Revenues - Major Product Line (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2020	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 261	$ 4,954	$ 3,685	$ 5,744
Total Excluding Rental Revenues	261	4,954	3,685	5,744
Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	12	284	150	337
Western Hemisphere [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	121	2,620	1,586	3,063
Western Hemisphere [Member] | Production and Completions [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	69	1,357	859	1,709
Western Hemisphere [Member] | Drilling Evaluation and Intervention [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	52	975	727	1,354
Eastern Hemisphere [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	140	2,334	2,099	2,681
Eastern Hemisphere [Member] | Middle East and North Africa [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	88	1,427	1,352	1,716
Eastern Hemisphere [Member] | Production and Completions [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	67	1,263	1,020	965
Eastern Hemisphere [Member] | Drilling Evaluation and Intervention [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	$ 73	$ 1,359	$ 1,079	$ 1,716