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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Short-term debt      
Short-term debt, net $ 2,721   $ 1,998
Current maturities of power bonds 2,031   1,728
Current maturities of long-term debt of variable interest entities 36   36
Current maturities of notes payable 52   53
Total current debt outstanding, net 4,840   3,815
Long-term debt      
Long-term power bonds [1] 19,362   20,357
Long-term debt of variable interest entities 1,175   1,175
Long-term notes payable 68   69
Unamortized discounts, premiums, issues costs, and other (159)   (163)
Total long-term debt, net 20,446   21,438
Total outstanding debt 25,286   $ 25,253
Net exchange gain from currency transactions $ 118 $ 125  
[1] Includes net exchange gain from currency transactions of $118 million at December 31, 2017, and $125 million at September 30, 2017.