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Share-Based Compensation - Fair Value of Stock Units Vested (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Performance-Based Restricted Stock Units |  |  |
Schedule Of Share Based Compensation, Restricted Stock Units, Fair Value of Stock Units Vested [Line Items] |  |  |
Total fair value of restricted stock units | $ 28 | $ 14 | $ 16
Time-Vested Restricted Stock Units |  |  |
Schedule Of Share Based Compensation, Restricted Stock Units, Fair Value of Stock Units Vested [Line Items] |  |  |
Total fair value of restricted stock units | $ 169 | $ 169 | $ 203

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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. + Details
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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 + Details
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