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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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