Joint Venture and Consortium Arrangements - Summarized Balance Sheet Information for Proportionately Consolidated Consortiums (Detail) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Current assets		$ 3,239	$ 3,033
Total assets		10,029	9,440
Current liabilities		4,618	4,217
Proportionately Consolidated Joint Ventures [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Current assets	[1]	377	299
Non-current assets		11	10
Total assets		388	309
Current liabilities		$ 816	$ 992

[1] Our consortium arrangements allow for excess working capital of the consortium to be advanced to the consortium participants. Such advances are returned to the ventures for working capital needs as necessary. Accordingly, at a reporting period end a consortium may have advances to its participants which are reflected as an advance receivable within current assets of the consortium. As of March 31, 2019 and December 31, 2018, Accounts receivable-other included $33 million and $44 million, respectively, related to our proportionate share of advances from the consortiums to the other consortium participants