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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 24, 2018 | Jun. 30, 2019 | Jun. 24, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | $ 288,000,000 | $ 381,000,000 | $ 577,000,000 | $ 763,000,000
Recognition of previously deferred postretirement benefit plan amounts, net of tax | 227,000,000 | 300,000,000 | 454,000,000 | 600,000,000
Retiree medical and life insurance plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | 9,000,000 | 15,000,000 | 20,000,000 | 29,000,000
Qualified defined benefit pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Material contributions to qualified defined benefit pension plans | $ 0 | $ 2,000,000,000.0 | $ 0 | $ 3,500,000,000

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