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Employee Benefit Plans - Change in Projected Benefit Obligations and Change in Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Change in Plan Assets:      
Fair value of plan assets at beginning of year $ 144    
Fair value of plan assets at end of year 156 $ 144  
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]      
Change in Benefit Obligations:      
Benefit obligation at beginning of year $ 2 $ 2  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense)  
Benefit obligation at end of year $ 2 $ 2 $ 2
Change in Plan Assets:      
Funded status (2) (2)  
Recognized asset (liability) (2) (2)  
Pension Benefits [Member] | Foreign Plans [Member]      
Change in Benefit Obligations:      
Benefit obligation at beginning of year 139 133  
Service cost 3 3 4
Interest cost $ 8 $ 7 4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense)  
Plan participants’ contribution $ 1 $ 1  
Foreign currency exchange rate changes 5 6  
(Gain) loss from changes in actuarial assumptions and plan experience 12 (4)  
Benefits paid (8) (5)  
Settlements or curtailments $ (5) $ (2)  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense)  
Benefit obligation at end of year $ 155 $ 139 133
Change in Plan Assets:      
Fair value of plan assets at beginning of year 144 135  
Actual return on plan assets 13 4  
Employer contribution 4 4  
Plan participants’ contribution 1 1  
Foreign currency exchange rate changes 7 7  
Benefits paid (8) (5)  
Settlements or curtailments (5) (2)  
Fair value of plan assets at end of year 156 144 135
Funded status 1 5  
Recognized asset (liability) 1 5  
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]      
Change in Benefit Obligations:      
Benefit obligation at beginning of year 14 16  
Interest cost 1 1  
(Gain) loss from changes in actuarial assumptions and plan experience 1 (1)  
Benefits paid $ (2) $ (2)  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense)  
Benefit obligation at end of year $ 13 $ 14 16
Change in Plan Assets:      
Employer contribution 2 2  
Benefits paid (2) (2)  
Funded status (13) (14)  
Recognized asset (liability) (13) (14)  
Postretirement Benefits [Member] | Foreign Plans [Member]      
Change in Benefit Obligations:      
Benefit obligation at beginning of year 11 13  
Interest cost $ 1 $ 1 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense)  
Foreign currency exchange rate changes   $ 1  
(Gain) loss from changes in actuarial assumptions and plan experience $ 2 (3)  
Benefits paid (1) (1)  
Settlements or curtailments (1)    
Benefit obligation at end of year 12 11 $ 13
Change in Plan Assets:      
Employer contribution 2 1  
Benefits paid (1) (1)  
Settlements or curtailments (1)    
Funded status (12) (11)  
Recognized asset (liability) $ (12) $ (11)