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PENSION AND OTHER POSTRETIREMENT BENEFITS - Changes in Level 3 Fair Value (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Direct private investments | U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | $ 1,293 | $ 1,284
Relating to assets still held at year-end | 16 | (34)
Relating to assets sold during the year | 61 | 159
Purchases | 101 | 131
Sales and settlements | (134) | (247)
Fair value of plan assets at end of year | 1,337 | 1,293
Real estate properties | U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 977 | 1,005
Relating to assets still held at year-end | (14) | (115)
Relating to assets sold during the year | 0 | 0
Purchases | 10 | 88
Sales and settlements | (1) | (1)
Fair value of plan assets at end of year | 972 | 977
Private funds | Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 74 | 36
Relating to assets still held at year-end | 7 | 3
Relating to assets sold during the year | (7) | 1
Purchases | 19 | 39
Sales and settlements | (15) | (5)
Fair value of plan assets at end of year | 78 | 74
Real estate funds | Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 16 | 130
Relating to assets still held at year-end | 0 | 0
Relating to assets sold during the year | 0 | (3)
Purchases | 0 | 0
Sales and settlements | (14) | (111)
Fair value of plan assets at end of year | 2 | 16
Insurance buy-in contracts | Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,605 | 950
Relating to assets still held at year-end | (215) | 68
Relating to assets sold during the year | 0 | 0
Purchases | 0 | 587
Sales and settlements | 0 | 0
Fair value of plan assets at end of year | $ 1,390 | $ 1,605

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