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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

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