Revenue Recognition - Additional Information (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues recognized due to changes in transaction price	[1]	$ 2,211,000,000	$ 608,000,000
Advance billings on contracts				$ 768,000,000
Unapproved change orders and claims		297,000,000		428,000,000
Unapproved change orders and claims in our RPO balance		93,000,000		130,000,000
Incentives amount included in transaction prices		16,000,000		0
Incentives amount included in our RPO balance		$ 1,000,000
Estimated percentage of in progress as of combination date		0.00%
Effect of changes in estimated project cost on operating results			37,000,000
Uncompleted Contracts [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 190,000,000		$ 266,000,000
NCSA [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues recognized due to changes in transaction price		22,000,000
Effect of changes in estimated project cost on operating results		24,000,000
NCSA [Member] | Cameron Liquefied Natural Gas Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 128,000,000
Percentage of complete acquired on post combination basis		65.00%
Percentage of complete acquired on pre combination basis		90.00%
NCSA [Member] | Freeport LNG Trains 1 and 2 Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 19,000,000
Percentage of complete acquired on post combination basis		80.00%
Percentage of complete acquired on pre combination basis		95.00%
Effect of changes in estimated project cost on operating results		$ 27,000,000
Partial offset on estimated costs on project		11,000,000
NCSA [Member] | Freeport LNG Train 3 Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Effect of changes in estimated project cost on operating results		$ 16,000,000
NCSA [Member] | Calpine Power Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Percentage of complete acquired on post combination basis		95.00%
Percentage of complete acquired on pre combination basis		99.00%
APAC [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues recognized due to changes in transaction price			66,000,000
Effect of changes in estimated project cost on operating results		$ 6,000,000	$ 9,000,000
Pemex [Member] | Abkatun-A2 Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Percentage of project acquired complete		95.00%

[1] Intercompany amounts have been eliminated in consolidation.