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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Short-term debt    
Short-term debt, net $ 1,504 $ 1,034
Current maturities of long-term debt of variable interest entities 33 33
Current maturities of power bonds 554 32
Total current debt outstanding, net 2,091 1,099
Long-term debt    
Long-term debt of variable interest entities 1,246 1,246
Long-term power bonds [1] 22,242 22,792
Unamortized discounts, premiums, issue costs, and other (184) (188)
Total long-term debt, net 23,304 23,850
Total outstanding debt 25,395 24,949
Foreign Currency Transaction Gain (Loss), before Tax $ 44 $ 21
[1] Includes net exchange gain from currency transactions of $44 million at December 31, 2015 and $21 million at September 30, 2015.