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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

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