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PENSION AND POSTRETIREMENT PLANS - Schedule of Retirement Plans Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | $ 17 | $ 25 | $ 49
Interest cost | 169 | 164 | 99
Expected return on plan assets | (259) | (247) | (253)
Net amortization and other | (43) | (55) | 102
Net periodic pension expense (income) | (116) | (113) | (3)
Defined contribution plans | 130 | 111 | 124
Total retirement plans expense (income) | 14 | (2) | 121
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | 20 | 20 | 25
Interest cost | 49 | 50 | 33
Expected return on plan assets | (38) | (39) | (56)
Net amortization and other | 6 | 18 | 3
Net periodic pension expense (income) | 37 | 49 | 5
Defined contribution plans | 70 | 49 | 52
Total retirement plans expense (income) | $ 107 | $ 98 | $ 57

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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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