Revenues - Major Product Line (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 261	$ 985	$ 1,314	$ 1,309	$ 1,346	$ 1,429	$ 1,444	$ 1,448	$ 1,423	$ 4,954	$ 4,954	$ 5,744	$ 5,699
Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	12									284		337
Production [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	82									1,471		1,559	1,465
Completion [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	66									1,120		1,214	1,265
Drilling and Evaluation [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	57									1,193		1,425	1,390
Well Construction [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	56									1,170		1,546	1,579
606 revenue [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	261									4,954		5,744	5,699
Western Hemisphere [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	121									2,620		3,063	2,937
Western Hemisphere [Member] | Production [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	56									1,132		1,195	1,085
Western Hemisphere [Member] | Completion [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	22									468		610	641
Western Hemisphere [Member] | Drilling and Evaluation [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	21									498		647	623
Western Hemisphere [Member] | Well Construction [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	22									522		611	588
Eastern Hemisphere [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	140									2,334		2,681	2,762
Eastern Hemisphere [Member] | Production [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	26									339		364	380
Eastern Hemisphere [Member] | Completion [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	44									652		604	624
Eastern Hemisphere [Member] | Drilling and Evaluation [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	36									695		778	767
Eastern Hemisphere [Member] | Well Construction [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	$ 34									$ 648		$ 935	$ 991