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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 2,137	$ 1,735	$ 4,348	$ 2,343
Offshore and subsea [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	661	653	1,266	1,261
LNG [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	411	382	832	382
Downstream [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1],[2]	740	496	1,602	496
Power [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	325	204	648	204
Fixed priced [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	1,864	1,313	3,590	1,896
Reimbursable [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	106	269	409	269
Hybrid [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	106	124	216	124
Unit-basis and other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	61	29	133	54
Over time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	2,117	1,707	4,278	2,315
At a point in time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 20	$ 28	$ 70	$ 28

[1] Intercompany amounts have been eliminated in consolidation.

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