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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension plans |  |  |
Changes in benefit obligations |  |  |
Benefit obligation at January 1 | $ 6,544 | $ 6,376 |
Service cost | 105 | 94 | $ 93
Interest cost | 306 | 322 | 232
Participant Contributions | 6 | 5 |
Foreign currency exchange rate changes | (124) | 27 |
Amendments | (2) | 0 |
Net actuarial loss (gain) | (213) | 375 |
Benefits Paid | (478) | (369) |
Divestitures | (78) | 0 |
Settlements | (22) | (287) |
Curtailments | (1) | 0 |
Special termination benefits | 1 | 1 |
Other | 1 | 0 |
Benefit obligation at December 31 | 6,045 | 6,544 | 6,376
Accumulated Benefit Obligation | 6,008 | 6,463 |
Fair value of plan assets |  |  |
Fair value of plan assets at January 1 | 7,260 | 7,158 |
Actual return on plan assets | 345 | 537 |
Employer contributions | 31 | 44 |
Participant Contributions | 6 | 5 |
Foreign currency exchange rate changes | (203) | 76 |
Transfers | (523) | 0 |
Benefits Paid | (410) | (300) |
Divestitures | (62) | 0 |
Settlements | (9) | (260) |
Fair value of plan assets at December 31 | 6,435 | 7,260 | 7,158
Net liability recognized | 390 | 716 |
Settlement charges (credits) | (2) | 81 | (1)
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) | (178) | 129 |
Other postretirement benefit plans |  |  |
Changes in benefit obligations |  |  |
Benefit obligation at January 1 | 297 | 495 |
Service cost | 3 | 4 | 7
Interest cost | 17 | 27 | 17
Participant Contributions | 18 | 9 |
Foreign currency exchange rate changes | (3) | (4) |
Amendments | 0 | 1 |
Net actuarial loss (gain) | 11 | 14 |
Benefits Paid | (65) | (62) |
Divestitures | (1) | 0 |
Settlements | (92) | (187) |
Curtailments | 0 | 0 |
Special termination benefits | 0 | 0 |
Other | 0 | 0 |
Benefit obligation at December 31 | 185 | 297 | 495
Fair value of plan assets |  |  |
Fair value of plan assets at January 1 | 176 | 373 |
Actual return on plan assets | 6 | 17 |
Employer contributions | 0 | 0 |
Participant Contributions | 12 | 7 |
Foreign currency exchange rate changes | 0 | 0 |
Transfers | 0 | 0 |
Benefits Paid | (33) | (34) |
Divestitures | 0 | 0 |
Settlements | (92) | (187) |
Fair value of plan assets at December 31 | 69 | 176 | 373
Net liability recognized | (116) | (121) |
Settlement charges (credits) | (19) | $ (14) | $ 0
Other postretirement benefit plans | Defined Benefit Plan, Funded Plan |  |  |
Fair value of plan assets |  |  |
Settlements | (92) |  |
Settlement charges (credits) | $ (19) |  |

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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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