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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Short-term debt    
Short-term debt, net $ 777 $ 922
Current maturities of power bonds 1,917 1,030
Current maturities of long-term debt of variable interest entities 40 39
Current maturities of notes payable 0 23
Total current debt outstanding, net 2,734 2,014
Long-term debt    
Long-term power bonds 18,057 19,225
Unamortized discounts, premiums, issues costs, and other 125 131
Total long-term debt, net 19,001 20,183
Total outstanding debt 21,735 22,197
Long-term debt of variable interest entities, net 1,069 1,089
Net exchange gain from currency transaction, current 83  
Net exchange gain from currency transaction, noncurrent 101 $ 191
Change in long-term debt $ 1,900