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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Short-term debt |  |
Short-term debt, net | $ 1,066 | $ 780
Current maturities of power bonds | 1,028 | 1,028
Current maturities of long-term debt of variable interest entities | 43 | 43
Total current debt outstanding, net | 2,137 | 1,851
Long-term debt |  |
Long-term power bonds | 17,573 | 17,572
Unamortized discounts, premiums, issues costs, and other | 112 | 115
Total long-term debt, net | 18,467 | 18,463
Total outstanding debt | 20,604 | 20,314
Long-term debt of variable interest entities, net | 1,006 | 1,006
Net exchange gain from currency transaction, noncurrent | $ 56 | $ 58

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