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Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2020
Nov. 30, 2020
Oct. 31, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions         $ 4,304 $ 1,096  
Purchase price of acquisitions, including convertible notes   $ 5,600          
Repayments of long-term debt         $ 2,297 $ 1,342 $ 669
1.625% Convertible Notes              
Business Acquisition [Line Items]              
Stated interest rate   1.625%          
Repayments of long-term debt   $ 864          
2.25% Convertible Notes              
Business Acquisition [Line Items]              
Stated interest rate 2.25%       2.25%    
Repayments of long-term debt $ 576            
Mobius              
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions     $ 360        
OrthoSpace, Ltd.              
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions       $ 110      
Future regulatory and commercial milestones       $ 110      
Wright              
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions   $ 4,100          
Consideration transferred, price per share (in dollars per share)   $ 30.75          
Cardan Robotics              
Business Acquisition [Line Items]              
Future regulatory and commercial milestones     $ 130