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Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2030
Sep. 30, 2029
Sep. 30, 2028
Sep. 30, 2027
Sep. 30, 2026
Debt Instrument              
2018 $ 1,022            
2019 1,370            
2020 1,020            
2021 1,272            
2022 220            
Thereafter 14,175            
Total 19,079            
Short-Term Debt 1,167 $ 432          
Net discount on sale of Bonds 87            
Foreign Currency Transaction Gain (Loss), Unrealized 62 $ 109          
Scenario, Forecast              
Debt Instrument              
Short-Term Debt     $ 0 $ 0 $ 0 $ 0 $ 0
Power bonds              
Debt Instrument              
Debt issuance costs $ 41