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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Short-term debt    
Short-term debt, net $ 1,407 $ 1,034
Current maturities of power bonds 554 32
Current maturities of long-term debt of variable interest entities 34 33
Total current debt outstanding, net 1,995 1,099
Long-term debt    
Long-term power bonds [1] 22,217 22,792
Long-term debt of variable interest entities 1,229 1,246
Unamortized discounts, premiums, issue costs, and other (181) (188)
Total long-term debt, net 23,265 23,850
Total outstanding debt 25,260 24,949
Net exchange gain from currency transactions $ 67 $ 21
[1] Includes net exchange gain from currency transactions of $67 million at March 31, 2016 and $21 million at September 30, 2015.