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Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Compensation and benefits, assets	$ 431	$ 405
Property and equipment, liabilities	359	391
Intangibles, liabilities	1,324	1,612
Loss and credit carryforwards, assets	3,476	2,954
Product recall and liability reserves, assets	180	261
Capitalized research and development expenses, assets	446	364
Other, assets	638	504
Other, liabilities	89	64
Deferred income taxes, assets, gross	5,171	4,489
Deferred income taxes, liabilities, gross	1,771	2,067
Valuation allowance, assets	(3,431)	(2,990)
Deferred income taxes, assets	1,740	1,498
Deferred income taxes, liabilities	$ 1,771	$ 2,067

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Deferred Tax Assets, Tax Deferred Expense, Capitalized Research And Development Costs

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