Description of Company and Significant Accounting Policies (Details)	3 Months Ended			12 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Division	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments | Division				2
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Research and Development [Abstract]
Research and development costs				$ 309,000,000	404,000,000	390,000,000
Cash and Cash Equivalents [Abstract]
Cash equivalents, maximum maturity (in months)				3 months
Goodwill [Roll Forward]
Goodwill			2,812,000,000	$ 2,812,000,000	2,825,000,000
Current year acquisitions					11,000,000
Purchase price adjustments for previous acquisitions					(2,000,000)
Other				(8,000,000)	(22,000,000)
Goodwill				$ 2,804,000,000	2,812,000,000	2,825,000,000
Minimum
Finite-lived intangible assets [Abstract]
Useful life of finite-lived intangible assets (in years)				1 year
Maximum
Finite-lived intangible assets [Abstract]
Useful life of finite-lived intangible assets (in years)				28 years
Completion and Production
Goodwill [Roll Forward]
Goodwill			2,039,000,000	$ 2,039,000,000	2,055,000,000
Current year acquisitions					6,000,000
Purchase price adjustments for previous acquisitions					(1,000,000)
Other				(66,000,000)	(21,000,000)
Goodwill				1,973,000,000	2,039,000,000	2,055,000,000
Drilling and Evaluation
Goodwill [Roll Forward]
Goodwill			$ 773,000,000	773,000,000	770,000,000
Current year acquisitions					5,000,000
Purchase price adjustments for previous acquisitions					(1,000,000)
Other				58,000,000	(1,000,000)
Goodwill				$ 831,000,000	$ 773,000,000	$ 770,000,000