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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Short-term debt |  |
Short-term debt, net | $ 819 | $ 432
Current maturities of power bonds | 1,022 | 1,022
Current maturities of long-term debt of variable interest entities | 36 | 35
Debt, Current | 1,877 | 1,489
Long-term debt |  |
Long-term power bonds | 17,986 | 17,970
Unamortized discounts, premiums, issues costs, and other | 120 | 126
Total long-term debt, net | 18,781 | 18,777
Total outstanding debt | 20,658 | 20,266
Long-term debt of variable interest entities, net | 915 | 933
Net exchange gain from currency transaction, noncurrent | $ 92 | $ 109

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