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Summary of Significant Accounting Policies (Details)
shares in Millions, $ in Millions
3 Months Ended
Dec. 31, 2016
USD ($)
country
shares
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]    
Number of countries in which entity operates (more than) | country 200  
Excess tax benefits $ 909 $ 698
Increase to net cash provided by operating activities 2,508 1,979
Increase in net cash used in financing activities (1,730) $ 13,534
New Accounting Pronouncement, Early Adoption, Effect    
Business Acquisition [Line Items]    
Excess tax benefits $ (26)  
Increase to diluted weighted average common shares outstanding (shares) | shares 1  
Increase to net cash provided by operating activities $ 26  
Increase in net cash used in financing activities $ (26)