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Leases - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Lessee, Lease, Description [Line Items] |  |  |
Renewal term (in years) | 5 years |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
ROU assets | $ 488 | $ 480 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Accrued liabilities | Accrued liabilities |
Current portion of lease liabilities | $ 106 | $ 98 |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities |
Noncurrent portion of lease liabilities | $ 412 | $ 422 |
Operating lease cost | $ 129 | $ 117 | $ 111
Weighted average remaining lease term (in years) | 6 years | 6 years |
Weighted average discount rate | 2.43% | 2.15% |
Right-of-use asset obtained in exchange for operating lease liability | $ 82 | $ 74 | $ 96
Operating leases, not yet commenced, lease obligations | $ 433 |  |
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, non-cancellable lease terms | 1 year |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, non-cancellable lease terms | 14 years |  |

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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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