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Employee Benefit Plans - Fair Value of Pension Plan Assets by Asset Category (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets $ 144 $ 135
Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 13 9
Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 78 120
Other Investment Funds    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets   1
Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 53 5
Fair Value, Inputs, Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 16 10
Fair Value, Inputs, Level 1 | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 12 8
Fair Value, Inputs, Level 1 | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 4 1
Significant Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 128 125
Significant Observable Inputs (Level 2) [Member] | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1 1
Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 74 119
Significant Observable Inputs (Level 2) [Member] | Other Investment Funds    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets   1
Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 53 5
Cash and Cash Equivalent Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets   1
Cash and Cash Equivalent Funds [Member] | Fair Value, Inputs, Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets   1
Non-U.S. Equities [Member] | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 6 4
Non-U.S. Equities [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 6 4
Equity Funds [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [1] 21 23
Equity Funds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [1] 21 23
Non-U.S. Government Bonds [Member] | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 2 1
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 1
Fixed Income Funds [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [2] 38 86
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] 38 86
Non-U.S. Corporate Bonds [Member] | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 3 2
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 2
Real Estate [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [3] 15 9
Real Estate [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [3] 15 9
Mortgage Backed Securities [Member] | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1 1
Mortgage Backed Securities [Member] | Significant Observable Inputs (Level 2) [Member] | Total Direct Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1 1
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
Cash Equivalent Funds [Member] | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 4 1
Cash Equivalent Funds [Member] | Fair Value, Inputs, Level 1 | Total Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 4 1
Insurance Contracts [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [4] 52 5
Insurance Contracts [Member] | Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets [4] 52 $ 5
Other Alternative Investments [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1  
Other Alternative Investments [Member] | Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets $ 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.