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Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss), Pre-Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense) Other income (expense)
Pension Benefits [Member] | Foreign Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses $ 9 $ 1 $ (2)
Prior service (credit) cost $ (1)    
Amortization of prior unrecognized gains (losses)   $ 1 (1)
Loss on divestiture     $ (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense) Other income (expense)
Net changes recognized in Total other comprehensive (income) loss $ 8 $ 2 $ (5)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses   (1) (4)
Amortization of prior unrecognized gains (losses) $ 2 $ 1  
(Loss) gain on settlements     $ 1
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense) Other income (expense)
Net changes recognized in Total other comprehensive (income) loss $ 2   $ (3)
Postretirement Benefits [Member] | Foreign Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses $ 2 $ (3) $ (4)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense) Other income (expense) Other income (expense)
Net changes recognized in Total other comprehensive (income) loss $ 2 $ (3) $ (4)