Restructuring Charges (Restructuring Charges by Segment) (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 189	$ 0	$ 206
Drilling and Evaluation
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	29	0	35
Well Construction and Completions
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	47	0	60
Production and Intervention
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	54	0	52
Corporate and Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 59	$ 0	$ 59