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Share-Based Compensation - Additional Information (Detail)
12 Months Ended
Sep. 30, 2015
USD ($)
installment
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Sep. 30, 2013
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit recognized $ 59,000,000 $ 40,000,000 $ 35,000,000
SARs vesting period 4 years    
SARs terms of award 10 years    
Total intrinsic value of SARs exercised $ 96,000,000 69,000,000 54,000,000
Stock Issued under SARs exercised | shares 691,000    
Actual tax benefit realized for tax deductions from SAR $ 34,000,000 26,000,000 19,000,000
Total fair value of SARs vested 22,000,000 25,000,000 30,000,000
Cash received from the exercising of stock options 75,000,000 17,000,000 64,000,000
Actual tax benefit realized for tax deductions from stock option exercises 20,000,000 7,000,000 21,000,000
Total intrinsic value of stock options exercised 52,000,000 $ 21,000,000 $ 65,000,000
Unrecognized compensation expense for all non-vested share-based awards $ 156,000,000    
Weighted-average remaining life non-vested share-based awards 1 year 10 months 4 days    
Shares were authorized for future grants | shares 7,242,000    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, percent deferred until retirement 25.00%    
Number of equal installments in which deferred portion of stock award is distributable (installments) | installment 5    
Period over which balance of stock award distributable 5 years    
Outstanding shares under other stock plan | shares 50,000 58,000  
Shares issuable under deferred compensation plan | shares 345,000    
Care Fusion Corporation      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense for all non-vested share-based awards $ 38,000,000    
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferral plan, shares held in trust | shares 119,000    
Shares represented Directors' compensation in 2015 | shares 3,000    
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    
Granted, stock units weighted average grant date fair value (USD per share) | $ / shares $ 148.04 $ 110.58 $ 72.14
Total fair value of restricted stock units $ 16,000,000 $ 10,000,000 $ 0
Weighted average remaining vesting term 1 year 15 days    
Awards outstanding (shares) | shares 1,139,000 1,255,000  
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    
Granted, stock units weighted average grant date fair value (USD per share) | $ / shares $ 136.30 $ 102.74 $ 70.99
Total fair value of restricted stock units $ 181,000,000 $ 45,000,000 $ 52,000,000
Weighted average remaining vesting term 1 year 1 month    
Awards outstanding (shares) | shares 3,067,000 3,015,000  
Time-Vested Restricted Stock Units | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units vesting period 1 year    
Replacement Awards | Care Fusion Corporation      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards outstanding (shares) | shares 1,500,000