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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Aug. 31, 2019
USD ($)
Loss Contingencies [Line Items]          
Rental expense for operating leases   $ 169 $ 149 $ 110  
Aggregate future purchase commitments   1,364      
Loss Contingency Accrual   2,500 2,000    
QualifiedSettlementFunds   53 94    
Loss Contingency, Receivable   150 $ 343    
Other Operating Income (Expense)          
Loss Contingencies [Line Items]          
Product Liability Accrual, Period Expense   $ 914      
HerniaProductClaims          
Loss Contingencies [Line Items]          
Loss Contingency, Pending Claims, Number   12,040      
WomensHealthProductClaims          
Loss Contingencies [Line Items]          
Loss Contingency, Pending Claims, Number   885      
ClaimsLackingSufficientInformation   1,010      
NumberOfClaimsInSettlementAgreement   15,160      
Damages awarded $ 68        
PaymentstoSupplier   $ 121     $ 20
WomensHealthProductClaims | Compensatory          
Loss Contingencies [Line Items]          
Damages awarded 33        
WomensHealthProductClaims | Punitive          
Loss Contingencies [Line Items]          
Damages awarded $ 35        
FilterProductClaims          
Loss Contingencies [Line Items]          
Loss Contingency, Pending Claims, Number   4,485      
Loss Contingency, Claims Settled, Number   4,200