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Stock-based Compensation - Narrative (Details) shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2023 USD ($) shares
Stock Based Compensation Activity [Line Items] |
Shares authorized for issuance under 2021 Plan (in shares) | shares | 55
Shares available for issuance under the 2021 Plan (in shares) | shares | 41
Restricted (Nonvested) Stock |
Stock Based Compensation Activity [Line Items] |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 113
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 10 months 24 days
Performance Shares |
Stock Based Compensation Activity [Line Items] |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 32
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 10 months 24 days
Employee Stock Option |
Stock Based Compensation Activity [Line Items] |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 10
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 7 months 6 days

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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