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Segment Information - Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Geographic Area Information [Line Items]
Net sales	$ 23,596	$ 22,952	$ 22,331
Long-Lived Assets (Year-end)	2,193	2,403	2,374
United States
Geographic Area Information [Line Items]
Net sales	13,303	13,171	12,408
Long-Lived Assets (Year-end)	1,108	1,137	1,277
Other Non-United States
Geographic Area Information [Line Items]
Net sales	10,293	9,781	9,923
Long-Lived Assets (Year-end)	$ 1,085	$ 1,266	$ 1,097

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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