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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Changes in Fair Value Measurements that Used Significant Unobservable Inputs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning of period | $ 2,350 |
End of period | 2,228 | $ 2,350
Significant unobservable inputs (Level 3) |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning of period | 155 |
End of period | 127 | 155
Other holdings |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning of period | 239 |
End of period | 215 | 239
Other holdings | Significant unobservable inputs (Level 3) |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning of period | 155 | 7
Purchases | 3 | 148
Unrealized gains (losses) | (24) |
Sales | (7) |
End of period | 127 | $ 155
Other holdings | Significant unobservable inputs (Level 3) | United Kingdom |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Purchases | $ 148 |

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