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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses     $ (2)
(Loss) gain on settlements     (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)  
Net changes recognized in Total other comprehensive (income) loss     (6)
Pension Benefits [Member] | Foreign Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses $ 1 $ (2) (15)
Prior service (credit) cost     (1)
Amortization of prior unrecognized loss $ 1 (1) (3)
Loss on divestiture   $ (2)  
(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)  
Net changes recognized in Total other comprehensive (income) loss $ 2 $ (5) $ (20)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses (1) (4)  
Amortization of prior unrecognized loss 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)
Net changes recognized in Total other comprehensive (income) loss   (3)  
Postretirement Benefits [Member] | Foreign Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses (3) (4) $ (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income (expense)
Net changes recognized in Total other comprehensive (income) loss $ (3) $ (4) $ (2)