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Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument    
2016 $ 65  
2017 1,590  
2018 1,718  
2019 1,070  
2020 70  
Thereafter 19,611  
Total 24,124  
Foreign currency exchange loss 21 $ (44)
Unamortized discount, premiums and other 108 89
Short-term debt, net of discounts $ 1,034 $ 596