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Debt and Other Obligations - Schedule of Long-Term Obligations (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Total variable rate debt	$ 120	$ 114
Medium Term Notes	8	8
Debt	1,082
Total debt	962	962
Finance lease obligations (Note R)	28	29
Unamortized debt issuance costs and debt discount	(8)	(9)
Total debt	1,102	1,096
Less current portion of long-term debt	(8)	(7)
Total long-term debt	1,094	1,089
Revolving Credit Facility - Euro, expires fiscal 2027 [Member]
Debt Instrument [Line Items]
Line of credit	120	114
3.4% Notes due fiscal 2026 [Member]
Debt Instrument [Line Items]
Notes	250	250
4.0% Notes due fiscal 2029 [Member]
Debt Instrument [Line Items]
Notes	300	300
5.0% Notes due fiscal 2032 [Member]
Debt Instrument [Line Items]
Notes	400	400
Medium Term Notes due fiscal 2028, 6.57% - 7.28% [Member]
Debt Instrument [Line Items]
Medium Term Notes	8	8
Chinese Renminbi Debt, Due Fiscal 2024, 4.3% [Member]
Debt Instrument [Line Items]
Debt	$ 4	$ 4

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