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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
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation [Abstract]    
Share-based Compensation $ 242 $ 183
Non-qualified stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 1,622,760  
Weighted-Average Grant Date Fair Value $ 17.88  
Weighted-Average Exercise Price $ 109.82  
Restricted stock units (“RSUs”)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 2,776,303  
Weighted-Average Grant Date Fair Value $ 110.57  
Performance-bases shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted [1] 641,498  
Weighted-Average Grant Date Fair Value [1] $ 120.11  
[1] Represents the maximum number of performance-based shares which could be earned.