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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension |  |  |
Change in benefit obligation: |  |  |
Benefit obligation as of January 1 | $ 8,828 | $ 11,479 |
Service cost | 139 | 184 | $ 195
Interest cost | 428 | 273 | 226
Plan participants’ contributions | 0 | 0 |
Special termination benefits | 21 | 0 |
Medicare retiree drug subsidy | 0 | 0 |
Lift-out transaction | (719) | 0 |
Actuarial loss (gain) | 256 | (2,515) |
Benefits paid | (590) | (593) |
Benefit obligation as of December 31 | 8,363 | 8,828 | 11,479
Change in fair value of plan assets: |  |  |
Fair value of plan assets as of January 1 | 6,693 | 9,020 |
Actual return on plan assets | 682 | (1,760) |
Lift-out transaction | (683) | 0 |
Company contributions | 777 | 26 |
Plan participants’ contributions | 0 | 0 |
Benefits paid | (590) | (593) |
Fair value of plan assets as of December 31 | 6,879 | 6,693 | 9,020
Funded Status: |  |  |
Funded Status (Net liability as of December 31) | (1,484) | (2,135) |
Accumulated benefit obligation | 7,324 | 8,500 |
Amounts Recognized in AOCI: |  |  |
Prior service cost (credit) | 4 | 6 |
Pension | Qualified plan |  |  |
Funded Status: |  |  |
Funded Status (Net liability as of December 31) | (1,090) | (1,734) |
Pension | Non-qualified plans |  |  |
Funded Status: |  |  |
Funded Status (Net liability as of December 31) | (394) | (401) |
OPEB |  |  |
Change in benefit obligation: |  |  |
Benefit obligation as of January 1 | 439 | 549 |
Service cost | 2 | 3 | 4
Interest cost | 21 | 11 | 11
Plan participants’ contributions | 4 | 3 |
Special termination benefits | 8 | 0 |
Medicare retiree drug subsidy | 0 | 1 |
Lift-out transaction | 0 | 0 |
Actuarial loss (gain) | 8 | (83) |
Benefits paid | (41) | (45) |
Benefit obligation as of December 31 | 441 | 439 | 549
Change in fair value of plan assets: |  |  |
Fair value of plan assets as of January 1 | 460 | 548 |
Actual return on plan assets | 69 | (70) |
Lift-out transaction | 0 | 0 |
Company contributions | 24 | 24 |
Plan participants’ contributions | 4 | 3 |
Benefits paid | (41) | (45) |
Fair value of plan assets as of December 31 | 516 | 460 | $ 548
Funded Status: |  |  |
Funded Status (Net liability as of December 31) | 75 | 21 |
Accumulated benefit obligation | 0 | 0 |
Amounts Recognized in AOCI: |  |  |
Prior service cost (credit) | (1) | (10) |
OPEB | Qualified plan |  |  |
Funded Status: |  |  |
Funded Status (Net liability as of December 31) | 0 | 0 |
OPEB | Non-qualified plans |  |  |
Funded Status: |  |  |
Funded Status (Net liability as of December 31) | $ 0 | $ 0 |

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