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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Short-term Debt [Abstract]      
Short-term debt, net $ 1,407 $ 1,034 $ 596
Weighted Average Interest Rate 0.203% 0.055% 0.002%