Revenues - Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Operating Leases, Income Statement, Lease Revenue	$ 30	$ 64	$ 119	$ 226
Disaggregation of Revenue [Line Items]
Revenue	807	1,314	2,843	3,969
Western Hemisphere
Disaggregation of Revenue [Line Items]
Revenue	316	675	1,214	2,120
Western Hemisphere | Production and Completions [Member]
Disaggregation of Revenue [Line Items]
Revenue	170	348	632	1,098
Western Hemisphere | Drilling Evaluation and Intervention [Member]
Disaggregation of Revenue [Line Items]
Revenue	146	327	582	1,022
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Revenue	491	639	1,629	1,849
Eastern Hemisphere | Production and Completions [Member]
Disaggregation of Revenue [Line Items]
Revenue	241	265	783	792
Eastern Hemisphere | Drilling Evaluation and Intervention [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 250	$ 374	$ 846	$ 1,057