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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, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 68 $ 45
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 2,626,011  
Weighted-Average Grant Date Fair Value $ 109.82  
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.