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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