Revenues - Major Product Line (Details) - 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]
Total Revenues Excluding Rental Revenues		$ 1,369	$ 3,743	$ 4,045
Rental Revenues	$ 64	75	226	270
Total Revenues	1,314	1,444	3,969	4,315
Production
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	385	382	1,149	1,157
Completions
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	285	303	893	899
Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	311	353	936	1,024
Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	269	331	765	965
606 revenue [Member]
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	1,250	1,369	3,743	4,045
Western Hemisphere
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	634	705	1,962	2,089
Western Hemisphere | Production
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	295	293	898	887
Western Hemisphere | Completions
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	117	154	378	459
Western Hemisphere | Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	114	152	382	449
Western Hemisphere | Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	108	106	304	294
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	616	664	1,781	1,956
Eastern Hemisphere | Production
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	90	89	251	270
Eastern Hemisphere | Completions
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	168	149	515	440
Eastern Hemisphere | Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	197	201	554	575
Eastern Hemisphere | Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	$ 161	$ 225	$ 461	$ 671