Joint Venture and Consortium Arrangements - Summarized Balance Sheet Information for Consolidated Joint Ventures (Detail) $ in Millions	Dec. 31, 2018 USD ($)	[1]
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Current assets	$ 102
Non-current assets	15
Total assets	117
Current liabilities	$ 138

[1] All balances at December 31, 2018 resulted from the Combination and are subject to change when additional information is obtained during the measurement period.