Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	$ 20	$ 0
Restructuring Charges | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	3	0
Restructuring Charges | Drilling and Evaluation [Member] | Operating Segments
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	5	0
Restructuring Charges | Well Construction And Completion | Operating Segments
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	7	0
Restructuring Charges | Production And Intervention | Operating Segments
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	$ 5	$ 0