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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Employee benefit plan obligation	$ 83	$ 83
Aggregate pension liability recorded in balance sheet	58	57
Pension expense	4	4	$ 4
Employers contribution plan expense	$ 9	$ 8	$ 6

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- References

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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-Publisher FASB
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Amount of cost for defined contribution plan.

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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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