v3.26.1
Derivative Instruments and Hedging Activities - Schedule of Fair Values of Derivative Instruments and Other Amounts (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Foreign currency exchange derivatives    
Derivatives, Fair Value [Line Items]    
Other current assets $ 29 $ 36
Other noncurrent assets 1 1
Other current liabilities 11 7
Other noncurrent liabilities 1 3
Cross-currency interest rate swaps    
Derivatives, Fair Value [Line Items]    
Other current assets 3  
Other noncurrent assets 1  
Other current liabilities   1
Other noncurrent liabilities   3
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815    
Derivatives, Fair Value [Line Items]    
Total assets 34 33
Total liabilities 11 13
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives    
Derivatives, Fair Value [Line Items]    
Other current assets 29 32
Other noncurrent assets 1 1
Other current liabilities 10 7
Other noncurrent liabilities 1 2
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps    
Derivatives, Fair Value [Line Items]    
Other current assets 3 0
Other noncurrent assets 1 0
Other current liabilities 0 1
Other noncurrent liabilities 0 3
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815    
Derivatives, Fair Value [Line Items]    
Total assets 0 4
Total liabilities 1 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives    
Derivatives, Fair Value [Line Items]    
Other current assets 0 4
Other noncurrent assets 0 0
Other current liabilities 1 0
Other noncurrent liabilities 0 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps    
Derivatives, Fair Value [Line Items]    
Other current assets 0 0
Other noncurrent assets 0 0
Other current liabilities 0 0
Other noncurrent liabilities $ 0 $ 0