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PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension |  |  |
Change in benefit obligation: |  |  |
Benefit obligation as of January 1 | $ 8,363 | $ 8,828 |
Service cost | 140 | 139 | $ 184
Interest cost | 398 | 428 | 273
Plan participants’ contributions | 0 | 0 |
Special termination benefits | 0 | 21 |
Medicare retiree drug subsidy | 0 | 0 |
Lift-out transaction | 0 | (719) |
Actuarial loss (gain) | (526) | 256 |
Benefits paid | (551) | (590) |
Benefit obligation as of December 31 | 7,824 | 8,363 | 8,828
Change in fair value of plan assets: |  |  |
Fair value of plan assets as of January 1 | 6,879 | 6,693 |
Actual return on plan assets | (62) | 682 |
Lift-out transaction | 0 | (683) |
Company contributions | 30 | 777 |
Plan participants’ contributions | 0 | 0 |
Benefits paid | (551) | (590) |
Fair value of plan assets as of December 31 | 6,296 | 6,879 | 6,693
Funded Status: |  |  |
Funded Status - Net asset (liability) as of December 31 | (1,528) | (1,484) |
Accumulated benefit obligation | 7,572 | 7,324 |
Amounts Recognized in AOCI: |  |  |
Prior service cost (credit) | 2 | 4 |
Pension | Qualified plan |  |  |
Funded Status: |  |  |
Funded Status - Net asset (liability) as of December 31 | (1,165) | (1,090) |
Pension | Non-qualified plans |  |  |
Funded Status: |  |  |
Funded Status - Net asset (liability) as of December 31 | (363) | (394) |
OPEB |  |  |
Change in benefit obligation: |  |  |
Benefit obligation as of January 1 | 441 | 439 |
Service cost | 3 | 2 | 3
Interest cost | 20 | 21 | 11
Plan participants’ contributions | 4 | 4 |
Special termination benefits | 0 | 8 |
Medicare retiree drug subsidy | 1 | 0 |
Lift-out transaction | 0 | 0 |
Actuarial loss (gain) | (14) | 8 |
Benefits paid | (48) | (41) |
Benefit obligation as of December 31 | 407 | 441 | 439
Change in fair value of plan assets: |  |  |
Fair value of plan assets as of January 1 | 516 | 460 |
Actual return on plan assets | 65 | 69 |
Lift-out transaction | 0 | 0 |
Company contributions | 30 | 24 |
Plan participants’ contributions | 4 | 4 |
Benefits paid | (48) | (41) |
Fair value of plan assets as of December 31 | 567 | 516 | $ 460
Funded Status: |  |  |
Funded Status - Net asset (liability) as of December 31 | 160 | 75 |
Accumulated benefit obligation | 0 | 0 |
Amounts Recognized in AOCI: |  |  |
Prior service cost (credit) | 1 | (1) |
OPEB | Qualified plan |  |  |
Funded Status: |  |  |
Funded Status - Net asset (liability) as of December 31 | 0 | 0 |
OPEB | Non-qualified plans |  |  |
Funded Status: |  |  |
Funded Status - Net asset (liability) as of December 31 | $ 0 | $ 0 |

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