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Accumulated Other Comprehensive Income (Loss) ("AOCI") - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Equity [Abstract] |  |
Gain associated with the net investment hedges out of AOCI | $ 1 | $ 1

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- References No definition available. + Details
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- Definition Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CCC -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CCC + Details
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