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Share-Based Compensation - Compensation Cost Relating to Share-Based Payments (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation cost | $ 262 | $ 249 | $ 261
Tax benefit associated with share-based compensation costs recognized | 60 | 58 | 58
Cost of products sold |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation cost | 53 | 51 | 50
Selling and administrative expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation cost | 160 | 156 | 170
Research and development expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation cost | 44 | 42 | 41
Integration and Restructuring Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation cost | $ 5 | $ 0 | $ 0

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