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Employee Benefit Plans - Fair Value of Pension Plan Assets by Asset Category (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 151 $ 156  
Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 14 14  
Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   86 $ 84
Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 49 55  
Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 18 14  
Fair Value, Inputs, Level 1 | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 14 13  
Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 133 142  
Significant Observable Inputs (Level 2) [Member] | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0 1  
Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   86 $ 84
Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 49 55  
Cash and Cash Equivalent Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 4 1  
Cash and Cash Equivalent Funds [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 4 1  
Non-U.S. Equities [Member] | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 8 7  
Non-U.S. Equities [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 8 7  
Equity Funds [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [1] 22 16  
Equity Funds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [1] 22 16  
Non-U.S. Government Bonds [Member] | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2 2  
Non-U.S. Government Bonds [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2 2  
Non-U.S. Government Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0 1  
Fixed Income Funds [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [2] 44 46  
Fixed Income Funds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [2] 44 46  
Non-U.S. Corporate Bonds [Member] | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 3 4  
Non-U.S. Corporate Bonds [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 3 3  
Real Estate [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [3] 11    
Real Estate [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [3] 11 18  
Other Investment Funds [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 7 6  
Other Investment Funds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 7 6  
Other Fixed Income [Member] | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1 1  
Other Fixed Income [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1 1  
Insurance Contracts [Member] | Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [4] 47 54  
Insurance Contracts [Member] | Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets [4] 47 54  
Other Alternative Investments [Member] | Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2 1  
Other Alternative Investments [Member] | Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 2 $ 1  
[1] The equity funds asset class includes funds that invest in U.S. equities as well as equity securities issued by companies incorporated, listed or domiciled in countries in developed and/or emerging markets. These companies may be in the small-, mid- or large-cap categories.
[2] The fixed income funds asset class includes investments in high quality funds. High quality fixed income funds primarily invest in low-risk U.S. and non-U.S. government securities, investment-grade corporate bonds, mortgages and asset-backed securities. A significant portion of the fixed income funds include investment in long-term bond funds.
[3] The real estate funds asset class includes funds that primarily invest in entities which are principally engaged in the ownership, acquisition, development, financing, sale and/or management of income-producing real estate properties, both commercial and residential. These funds typically seek long-term growth of capital and current income that is above average relative to public equity funds.
[4] Insurance contracts held by the Company’s non-U.S. plans are issued by well-known, highly rated insurance companies.