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Debt - Summary of Short-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Short-term Debt [Line Items]
Other short-term borrowings	$ 1	$ 1
Current debt obligations	1,560	2,170
Commercial Paper
Short-term Debt [Line Items]
Short-term debt	$ 855	400
3.734% Notes due December 15, 2024
Short-term Debt [Line Items]
Interest rate (percent)	3.734%
Current portion of long-term debt	$ 0	875
3.020% Notes due May 24, 2025
Short-term Debt [Line Items]
Interest rate (percent)	3.02%
Current portion of long-term debt	$ 0	335
0.034% Notes due August 13, 2025
Short-term Debt [Line Items]
Interest rate (percent)	0.034%
Current portion of long-term debt	$ 0	559
1.208% Notes due June 4, 2026
Short-term Debt [Line Items]
Interest rate (percent)	1.208%
Current portion of long-term debt	$ 704	$ 0

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Amount of debt and lease obligation, classified as current.

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Contractual interest rate for funds borrowed, under the debt agreement.

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