Revenue Recognition - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues recognized due to changes in transaction price	[1]	$ 2,137,000,000		$ 1,735,000,000	$ 4,348,000,000	$ 2,343,000,000
Revenue included from settlement of claims		72,000,000			72,000,000
Advance billings on contracts		579,000,000			1,300,000,000
Unapproved change orders and claims		388,000,000			388,000,000		$ 428,000,000
Unapproved change orders and claims in our RPO balance		101,000,000			101,000,000		130,000,000
Incentives amount included in transaction prices		126,000,000			126,000,000		0
Incentives amount included in our RPO balance		$ 25,000,000			$ 25,000,000
Estimated percentage of in progress as of combination date		0.00%			0.00%
Effect of changes in estimated project cost on operating results				84,000,000		121,000,000
Uncompleted Contracts [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 132,000,000			$ 132,000,000		$ 266,000,000
Freeport LNG Train 3 Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Effect of changes in estimated project cost on operating results					38,000,000
NCSA [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues recognized due to changes in transaction price		74,000,000			96,000,000
Effect of changes in estimated project cost on operating results		131,000,000			155,000,000
NCSA [Member] | Cameron Liquefied Natural Gas Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 58,000,000			$ 58,000,000
Percentage of complete acquired on post combination basis		78.00%			78.00%
Percentage of complete acquired on pre combination basis		93.00%			93.00%
Revenue recognized achievement of progress milestones		$ 110,000,000
NCSA [Member] | Line 1 and Line 10 project for Pemex [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 6,000,000			$ 6,000,000
Percentage of completion		85.00%			85.00%
Effect of changes in estimated project cost on operating results		$ 10,000,000			$ 28,000,000
NCSA [Member] | Freeport LNG Trains 1 and 2 Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Provisions for estimated losses		$ 19,000,000			$ 19,000,000
Percentage of complete acquired on post combination basis		87.00%			87.00%
Percentage of complete acquired on pre combination basis		96.00%			96.00%
Effect of changes in estimated project cost on operating results		$ 27,000,000			$ 54,000,000
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		$ 11,000,000			$ 5,000,000
NCSA [Member] | Calpine Power Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Percentage of complete acquired on post combination basis		99.00%			99.00%
Percentage of complete acquired on pre combination basis		99.70%			99.70%
Effect of changes in estimated project cost on operating results		$ 11,000,000			$ 11,000,000
APAC [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues recognized due to changes in transaction price				$ 13,000,000		$ 79,000,000
Pemex [Member] | Abkatun-A2 Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Percentage of project acquired complete		99.00%			99.00%

[1] Intercompany amounts have been eliminated in consolidation.