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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Short-term debt |  |
Short-term debt, net | $ 1,241 | $ 57
Current maturities of power bonds | 304 | 1,787
Current maturities of long-term debt of variable interest entities | 42 | 41
Total current debt outstanding, net | 1,587 | 1,885
Long-term debt |  |
Long-term power bonds | 18,112 | 18,078
Unamortized discounts, premiums, issues costs, and other | 117 | 122
Total long-term debt, net | 19,023 | 19,004
Total outstanding debt | 20,610 | 20,889
Long-term debt of variable interest entities, net | 1,028 | 1,048
Net exchange gain from currency transaction, current | 56 | 73
Net exchange gain from currency transaction, noncurrent | $ 46 | $ 80

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