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Derivative Financial Instruments - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Derivatives, Fair Value [Line Items]
Company's hedged interest rate transactions	3 years
Derivative, notional amount	$ 0	$ 0
Deferred gains (losses) in comprehensive loss related to foreign exchange hedging	0	0
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, notional amount	820,000,000	820,000,000
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax	17,000,000	29,000,000
Pre-tax gains (losses) of the company derivative interest rate swaps	15,000,000	(27,000,000)
Foreign Exchange Forward
Derivatives, Fair Value [Line Items]
Derivative, gain (loss) on derivative, net	$ 3,000,000
Pre-tax gains (losses) of the company derivative interest rate swaps		$ (4,000,000)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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X

- Definition

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.

+ References

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- Definition

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

+ References

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-Publisher FASB
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- Definition

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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- Definition

Deferred gains losses in comprehensive loss related to foreign exchange hedging.

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