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