  |  | 20 |  |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  | 337 | 339 |  |  |  | 339 |
Equity in earnings on investments |  |  | 13 |  |  | 20 |  |  |
Distributions received from investment |  |  | 15 |  |  | 15 |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  | 146 | 146 |  |  |  | 146 |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  | 95 |  |  | 78 |  |  |
Atlantic Coast Pipeline | Previous Minimum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  | 6,000 |  |  |  |  |
Atlantic Coast Pipeline | Previous Maximum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  | 6,500 |  |  |  |  |
Atlantic Coast Pipeline | Current Minimum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  | 7,000 |  |  |  |  |
Atlantic Coast Pipeline | Current Maximum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  | 7,500 |  |  |  |  |
Atlantic Coast Pipeline | Scenario Forecast |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates increase |  |  |  |  |  |  | $ 250 |  |
Atlantic Coast Pipeline | Minimum | Scenario Forecast |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  | 7,250 |  |
Atlantic Coast Pipeline | Maximum | Scenario Forecast |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Project cost estimates |  |  |  |  |  |  | $ 7,750 |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  | 31 |  |  | $ 46 |  |  |
Other receivables |  |  | 11 | 13 |  |  |  | 13 |
Atlantic Coast Pipeline | Current Liabilities |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  | $ 32 |  |  |  |  |  |
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% |  |  |  |  |  |
Trading Securities |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  | $ 112 | $ 111 |  |  |  | $ 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 19 for amounts attributable to related parties.

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