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PENSION AND OTHER POSTRETIREMENT BENEFITS - Balance Sheet Impact (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in plan assets |  |  |
Postretirement benefit obligations other than pensions | $ (134) | $ (146) |
Pension ongoing income—non-service | U.S. Plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 13,290 | 17,391 |
Service cost | 29 | 86 | $ 105
Interest cost | 645 | 380 | 306
Plan amendments | 0 | 0 |
Actuarial (gains) losses | 337 | (3,135) |
Benefits paid | (1,509) | (1,421) |
Settlements and curtailments | 0 | (13) |
Foreign currency translation | 0 | 0 |
Other | 0 | 2 |
Benefit obligation at end of year | 12,792 | 13,290 | 17,391
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 17,005 | 20,560 |
Actual return on plan assets | 1,070 | (2,161) |
Company contributions | 28 | 37 |
Benefits paid | (1,509) | (1,421) |
Settlements and curtailments | 0 | (13) |
Foreign currency translation | 0 | 0 |
Other | 0 | 3 |
Fair value of plan assets at end of year | 16,594 | 17,005 | 20,560
Funded status of plans | 3,802 | 3,715 |
Prepaid pension benefit cost | 4,052 | 3,970 |
Accrued pension liabilities - current | (26) | (28) |
Accrued pension liabilities - noncurrent | (224) | (227) |
Net amount recognized | 3,802 | 3,715 |
Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 4,400 | 6,999 |
Service cost | 11 | 19 | 26
Interest cost | 200 | 103 | 77
Plan amendments | 0 | 0 |
Actuarial (gains) losses | 191 | (1,929) |
Benefits paid | (250) | (261) |
Settlements and curtailments | 0 | 0 |
Foreign currency translation | 165 | (533) |
Other | 1 | 2 |
Benefit obligation at end of year | 4,718 | 4,400 | 6,999
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 5,304 | 8,396 |
Actual return on plan assets | 267 | (2,187) |
Company contributions | 22 | 17 |
Benefits paid | (250) | (261) |
Settlements and curtailments | 0 | 0 |
Foreign currency translation | 205 | (664) |
Other | 1 | 3 |
Fair value of plan assets at end of year | 5,549 | 5,304 | 8,396
Funded status of plans | 831 | 904 |
Prepaid pension benefit cost | 1,335 | 1,356 |
Accrued pension liabilities - current | (15) | (14) |
Accrued pension liabilities - noncurrent | (489) | (438) |
Net amount recognized | 831 | 904 |
Other Postretirement Benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 133 | 196 |
Service cost | 0 | 0 | 0
Interest cost | 6 | 5 | 5
Plan amendments | 0 | 0 |
Actuarial (gains) losses | 3 | (54) |
Benefits paid | (26) | (14) |
Benefit obligation at end of year | 116 | 133 | 196
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Company contributions | 0 | 0 |
Benefits paid | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Funded status of plans | (116) | (133) |
Accrued pension liabilities - current | (12) | (21) |
Postretirement benefit obligations other than pensions | (104) | (112) |
Net amount recognized | (116) | (133) |
Foreign plans excluded from postretirement benefits other than pensions | $ 30 | $ 34 |

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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to plan assets. + References No definition available. + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References No definition available. + Details
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