Debt - Summary of Short-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Short-term Debt [Line Items]
Other short-term borrowings	$ 1	$ 0
Current debt obligations	2,170	1,141
Commercial Paper
Short-term Debt [Line Items]
Short-term debt	$ 400	0
3.875% Notes due May 15, 2024
Short-term Debt [Line Items]
Interest rate (percent)	3.875%
Current portion of long-term debt	$ 0	144
3.363% Notes due June 6, 2024
Short-term Debt [Line Items]
Interest rate (percent)	3.363%
Current portion of long-term debt	$ 0	997
3.734% Notes due December 15, 2024
Short-term Debt [Line Items]
Interest rate (percent)	3.734%
Current portion of long-term debt	$ 875	0
3.020% Notes due May 24, 2025
Short-term Debt [Line Items]
Interest rate (percent)	3.02%
Current portion of long-term debt	$ 335	0
0.034% Notes due August 13, 2025
Short-term Debt [Line Items]
Interest rate (percent)	0.034%
Current portion of long-term debt	$ 559	$ 0

Amount of debt and lease obligation, classified as current.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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