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Debt and Other Obligations - Schedule of Long-Term Obligations (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]    
Total variable rate debt $ 148 $ 99
Total Medium Term Notes 23 23
Debt 1,075  
Total debt 927 927
Finance lease obligations (Note T) 31 12
Unamortized debt issuance costs and debt discount (5) (7)
Total debt 1,101 1,031
Less current portion of long-term debt (7) (7)
Total long-term debt 1,094 1,024
Revolving Credit Facility - Canada, expires fiscal 2021 [Member]    
Debt Instrument [Line Items]    
Line of credit   43
Revolving Credit Facility - Euro, expires fiscal 2024 [Member]    
Debt Instrument [Line Items]    
Line of credit 148 56
3.7% Notes due fiscal 2022 [Member]    
Debt Instrument [Line Items]    
Notes 350 350
3.4% Notes due fiscal 2026 [Member]    
Debt Instrument [Line Items]    
Notes 250 250
Notes due fiscal 2022, 8.34% - 8.47% [Member]    
Debt Instrument [Line Items]    
Total Medium Term Notes 15 15
Notes due fiscal 2028, 6.57% - 7.28% [Member]    
Debt Instrument [Line Items]    
Total Medium Term Notes 8 8
4.0% Notes due fiscal 2029 [Member]    
Debt Instrument [Line Items]    
Notes 300 300
Chinese Renminbi Debt, Due Fiscal 2020, 4.35% [Member]    
Debt Instrument [Line Items]    
Debt   $ 4
Chinese Renminbi Debt, due fiscal 2021, 4.35% [Member]    
Debt Instrument [Line Items]    
Debt $ 4