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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Short-term debt    
Short-term debt, net $ 1,357 $ 1,167
Current maturities of power bonds 2,372 1,022
Current maturities of long-term debt of variable interest entities 46 37
Debt, Current 3,775 2,226
Long-term debt    
Long-term power bonds 16,610 17,995
Unamortized discounts, premiums, issues costs, and other 125 128
Total long-term debt, net 18,160 18,764
Total outstanding debt 21,935 20,990
Long-term debt of variable interest entities, net 1,675 897
Net exchange gain from currency transaction, noncurrent $ 96 $ 62