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Derivative Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Derivatives, Fair Value [Line Items] |  |  |
Derivative, notional amount | $ 0 | $ 0 |
Deferred gains (losses) in comprehensive loss related to foreign exchange hedging | 0 | 0 |
Other comprehensive gain (loss), cash flow hedge, loss, after reclassification and tax | (1,000,000) | (12,000,000) | $ 30,000,000
Interest Rate Swap |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, notional amount | 0 | 500,000,000 |
Other comprehensive gain (loss), cash flow hedge, loss, after reclassification and tax | 0 | 1,000,000 |
Pre-tax gains (losses) of the company derivative interest rate swaps | (1,000,000) | (16,000,000) |
Foreign Exchange Forward |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Losses on derivative, net | $ 1,000,000 | $ 6,000,000 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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