Use of Estimates - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Project	Mar. 31, 2015 USD ($) Project
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	$ 40	$ 22
AEA [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	16	7
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
Number of projects | Project	2
AEA [Member] | Subsea Project [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results		4
MEA [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	$ 7	$ 9
Number of projects | Project		2
MEA [Member] | EPCI project two Saudi Arabia [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results		$ 7
MEA [Member] | EPCI project two Saudi Arabia [Member] | Project Two
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results		6
MEA [Member] | EPCI projects Saudi Arabia [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results		(5)
ASA [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Effect of changes in estimated project cost on operating results	$ 17	$ 6