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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 28, 2021 | Mar. 29, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | $ 178,000,000 | $ 140,000,000
Recognition of previously deferred postretirement benefit plan amounts, net of tax | 140,000,000 | 110,000,000
Retiree medical and life insurance plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | 4,000,000 | 5,000,000
Qualified defined benefit pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Material contributions to qualified defined benefit pension plans | $ 0 | $ 0

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