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Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Derivatives, Fair Value [Line Items]
Companys hedged interest rate transactions			2 years
Deferred (losses) gains on derivative financial instruments	$ 14,000,000	$ 3,000,000	$ 21,000,000	$ 6,000,000
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	820,000,000		820,000,000		$ 820,000,000
Deferred gain (loss) on derivative financial instruments			4,000,000
Deferred (losses) gains on derivative financial instruments					$ (17,000,000)
Unrealized pre-tax (losses) gains on derivative financial instruments			28,000,000	8,000,000
Foreign Exchange Contract | Other Income (Expense)
Derivatives, Fair Value [Line Items]
Realized foreign exchange forward contract gain (loss)			3,000,000	(2,000,000)
Unrealized foreign exchange forward contract gain (loss)			2,000,000	$ 0
Sale
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	287,000,000		287,000,000
Purchase
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	$ 204,000,000		$ 204,000,000

X

- Definition

Nominal or face amount used to calculate payment on derivative.

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Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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