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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
SARs vesting period 4 years  
SARs terms of award 10 years  
Stock Issued under SARs exercised 793,000  
Unrecognized compensation expense for all non-vested share-based awards $ 182  
Weighted-average remaining life non-vested share-based awards 1 year 11 months 4 days  
Shares were authorized for future grants 8,800,000  
Outstanding shares under other stock plan 29,000 43,000
Shares issuable under deferred compensation plan 338,000  
Director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Deferral plan, shares held in trust 130,000  
Shares represented Directors' compensation in 2015 1,000  
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 18 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 1 year  
Time-Vested Restricted Stock Units | Executive Officer    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock units vesting period 1 year