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Debt and Other Obligations Debt Outstanding (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Short-term debt    
Short-term debt, net $ 2,395 $ 1,507
Current maturities of long-term debt of variable interest entities 13 13
Current maturities of power bonds 972 2,308
Total current debt outstanding, net 3,380 3,828
Long-term debt    
Long-term debt of variable interest entities 975 981
Long-term power bonds 21,296 20,330
Unamortized discounts, premiums and other (82) (61)
Total long-term debt, net 22,189 21,250
Total outstanding debt $ 25,569 $ 25,078