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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt | Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 3,065	$ 1,056
Foreign currency-denominated debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	4,521	3,146
Foreign currency-denominated debt | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	543	0
Currency Swap | Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,366	2,119
Fixed To Floating | Fair value hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	700	700
Interest Rate Swap [Member] | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 0	$ 500

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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.

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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

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