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Leases - Supplemental Cash Flow Information Related to Company's Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 18	$ 18	$ 17
Operating cash flows from finance leases	1	2	2
Financing cash flows from finance leases	4	3	4
Right-of-use assets obtained in exchange for new operating lease liabilities	9	11	14
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 2	$ 4	$ 1

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- Definition

Operating cash flows from finance leases payments.

+ References

No definition available.

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- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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-Section 45
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-Publisher FASB
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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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-Topic 842
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-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Topic 842
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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