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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | $ 140,000,000 | $ 290,000,000 | $ 420,000,000 | $ 867,000,000
Recognition of previously deferred postretirement benefit plan amounts, net of tax | 110,000,000 | 227,000,000 | 330,000,000 | 681,000,000
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 | 11,000,000 | 14,000,000 | 31,000,000
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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