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Supplemental Financial Information - Trade Receivables, Allowances for Doubtful Accounts and Cash Discounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance $ 79 $ 81 $ 81
Additions charged to costs and expenses 132 121 109
Deductions and other (118) (124) (110)
Ending Balance 94 79 81
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance 64 65 65
Additions charged to costs and expenses 44 30 9
Deductions and other (26) (30) (10)
Ending Balance 82 64 65
Allowance for Cash Discounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance 15 16 16
Additions charged to costs and expenses 88 91 100
Deductions and other (91) (93) (100)
Ending Balance $ 11 $ 15 $ 16