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Acquisitions Acquisition - Fair Value of Company's Ordinary Shares Issued (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 29, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]        
Fair value of the Company’s issued shares   $ 8,004 $ 0 $ 0
CR Bard Inc [Member]        
Business Acquisition [Line Items]        
Total Bard shares outstanding 73,359,000      
Conversion factor 0.5077      
Conversion of Bard shares outstanding 37,243,000      
Conversion of pre-acquisition equity awards 104,000      
Total number of the Company's share issued 37,347,000      
Closing price of the Company’s stock $ 214.32      
Fair value of the Company’s issued shares $ 8,004