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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 265 $ 332 $ 177
SARs vesting period 4 years    
SARs terms of award 10 years    
Stock Issued under SARs exercised (in shares) 1,000,000.0    
Unrecognized compensation expense for all non-vested share-based awards $ 266    
Weighted-average remaining life non-vested share-based awards 1 year 10 months 28 days    
Shares were authorized for future grants 5,600,000    
Shares issuable under deferred compensation plan 320,000    
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferral plan, shares held in trust 105,000    
Performance-Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units vesting period 3 years    
Performance period 3 years    
Weighted average remaining vesting term 1 year 2 months 19 days    
Performance-Based Restricted Stock Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance payout, percent 0.00%    
Performance-Based Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance payout, percent 200.00%    
Time-Vested Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units vesting period 3 years    
Weighted average remaining vesting term 10 months 24 days    
Time-Vested Restricted Stock Units | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units vesting period 1 year    
Acquisitions and other restructurings      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 50 130 $ 10
Acquisitions and other restructurings | CR Bard Inc      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 40 $ 126