Joint Venture and Consortium Arrangements - Summarized Balance Sheet Information for Consolidated Joint Venture (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Current assets	$ 3,555	$ 3,033
Total assets	8,737	9,440
Current liabilities	9,444	4,217
Variable Interest Entities ("VIEs") [Member]
Variable Interest Entity [Line Items]
Current assets	39	102
Non-current assets	16	15
Total assets	55	117
Current liabilities	$ 120	$ 138