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Share-Based Compensation - Compensation Cost Relating to Share-Based Payments (Details) - USD ($) $ in Millions	12 Months Ended
	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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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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