XML 75 R72.htm IDEA: XBRL DOCUMENT v2.4.0.8
Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) (USD $)
In Billions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Short-term Debt      
Short-term debt, weighted average interest rate   0.04% 0.09%
Short-term debt, maximum amount outstanding during period $ 2.4 $ 3.4 $ 3.2
Short-term debt, average amount outstanding $ 1.7 $ 1.9 $ 1.1
Weighted average interest rates during period 0.05% 0.08% 0.08%