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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Short-term debt    
Short-term debt, net $ 722 $ 1,172
Current maturities of power bonds 22 29
Current maturities of long-term debt of variable interest entities 35 39
Total current debt outstanding, net 779 1,240
Long-term debt    
Long-term power bonds 18,990 17,950
Unamortized discounts, premiums, issues costs, and other 129 124
Total long-term debt, net 19,812 18,794
Total outstanding debt 20,591 20,034
Long-term debt of variable interest entities, net 951 968
Net exchange gain from currency transaction, noncurrent $ 89 $ 150