Revenue Recognition - Summary of Revenue by Product Offering, Contract Types and Revenue Recognition Methodology (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 1,906	$ 2,063
Offshore and subsea [Member]
Disaggregation Of Revenue [Line Items]
Revenues	821	605
LNG [Member]
Disaggregation Of Revenue [Line Items]
Revenues	419	421
Downstream [Member]
Disaggregation Of Revenue [Line Items]
Revenues	522	714
Power [Member]
Disaggregation Of Revenue [Line Items]
Revenues	144	323
Fixed priced [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,572	1,599
Reimbursable [Member]
Disaggregation Of Revenue [Line Items]
Revenues	117	286
Hybrid [Member]
Disaggregation Of Revenue [Line Items]
Revenues	145	109
Unit-basis and other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	72	69
Over time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,885	2,043
At a point in time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 21	$ 20