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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Short-term debt    
Short-term debt, net $ 351 $ 1,167
Current maturities of power bonds 2,372 1,022
Current maturities of long-term debt of variable interest entities 47 37
Debt, Current 2,770 2,226
Long-term debt    
Long-term power bonds 17,876 17,995
Unamortized discounts, premiums, issues costs, and other 147 128
Total long-term debt, net 19,385 18,764
Total outstanding debt 22,155 20,990
Long-term debt of variable interest entities, net 1,656 897
Net exchange gain from currency transaction, noncurrent $ 80 $ 62