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Share-Based Compensation - Fair Value of Stock Units Vested (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Performance-Based
Schedule Of Share Based Compensation, Restricted Stock Units, Fair Value of Stock Units Vested [Line Items]
Total fair value of units vested	$ 45	$ 45	$ 28
Time-Vested
Schedule Of Share Based Compensation, Restricted Stock Units, Fair Value of Stock Units Vested [Line Items]
Total fair value of units vested	$ 189	$ 179	$ 169

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- Definition

[Line Items] for Schedule Of Share Based Compensation, Restricted Stock Units, Fair Value of Stock Units Vested [Table]

+ References

No definition available.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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