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Segment Data - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of principal business segments (segment) | segment   3  
Inventory recall expense   $ 65  
Gain (loss) on disposition of business   336 $ 0
Gain on Sale of Investments $ 308 0 308
Advanced Bioprocessing      
Segment Reporting Information [Line Items]      
Gain (loss) on disposition of business   336  
Other Operating Income (Expense)      
Segment Reporting Information [Line Items]      
Product liability accrual, period expense   $ 331  
CR Bard Inc      
Segment Reporting Information [Line Items]      
Recognition of fair value adjustment to inventory acquired 478   478
CR Bard Inc | Medical      
Segment Reporting Information [Line Items]      
Recognition of fair value adjustment to inventory acquired 7   60
CR Bard Inc | Interventional      
Segment Reporting Information [Line Items]      
Recognition of fair value adjustment to inventory acquired $ 49   $ 418