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Investments (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 member mi | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  | $ 132 | $ 134 |  |  |
Investment in equity method affiliates |  |  | $ 1,467 |  | $ 1,278 | [1] |  | 1,467 |  |  | $ 1,278 | [1]
Other receivables | [2] |  | 188 |  | 331 | [1] |  | 188 |  |  | $ 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 |  |  | 331 |  | 339 | [3] |  | 331 |  |  | $ 339 | [3]
Other receivables | [4] |  | 13 |  | 18 | [3] |  | 13 |  |  | 18 | [3]
Equity in earnings on investments |  |  | 9 |  |  |  | $ 11 | 22 | 31 |  |  |
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  | 331 |  | 339 |  |  | 331 |  |  | 339 |
Equity in earnings on investments |  |  |  |  |  |  |  | 22 | 31 |  |  |
Distributions received from investment |  |  |  |  |  |  |  | 30 | 31 |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  | 146 |  | 146 |  |  | 146 |  |  | 146 |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  | 33 |  |  |  | 81 | 128 | 159 |  |  |
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 |  |  | 26 |  |  |  | $ 60 | 57 | $ 106 |  |  |
Other receivables |  |  | 10 |  | 13 |  |  | 10 |  |  | 13 |
Atlantic Coast Pipeline | Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity method affiliates |  |  | $ 11 |  |  |  |  | $ 11 |  |  |  |
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 |  |  | $ 113 |  | $ 111 |  |  | $ 113 |  |  | $ 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 related parties.

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