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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended				9 Months Ended
	Nov. 30, 2019 USD ($) $ / shares	Nov. 30, 2019 € / shares	Oct. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Aggregate purchase price of acquisitions					$ 26	$ 446
Acquisitions, net of cash acquired					$ 26	$ 281
Mobius
Business Acquisition [Line Items]
Aggregate purchase price of acquisitions			$ 360
Future milestone payments			$ 130
OrthoSpace, Ltd.
Business Acquisition [Line Items]
Aggregate purchase price of acquisitions				$ 110
Future milestone payments				$ 110
Wright
Business Acquisition [Line Items]
Consideration transferred (in dollars per share) | $ / shares	$ 30.75
Acquisitions, net of cash acquired	$ 5,400
Par value of ordinary shares of acquiree (in EUR per share) | € / shares		€ 0.03

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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