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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2018
Short-term debt    
Short-term debt, net $ 1,998 $ 1,886
Current maturities of power bonds 1,728 1,032
Current maturities of long-term debt of variable interest entities 36 37
Current maturities of notes payable 53 47
Total current debt outstanding, net 3,815 3,002
Long-term debt    
Long-term power bonds [1] 20,357 20,311
Long-term debt of variable interest entities 1,175 1,156
Long-term notes payable 69 23
Unamortized discounts, premiums, issues costs, and other (163) (157)
Total long-term debt, net 21,438 21,333
Total outstanding debt 25,253 24,335
Net exchange gain from currency transactions $ 125 $ 136
[1] Includes net exchange gain from currency transactions of $136 million and $125 million at June 30, 2018, and September 30, 2017, respectively.