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Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value | $ 10 | $ 15
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value | 10 | 15
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value | 0 | 0
Other noncurrent liabilities: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contractual obligations | (1) | (1)
Other noncurrent liabilities: | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contractual obligations | 0 | 0
Other noncurrent liabilities: | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contractual obligations | 0 | 0
Other noncurrent liabilities: | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contractual obligations | (1) | $ (1)
Other Noncurrent Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other assets
Foreign Exchange Contract | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Exchange Contracts | 1 |
Foreign Exchange Contract | Other Current Assets | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Exchange Contracts | 0 |
Foreign Exchange Contract | Other Current Assets | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Exchange Contracts | 1 |
Foreign Exchange Contract | Other Current Assets | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Exchange Contracts | 0 |
Interest rate swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Exchange Contracts | $ 0 | $ 2
Equity investment with readily determinable fair value |  | 2
Interest rate swap | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value |  | 0
Interest rate swap | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value |  | 2
Interest rate swap | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment with readily determinable fair value |  | $ 0
Interest rate swap | Other Current Assets | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Prepaid and other current assets | Prepaid and other current assets

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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