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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Short-term debt
Short-term debt, net	$ 684	$ 780
Current maturities of power bonds	1,028	1,028
Current maturities of long-term debt of variable interest entities	44	43
Total current debt outstanding, net	1,756	1,851
Long-term debt
Long-term power bonds	17,558	17,572
Unamortized discounts, premiums, issues costs, and other	110	115
Total long-term debt, net	18,432	18,463
Total outstanding debt	20,188	20,314
Long-term debt of variable interest entities, net	984	1,006
Net exchange gain from currency transaction, noncurrent	$ 71	$ 58

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