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Investments (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2014 mi | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Cost to acquire equity method investments |  |  | $ 184 |  |  |  |
Contributions to equity method affiliates |  |  | 178 |  |  |  |
Other payables | [1] |  | 1,414 |  |  | $ 1,827 | [2]
Investment in equity method affiliates |  |  | 1,886 |  |  | 1,646 | [3]
Revenue |  |  | 4,323 | $ 3,631 |  |  |
Other receivables | [4] |  | 248 |  |  | 367 | [3]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Other payables | [5] |  | 190 |  |  | 161 | [6]
Equity in earnings on investments |  |  | 15 | 13 |  |  |
Investment in equity method affiliates |  |  | 312 |  |  | 312 | [6]
Revenue |  |  | 555 | 565 |  |  |
Other receivables | [5] |  | 33 |  |  | 26 | [6]
Dominion Energy Gas Holdings, LLC | Partnership Interest |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity in earnings on investments |  |  | 15 | 13 |  |  |
Distributions received from investment |  |  | 15 | 15 |  |  |
Investment in equity method affiliates |  |  | 312 |  |  | 312 |
Carrying amount of investment that exceeded share of underlying equity |  |  | $ 146 |  |  | 146 |
Pivotal LNG | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired |  |  | 100.00% |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  | $ 16 | 95 |  |  |
Project cost estimates |  |  | $ 8,000 |  |  |  |
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired |  |  | 5.00% |  |  |  |
Percentage ownership in total units |  |  | 53.00% |  |  |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Other payables |  |  | $ 5 |  |  | 7 |
Revenue |  |  | 20 | 31 |  |  |
Other receivables |  |  | $ 8 |  |  | 7 |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Length of natural gas pipeline (in miles) | mi |  | 600 |  |  |  |  |
Duration of contract |  | 20 years |  |  |  |  |
JAX LNG LLC | Pivotal LNG |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of interest held |  |  | 50.00% |  |  |  |
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% |  |
Trading Securities |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Rabbi trust securities |  |  | $ 116 |  |  | $ 120 |
[1] | See Note 10 for amounts attributable to related parties
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date
[4] | See Note 10 for amounts attributable to related parties.
[5] | See Note 19 for amounts attributable to related parties.
[6] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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