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Debt and Financing Arrangements - Schedule of Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Debt Disclosure [Abstract]    
2024 $ 646  
2025 508  
2026 550  
2027 731  
2028 634  
After 2028 5,429  
Total $ 8,498 $ 8,324