Joint Venture and Consortium Arrangements - Summary of Aggregate Financial Information (Detail) - CLG and McDermott/CTCI [Member] - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2018
Schedule Of Equity Method Investments [Line Items]
Revenues		$ 237	$ 400
Cost of operations		221	363
Gross profit		16	37
Operating income		9	23
Net income	[1]	$ 11	$ 24

[1] Results for CLG and McDermott/CTCI are from the Combination Date.