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Leases - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Lessee, Lease, Description [Line Items] |  |  |
Renewal term (in years) | 10 years |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
ROU assets | $ 873 | $ 488 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Unsettled repurchases | Unsettled repurchases |
Current portion of lease liabilities | $ 150 | $ 106 |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities |
Noncurrent portion of lease liabilities | $ 685 | $ 412 |
Operating lease cost | $ 179 | $ 129 | $ 117
Weighted average remaining lease term (in years) | 8 years | 8 years |
Weighted average discount rate | 3.51% | 2.43% |
Right-of-use asset obtained in exchange for operating lease liability | $ 410 | $ 82 | $ 74

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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