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Retirement Plans - Narrative (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2023 USD ($) person | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Retirement Plans [Line Items] |  |  |
Total employer contributions to defined benefit plans | $ 55 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | 24 |  |
Voluntary contributions made by the company to defined benefit plans | 0 |  |
Matching contributions charged to expense for defined contribution savings plans | $ 209 | $ 196 | $ 118
Number of multiemployer benefit plans in which the Company participates | person | 260 |  |
Multiemployer plan, employer contribution, cost | $ 67 | $ 71 | $ 67
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Total employer contributions to defined benefit plans | 2 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | $ 2 |  |

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- Definition Voluntary contributions made by the company to defined benefit plans. + References No definition available. + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480547/715-80-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480606/715-80-35-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480576/715-80-50-11 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480576/715-80-50-9 + Details
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