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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

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