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Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Balance |  | $ 1,278 | $ 1,544
Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% | [1] | 50.00% |
Investment Balance |  | $ 302 | 311
Description |  | Gas transmission system |
Atlantic Coast Pipeline |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 48.00% |
Investment Balance |  | $ 820 | 382
Description |  | Gas transmission system |
Blue Racer |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 50.00% |
Investment Balance |  |  | 691
Description |  | Midstream gas and related services |
Fowler I Holdings LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 50.00% |
Investment Balance |  | $ 82 | 81
Description |  | Wind-powered merchant generation facility |
Other Investment |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Balance | [2] | $ 74 | 79
Dominion Energy Gas Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Balance |  | $ 91 | 95
Dominion Energy Gas Holdings, LLC | Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership% |  | 24.07% |
Investment Balance |  | $ 91 | $ 95
Description |  | Gas transmission system |
[1] | Comprised of Dominion Energy Midstream's interest of 25.93% and Dominion Energy Gas' interest of 24.07%. See Note 15 for more information.
[2] | Liability of less than $1 million and $17 million associated with NedPower recorded to other deferred credits and other liabilities, on the Consolidated Balance Sheets as of December 31, 2018 and 2017, respectively. See additional discussion of NedPower below.

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