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Supplemental Financial Information - Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Materials $ 860 $ 803
Work in process 490 443
Finished products 2,544 2,597
Inventories $ 3,894 $ 3,843