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Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Short-term debt    
Short-term debt, net $ 1,042 $ 432
Current maturities of power bonds 1,022 1,022
Current maturities of long-term debt of variable interest entities 35 35
Debt, Current 2,099 1,489
Long-term debt    
Long-term power bonds 17,990 17,970
Unamortized discounts, premiums, issues costs, and other 123 126
Total long-term debt, net 18,800 18,777
Total outstanding debt 20,899 20,266
Long-term debt of variable interest entities, net 933 933
Net exchange gain from currency transaction, noncurrent $ 88 $ 109