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RETIREMENT BENEFITS PLANS - Benefits Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Pension plans | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Service cost | $ 16 | $ 18 | $ 19
Interest cost | 135 | 134 | 142
Expected return on plan assets | (190) | (190) | (195)
Amortization | 15 | 9 | 4
Total | (24) | (29) | (30)
Settlements, curtailments, and special termination benefits | 40 | 41 | 34
Total expense (income) | 16 | 12 | 4
Pension plans | Non-United States plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Service cost | 45 | 46 | 43
Interest cost | 88 | 85 | 85
Expected return on plan assets | (128) | (134) | (121)
Amortization | 16 | 11 | 7
Total | 21 | 8 | 14
Settlements, curtailments, and special termination benefits | 9 | 7 | 4
Total expense (income) | 30 | 15 | 18
Other postretirement benefits expense (income) |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Service cost | 0 | 1 | 1
Interest cost | 11 | 10 | 10
Expected return on plan assets | (1) | (1) | (1)
Amortization | (13) | (13) | (17)
Total | (3) | (3) | (7)
Settlements, curtailments, and special termination benefits | 0 | 0 | 0
Total expense (income) | $ (3) | $ (3) | $ (7)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit 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)(4) -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)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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