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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 24, 2018 | Jun. 25, 2017 | Jun. 24, 2018 | Jun. 25, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | $ 381 | $ 309 | $ 763 | $ 621
Recognition of previously deferred postretirement benefit plan amounts, net of tax | 300 | 200 | 600 | 402
Retiree medical and life insurance plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax | 15 | 13 | 29 | 27
Qualified defined benefit pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Material contributions to qualified defined benefit pension plans | 2,000 | $ 0 | 3,500 | $ 0
Expected future employer contributions | $ 1,500 |  | $ 1,500 |

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