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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