Revenues - Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Rental Revenues	$ 57		$ 78
Disaggregation of Revenue [Line Items]
Total Revenues	1,215		1,346
Total Revenues	1,215	$ 1,215	1,346	$ 1,346
Production
Disaggregation of Revenue [Line Items]
Total Revenues			399
Total Revenues	353
Completions
Disaggregation of Revenue [Line Items]
Total Revenues			306
Total Revenues	314
Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues			336
Total Revenues	281
Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues			305
Total Revenues	267
Western Hemisphere
Disaggregation of Revenue [Line Items]
Total Revenues	588	588	726	726
Western Hemisphere | Production
Disaggregation of Revenue [Line Items]
Total Revenues	257		299
Western Hemisphere | Completions
Disaggregation of Revenue [Line Items]
Total Revenues	109		133
Western Hemisphere | Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues	113		152
Western Hemisphere | Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues	109		142
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Total Revenues	627	$ 627	620	$ 620
Eastern Hemisphere | Production
Disaggregation of Revenue [Line Items]
Total Revenues	96		100
Eastern Hemisphere | Completions
Disaggregation of Revenue [Line Items]
Total Revenues	205		173
Eastern Hemisphere | Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues	168		184
Eastern Hemisphere | Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues	$ 158		$ 163