Revenues - Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues		$ 1,335	$ 2,493	$ 2,676
Rental Revenues	$ 84	113	162	195
Total Revenues	1,309	1,448	2,655	2,871
Production
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	373	394	764	775
Completions
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	303	303	608	596
Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	299	321	625	671
Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	250	317	496	634
606 revenue [Member]
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	1,225	1,335	2,493	2,676
Western Hemisphere
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	659	684	1,328	1,384
Western Hemisphere | Production
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	308	308	603	594
Western Hemisphere | Completions
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	128	148	261	305
Western Hemisphere | Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	126	141	268	297
Western Hemisphere | Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	97	87	196	188
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	566	651	1,165	1,292
Eastern Hemisphere | Production
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	65	86	161	181
Eastern Hemisphere | Completions
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	175	155	347	291
Eastern Hemisphere | Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	173	180	357	374
Eastern Hemisphere | Well Construction
Disaggregation of Revenue [Line Items]
Total Revenues Excluding Rental Revenues	$ 153	$ 230	$ 300	$ 446