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Investments (Financial Information Provided Equity Method Investment) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Iroquois |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | $ 112 | $ 122 |
Noncurrent assets | 588 | 599 |
Current liabilities | 165 | 21 |
Noncurrent liabilities | 193 | 334 |
Revenues | 194 | 194 | $ 195
Operating income | 108 | 110 | 103
Net income | 94 | 93 | 86
White River Hub LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | 3 | 3 |
Noncurrent assets | 41 | 42 |
Current liabilities | 2 | 1 |
Revenues | 12 | 10 | 3
Operating income | 8 | 7 | 2
Net income | $ 8 | $ 7 | $ 2

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