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Retirement Plans - Schedule of Retirement Plans Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Discontinued Operations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total retirement plans expense (income) | $ 7 | $ 16 | $ 21
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | 25 | 49 | 54
Interest cost | 164 | 99 | 94
Expected return on plan assets | (247) | (253) | (264)
Net amortization and other | (55) | 102 | 143
Net periodic pension expense (income) | (113) | (3) | 27
Defined contribution plans | 111 | 124 | 114
Total retirement plans expense (income) | (2) | 121 | 141
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | 20 | 25 | 29
Interest cost | 50 | 33 | 32
Expected return on plan assets | (39) | (56) | (74)
Net amortization and other | 18 | 3 | 14
Net periodic pension expense (income) | 49 | 5 | 1
Defined contribution plans | 49 | 52 | 52
Total retirement plans expense (income) | $ 98 | $ 57 | $ 53

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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