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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Debt Instrument    
Foreign Currency Transaction Gain (Loss), before Tax $ (14) $ (44)
Short-term debt    
Short-term debt, net 2,582 596
Current maturities of long-term debt of variable interest entities 33 32
Current maturities of power bonds 32 1,032
Total current debt outstanding, net 2,647 1,660
Long-term debt    
Long-term debt of variable interest entities 1,263 1,279
Long-term power bonds [1] 21,827 22,037
Unamortized discounts, premiums and other (83) (89)
Total long-term debt, net 23,007 23,227
Total outstanding debt $ 25,654 $ 24,887
[1] Includes net exchange losses from currency transactions of $14 million at June 30, 2015 and $44 million at September 30, 2014.