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Leases - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 6 years 8 months 12 days |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.20% |  |
Operating Lease, Cost | $ 145 | $ 138 | $ 132
Gross Proceeds from Sale Leaseback Transaction |  |  | 225
Other Operating Income (Expense) |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Sale and Leaseback Transaction, Gain (Loss), Net |  |  | $ 158
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 1 year |  |
Lessee, Operating Lease, Renewal Term |  |  | 6 months
Minimum | Sale Leaseback Transaction, Term of Contract |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract |  |  | 2 years
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 25 years |  |
Lessee, Operating Lease, Renewal Term |  |  | 12 months
Maximum | Sale Leaseback Transaction, Term of Contract |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract |  |  | 3 years

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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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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