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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Derivatives, Fair Value [Line Items] |  |  |  |  |
Deferred (losses) gains on derivative financial instruments | $ 0 | $ (3) | $ (1) | $ (8) |
Interest rate swap |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Outstanding hedge contracts |  |  |  |  | $ 500
Deferred (losses) gains on derivative financial instruments |  |  |  |  | $ 1
Unrealized pre-tax (losses) gains on derivative financial instruments |  |  | (1) | 11 |
Foreign Exchange Contract | Other Income (Expense) |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Realized foreign exchange forward contract loss |  |  | 1 | 6 |
Unrealized foreign exchange forward contract gain (loss) |  |  | 1 | $ (1) |
Sale |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Outstanding hedge contracts | 175 |  | 175 |  |
Purchase |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Outstanding hedge contracts | $ 108 |  | $ 108 |  |

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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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