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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, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 3,931	$ 4,321	$ 3,409
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues	143	163	158
Unallocated and Other [Member] | Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Revenues	132	162	153
Unallocated and Other [Member] | By-product Sales [Member]
Segment Reporting Information [Line Items]
Revenues	5	8	8
Unallocated and Other [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues	$ 6	$ (7)	$ (3)

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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