Revenue Recognition - Summary of Revenue by Product Offering, Contract Types and Revenue Recognition Methodology (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 6,705	$ 2,985	$ 2,636
Offshore and subsea [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	2,289	2,985	2,636
LNG [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	1,309
Downstream [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1],[2]	2,224
Power [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	883
Fixed priced [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	5,239	2,895	2,425
Reimbursable [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	1,004
Hybrid [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	260
Unit-basis and other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	202	90	211
Over time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	6,628	$ 2,985	$ 2,636
At a point in time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 77

[1] Intercompany amounts have been eliminated in consolidation.

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