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Debt and Other Obligations Debt Outstanding (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2003
Units
Debt Instrument      
Foreign Currency Transaction Gain (Loss), before Tax $ 98 $ 43  
Proceeds prior to 2004     945
Leaseback transaction, number of units     24
Proceeds in 2003     389
CT and QTE outstanding leaseback obligation 692 761  
Short-term debt      
Short-term debt, net 1,759 2,432  
Current maturities of long-term debt of variable interest entities 31 30  
Current maturities of power bonds 1,032 32  
Total current debt outstanding, net 2,822 2,494  
Long-term debt      
Long-term debt of variable interest entities 1,295 1,311  
Long-term power bonds 21,092 [1] 22,400 [1]  
Unamortized discounts, premiums and other (80) (85)  
Total long-term debt, net 22,307 23,626  
Total outstanding debt $ 25,129 $ 26,120  
[1] Includes net exchange losses from currency transactions of $98 million at June 30, 2014 and $43 million at September 30, 2013.