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Acquisitions - Fair Value of Consideration Transferred (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]        
Noncash consideration-fair value of shares issued   $ 8,004 $ 0 $ 0
Noncash consideration-fair value of stock options and other equity awards   $ 613 $ 0 $ 0
CR Bard Inc [Member]        
Business Acquisition [Line Items]        
Cash consideration $ 16,400      
Noncash consideration-fair value of shares issued 8,004      
Noncash consideration-fair value of stock options and other equity awards 613      
Total consideration transferred $ 25,017