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PENSION AND OTHER POSTRETIREMENT BENEFITS - Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions | Jan. 01, 2021 | Jan. 03, 2020
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Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 10,469 | $ 9,656
Accumulated benefit obligation | 8,658 | 7,931
Projected benefit obligation | 10,522 | 9,700
Fair value of plan assets | 8,689 | 7,959
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 181 | 322
Fair value of plan assets | $ 85 | $ 224

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