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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Short-term debt    
Short-term debt, net $ 1,034 $ 780
Current maturities of power bonds 1,029 1,028
Current maturities of long-term debt of variable interest entities 44 43
Total current debt outstanding, net 2,107 1,851
Long-term debt    
Long-term power bonds 17,491 17,572
Unamortized discounts, premiums, issues costs, and other 108 115
Total long-term debt, net 18,368 18,463
Total outstanding debt 20,475 20,314
Long-term debt of variable interest entities, net 985 1,006
Net exchange gain from currency transaction, noncurrent $ 110 $ 58