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Share-based Compensation - Awards Granted to Company Employees and Non-employee Directors Under the 2007 Equity Incentive Compensation Plan (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 45 $ 39
Non-qualified stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 1,671,344  
Weighted-Average Grant Date Fair Value $ 13.90  
Weighted-Average Exercise Price $ 80.82  
Restricted stock units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 2,952,720  
Weighted-Average Grant Date Fair Value $ 80.82  
Performance-bases shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted [1] 634,651  
Weighted-Average Grant Date Fair Value [1] $ 86.37  
[1] Represents the maximum number of performance-based shares which could be earned.