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Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2018
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
Acquisitions, net of cash acquired     $ 767 $ 38  
Entellus          
Business Acquisition [Line Items]          
Acquisitions, net of cash acquired $ 697   $ 697    
Consideration transferred (in dollars per share) $ 24.00        
NOVADAQ          
Business Acquisition [Line Items]          
Acquisitions, net of cash acquired   $ 674     $ 674