Use of Estimates - Additional Information (Detail) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) Jacket	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($) Jacket Project	Jun. 30, 2016 USD ($) Project	Dec. 31, 2016 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results			$ 28	$ 79	$ 68
MEA and ASA Segments [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	$ 32
AEA [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	4	$ 7		1	$ 23
Number of projects | Project					2
AEA [Member] | PB Litoral project [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results					$ 7
MEA [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	$ 20		10	$ 36	17
Number of Jackets Saudi Aramco project | Jacket	9			9
Number of projects | Project				2
ASA [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	$ 16		$ 11	$ 42	$ 28
ASA [Member] | Ichthys Project [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results						$ 34
ASA [Member] | Ichthys Project [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of additional estimated project costs On Income						$ 10