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Financial Instruments - Fair Value of Financial Instruments by Valuation Hierarchy (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 508 $ 108
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]    
Derivative assets 0  
Derivative liabilities 0  
Level 1 | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets   0
Derivative liabilities   0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 133 49
Long-term debt 709 782
Level 2 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 1  
Derivative liabilities 3  
Level 2 | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets   10
Derivative liabilities   5
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 11 11
Long-term debt 470 171
Level 3 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0  
Derivative liabilities $ 0  
Level 3 | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets   0
Derivative liabilities   $ 0