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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions			1 Months Ended			6 Months Ended
	Dec. 13, 2019 $ / shares	Dec. 13, 2019 € / shares	Nov. 30, 2019 USD ($) $ / shares	Oct. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Aggregate purchase price of acquisitions						$ 26	$ 425
Acquisitions, net of cash acquired						$ 26	$ 260
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		$ 30.75
Acquisitions, net of cash acquired			$ 5,400
Par value of ordinary shares of acquiree (in dollars 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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