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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2021 | Jun. 28, 2020 | Jun. 27, 2021 | Jun. 28, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | $ 177,000,000 | $ 140,000,000 | $ 355,000,000 | $ 280,000,000
Recognition of previously deferred postretirement benefit plan amounts, net of tax | 140,000,000 | 110,000,000 | 280,000,000 | 220,000,000
Retiree medical and life insurance plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | 3,000,000 | 5,000,000 | 7,000,000 | 10,000,000
Qualified defined benefit pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Material contributions to qualified defined benefit pension plans | $ 0 | $ 0 | $ 0 | $ 0

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