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Derivative and Hedging Instruments - Additional Information (Detail) € in Billions	12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2023 EUR (€)	Sep. 30, 2022 EUR (€)
Derivative [Line Items]
Earnings related to forward points and interest differentials from forward contracts and swap agreements	$ (25,000,000)	$ 151,000,000	$ 156,000,000
Net unrealized gain (loss)	(126,000,000)	190,000,000	0
Expected amount of accumulated other comprehensive income (loss) expected to be reclassified	46,000,000
Pre-tax gains (losses) in other comprehensive income (loss) related to net investment hedges	(445,000,000)	845,000,000	$ 20,000,000
Accrued liabilities
Derivative [Line Items]
Collateral received with counterparties	91,000,000
Other Assets
Derivative [Line Items]
Posted collateral	47,000,000
Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	11,000,000,000	11,900,000,000
Designated as Hedging Instrument | Net Investment Hedging
Derivative [Line Items]
Hedged liability, fair value hedge | €				€ 3.0	€ 1.2
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 800,000,000	$ 1,500,000,000

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Nominal or face amount used to calculate payments on the derivative asset.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount of liability hedged in fair value hedging relationship.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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