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Derivative and Non-derivative Financial Instruments - Additional Information (Detail) € in Billions	12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2022 EUR (€)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 EUR (€)	Jun. 30, 2022 USD ($)
Derivative [Line Items]
Net unrealized gain (loss)	$ 190,000,000	$ 0	$ 0
Expected amount of accumulated other comprehensive income (loss) expected to be reclassified	140,000,000
Pre-tax gains (losses) in other comprehensive income (loss) related to net investment hedges	845,000,000	20,000,000	(318,000,000)
Earnings related to forward points and interest differentials from forward contracts and swap agreements	$ 151,000,000	156,000,000	$ 150,000,000
June 2022 Notes \| Europe \| Senior Notes
Derivative [Line Items]
Aggregate principal				€ 3.0		€ 3.0	$ 3,200,000,000
Accrued liabilities
Derivative [Line Items]
Collateral received with counterparties					$ 348,000,000
Other Assets
Derivative [Line Items]
Posted collateral					62,000,000
Designated as Hedging Instrument
Derivative [Line Items]
Notional amount		11,200,000,000			11,900,000,000
Designated as Hedging Instrument \| June 2022 Notes \| Net Investment Hedging
Derivative [Line Items]
Hedged liability, fair value hedge \| €				€ 1.2
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount		$ 800,000,000			$ 1,500,000,000