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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Dec. 13, 2019
€ / shares
Dec. 13, 2019
$ / shares
Nov. 30, 2019
USD ($)
$ / shares
Oct. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions           $ 23 $ 308
Acquisitions, net of cash acquired           $ 23 $ 180
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