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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes in benefit obligations and the fair value of plan assets for our pension and other postretirement benefit plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension plans |  |  |
Changes in benefit obligations |  |  |
Benefit obligation at January 1 | $ 6,376 | $ 8,580 |
Service cost | 94 | 93 | $ 97
Interest cost | 322 | 232 | 183
Participant Contributions | 5 | 5 |
Foreign currency exchange rate changes | 27 | (152) |
Amendments | 0 | 9 |
Net actuarial loss (gain) | 375 | (1,891) |
Benefits Paid | (369) | (500) |
Divestitures | 0 | (2) |
Settlements | (287) | (26) |
Curtailments | 0 | (1) |
Special termination benefits | 1 | 1 | 3
Other | 0 | 28 |
Benefit obligation at December 31 | 6,544 | 6,376 | 8,580
Accumulated Benefit Obligation | 6,463 | 6,307 |
Fair value of plan assets |  |  |
Fair value of plan assets at January 1 | 7,158 | 8,905 |
Actual return on plan assets | 537 | (1,101) |
Employer contributions | 44 | 33 |
Participant Contributions | 5 | 5 |
Foreign currency exchange rate changes | 76 | (258) |
Benefits Paid | (300) | (427) |
Settlements | (260) | (26) |
Other | 0 | 27 |
Fair value of plan assets at December 31 | 7,260 | 7,158 | 8,905
Net liability recognized | 716 | 782 |
Settlement charges (credits) | 81 | (1) | 117
Pension plans | Defined Benefit Plan, Funded Plan |  |  |
Fair value of plan assets |  |  |
Settlements | (259) |  |
Settlement charges (credits) | 76 |  |
Pension plans | Change in Assumptions for Defined Benefit Plans |  |  |
Changes in benefit obligations |  |  |
Net actuarial loss (gain) | 129 | (1,231) |
Other postretirement benefit plans |  |  |
Changes in benefit obligations |  |  |
Benefit obligation at January 1 | 495 | 696 |
Service cost | 4 | 7 | 9
Interest cost | 27 | 17 | 15
Participant Contributions | 9 | 11 |
Foreign currency exchange rate changes | (4) | (4) |
Amendments | 1 | 0 |
Net actuarial loss (gain) | 14 | (175) |
Benefits Paid | (62) | (57) |
Divestitures | 0 | 0 |
Settlements | (187) | 0 |
Curtailments | 0 | 0 |
Special termination benefits | 0 | 0 | 0
Other | 0 | 0 |
Benefit obligation at December 31 | 297 | 495 | 696
Fair value of plan assets |  |  |
Fair value of plan assets at January 1 | 373 | 419 |
Actual return on plan assets | 17 | (55) |
Employer contributions | 0 | 0 |
Participant Contributions | 7 | 9 |
Foreign currency exchange rate changes | 0 | 0 |
Benefits Paid | (34) | 0 |
Settlements | (187) | 0 |
Other | 0 | 0 |
Fair value of plan assets at December 31 | 176 | 373 | 419
Net liability recognized | (121) | (122) |
Settlement charges (credits) | $ (14) | $ 0 | $ 0

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -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 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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