Revenue Recognition - Summary of Revenue by Product Offering, Contract Types and Revenue Recognition Methodology (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 2,121	$ 2,289	$ 6,469	$ 4,632
Offshore and subsea [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	728	548	1,994	1,809
LNG [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	334	553	1,166	935
Downstream [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1],[2]	854	860	2,456	1,356
Power [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	205	328	853	532
Fixed priced [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	1,640	1,797	5,230	3,693
Reimbursable [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	324	411	733	680
Hybrid [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	93	10	309	134
Unit-basis and other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	64	71	197	125
Over time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	2,076	2,249	6,354	4,564
At a point in time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 45	$ 40	$ 115	$ 68

[1] Intercompany amounts have been eliminated in consolidation.

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