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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 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Non-qualified stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted     1,109,645  
Weighted-Average Grant Date Fair Value     $ 25.89  
Weighted-Average Exercise Price     $ 134.76  
Restricted stock units (“RSUs”)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted     2,616,550  
Weighted-Average Grant Date Fair Value     $ 135.19  
Performance-bases shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted [1]     540,538  
Weighted-Average Grant Date Fair Value [1]     $ 153.42  
Equity Incentive Compensation Plan, 2007        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 106 $ 82 $ 201 $ 146
[1] Represents the maximum number of performance-based shares which could be earned.