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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Short-term debt      
Short-term debt, net $ 2,027   $ 1,407
Current maturities of power bonds 1,681   1,555
Current maturities of long-term debt of variable interest entities 35   35
Current maturities of notes payable 27   27
Total current debt outstanding, net 3,770   3,024
Long-term debt      
Long-term power bonds [1] 20,373   21,063
Long-term debt of variable interest entities 1,211   1,211
Long-term notes payable 48   48
Unamortized discounts, premiums, issues costs, and other (169)   (174)
Total long-term debt, net 21,463   22,148
Total outstanding debt 25,233   $ 25,172
Net exchange gain from currency transactions $ 188 $ 150  
[1] Includes net exchange gain from currency transactions of $188 million at December 31, 2016, and $150 million at September 30, 2016.