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Stock-based Compensation - Narrative (Details) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024 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	36
Restricted (Nonvested) Stock
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 120
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Performance Shares
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 27
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Employee Stock Option
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 9
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 7 months 6 days

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Stock Based Compensation Activity [Line Items]

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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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.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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