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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] | Accounts payable | Accounts payable
Research and development expense |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset impairment charges | $ 30 |
Integration and Restructuring Expense |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset impairment charges | $ 24 | $ 83
Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Maturity period of short-term investments at the time of purchase | 3 months |
Supplier finance program, payment timing, period | 90 days |
Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Maturity period of short-term investments at the time of purchase | 1 year |
Supplier finance program, payment timing, period | 150 days |

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