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Derivative Financial Instruments - Additional Information (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Derivatives, Fair Value [Line Items] |  |  |
Outstanding hedge contracts |  |  | $ 0
Foreign Exchange Contract | Other Income (Expense) |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Realized foreign exchange forward contract gain | $ 7,000,000 | $ 1,000,000 |
Unrealized foreign exchange forward contract gain (loss) | 3,000,000 | $ 0 |
Sale |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding hedge contracts | 369,000,000 |  |
Purchase |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding hedge contracts | $ 206,000,000 |  |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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