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Retirement Plans - Narrative (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2022 USD ($) person | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Retirement Plans [Line Items] |  |  |
Total employer contributions to defined benefit plans | $ 93 |  |
Voluntary contributions made by the company to defined benefit plans | 0 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | 38 |  |
Matching contributions charged to expense for defined contribution savings plans | $ 196 | $ 118 | $ 104
Number of multiemployer benefit plans in which the Company participates | person | 270 |  |
Multiemployer plan, employer contribution, cost | $ 71 | $ 67 | $ 66
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Total employer contributions to defined benefit plans | 3 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | $ 3 |  |

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- Definition Retirement Plans [Line Items] + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 35 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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