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Financial Information by Segment & Geographic Area - Sales of Equity Method Affiliate, Discounting Charges for Certain Notes Receivable, by- productive Revenue, Indirect Tax Settlement Credits, and Insurance Recoveries (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 3,713	$ 3,994	$ 3,931
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues	122	134	143
Unallocated and Other [Member] | Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Revenues	112	123	132
Unallocated and Other [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues	$ 10	$ 11	$ 11

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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