Description of Company and Significant Accounting Policies (Details)	12 Months Ended
Dec. 31, 2018 USD ($) Division	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments \| Division	2
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Research and Development [Abstract]
Research and development costs	$ 390,000,000	360,000,000	329,000,000
Cash and Cash Equivalents [Abstract]
Cash equivalents, maximum maturity (in months)	3 months
Goodwill [Roll Forward]
Goodwill	$ 2,693,000,000	2,414,000,000
Current year acquisitions	105,000,000	285,000,000
Purchase price adjustments for previous acquisitions	27,000,000	(6,000,000)
Goodwill	$ 2,825,000,000	2,693,000,000	2,414,000,000
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	$ 1,922,000,000	1,679,000,000
Current year acquisitions	99,000,000	249,000,000
Purchase price adjustments for previous acquisitions	34,000,000	(6,000,000)
Goodwill	2,055,000,000	1,922,000,000	1,679,000,000
Drilling and Evaluation
Goodwill [Roll Forward]
Goodwill	771,000,000	735,000,000
Current year acquisitions	6,000,000	36,000,000
Purchase price adjustments for previous acquisitions	(7,000,000)	0
Goodwill	$ 770,000,000	$ 771,000,000	$ 735,000,000

The maximum original maturity of investments to be considered cash equivalent.

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The number of business segments into which the company's operations are divided.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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