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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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Amount of debt and lease obligation, classified as current.

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