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Investments (Financial Information Provided Equity Method Investment) (Detail) - Dominion Energy Gas Holdings, LLC - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | $ 79 | $ 112 |
Noncurrent assets | 586 | 588 |
Current liabilities | 37 | 165 |
Noncurrent liabilities | 334 | 193 |
Revenues | 180 | 194 | $ 194
Operating income | 93 | 108 | 110
Net income | 82 | 94 | 93
White River Hub LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Noncurrent assets | 39 | 41 |
Current liabilities | 2 | 2 |
Revenues | 10 | 12 | 10
Operating income | 6 | 8 | 7
Net income | $ 6 | $ 8 | $ 7

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