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PENSIONS AND POSTRETIREMENT BENEFITS - Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pension Benefits |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | $ 4,282 | $ 4,338
Actual return on plan assets: |  |
Fair value of plan assets — end of year | 4,237 | 4,282
Pension Benefits | Private equity |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 146 |
Actual return on plan assets: |  |
Fair value of plan assets — end of year | 151 | 146
OPEB |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 739 | 728
Actual return on plan assets: |  |
Fair value of plan assets — end of year | 742 | 739
Significant Unobservable Inputs (Level 3) | Pension Benefits |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 770 | 912
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 18 | (16)
Relating to assets sold during the period | 7 | 10
Purchases | 31 | 24
Sales | (134) | (160)
Fair value of plan assets — end of year | 692 | 770
Significant Unobservable Inputs (Level 3) | Pension Benefits | Private equity |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 146 |
Actual return on plan assets: |  |
Fair value of plan assets — end of year | 151 | 146
Significant Unobservable Inputs (Level 3) | OPEB |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 27 |
Actual return on plan assets: |  |
Fair value of plan assets — end of year | 19 | 27
Significant Unobservable Inputs (Level 3) | OPEB | VEBA Assets |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 27 | 35
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 1 | 2
Relating to assets sold during the period | 0 | 1
Purchases | 0 | 0
Sales | (9) | (11)
Fair value of plan assets — end of year | $ 19 | $ 27

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