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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2026
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plans expenses $ 22 $ 20 $ 19  
Total pension plan assets 151 156    
U.K. Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation 43      
Total pension plan assets 51      
Defined benefit plan settlement charge recognized amount 3      
Pension Benefits [Member] | Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Expected contribution       $ 5
Postretirement Benefits [Member] | Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Expected contribution       $ 2
U.S. Defined Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation 2 2    
U.S. Defined Benefit Plans [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation 2 2 2  
U.S. Defined Benefit Plans [Member] | Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation 12 13 14  
Foreign Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation $ 142 145    
Foreign Plans [Member] | Equity [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of weighted-average target asset allocation 30.00%      
Foreign Plans [Member] | Fixed Income Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of weighted-average target asset allocation 47.00%      
Foreign Plans [Member] | Real Estate [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of weighted-average target asset allocation 18.00%      
Foreign Plans [Member] | Cash and Other Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of weighted-average target asset allocation 5.00%      
Foreign Plans [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation $ 152 155 139  
Total pension plan assets 151 156 144  
Foreign Plans [Member] | Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation $ 11 $ 12 $ 11