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Financial Instruments - Summarized Information About Changes in Liabilities for Contingent Consideration (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration	$ 935	$ 891
Changes in estimated fair value	89	141
Additions	8	3
Payments	(244)	(100)
Contingent consideration	788	$ 935
Contingent consideration, liability, current	$ 89

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Amount of liability recognized arising from contingent consideration in a business combination.

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