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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) (USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Short-term Debt      
Short-term debt, weighted average interest rate 0.04% 0.09% 0.00%
Short-term debt, maximum amount outstanding during period $ 3,400,000,000 $ 3,200,000,000 $ 1,400,000,000
Short-term debt, average amount outstanding $ 1,900,000,000 $ 1,100,000,000 $ 363,000,000
Weighted average interest rates during period 0.08% 0.08% 0.14%