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PENSION AND OTHER POSTRETIREMENT BENEFITS - Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | ---
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 9,216 | $ 10,469
Accumulated benefit obligation | 8,672 | 8,658
Projected benefit obligation | 9,340 | 10,522
Fair value of plan assets | 8,786 | 8,689
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 109 | 181
Fair value of plan assets | $ 30 | $ 85

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