Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Accrued Liabilities Current [Abstract]
Accrued contract costs		$ 716	$ 141
Advances from equity method and proportionally consolidated joint ventures and consortiums	[1]	147
Income taxes payable		143	35
Other accrued liabilities	[2]	573	196
Accrued liabilities		$ 1,579	$ 372

[1] Represents advances from the joint ventures and consortiums in which we participate. See Note 10, Joint Venture and Consortium Arrangements for further discussion.

[2] Represents various accruals that are each individually less than 5% of total current liabilities.