Joint Venture and Consortium Arrangements - Summarized Balance Sheet Information for Proportionately Consolidated Consortiums (Detail) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Current assets		$ 3,521	$ 1,435
Total assets	[1]	11,428	3,223
Current liabilities		3,769	$ 707
Proportionately Consolidated Joint Ventures [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Current assets	[2],[3]	382
Non-current assets	[2]	8
Total assets	[2]	390
Current liabilities	[2]	$ 433

[1] Our marine vessels are included in the area in which they were located as of the reporting date.

[2] All balances at June 30, 2018 resulted from the Combination and are subject to change when additional information is obtained during the measurement period.

[3] 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. At June 30, 2018, Accounts receivable-other included $43 million related to our proportionate share of advances from the consortiums to the consortium participants.