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Financial Instruments - Fair Value of Financial Instruments by Valuation Hierarchy (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 115 $ 101
Short-term debt 0 0
Long-term debt 0 0
Level 1 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 95 0
Long-term debt 945 937
Level 2 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets 1 1
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 19 19
Long-term debt 138 145
Level 3 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets $ 0 $ 0