Revenue Recognition - Summary of Revenue by Product Offering, Contract Types and Revenue Recognition Methodology (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	$ 1,735	$ 789	$ 2,343	$ 1,308
Downstream [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1],[2]	496		496
Power [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	204		204
Offshore and subsea [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	653	789	1,261	1,308
LNG [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	382		382
Fixed priced [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	1,313	786	1,896	1,262
Hybrid [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	124		124
Reimbursable [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	269		269
Unit-basis and other [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	29	3	54	46
Over time [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	1,707	$ 789	2,315	$ 1,308
At a point in time [Member]
Disaggregation Of Revenue [Line Items]
Revenue Disaggregation	[1]	$ 28		$ 28

[1] Includes the results of our Technology operating group.

[2] Intercompany amounts have been eliminated in consolidation.