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Stock-based Compensation - Narrative (Details) shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2022 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 | 54
Restricted (Nonvested) Stock |
Stock Based Compensation Activity [Line Items] |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 107
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years
Performance Shares |
Stock Based Compensation Activity [Line Items] |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 37
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 8 months 12 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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