POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 24, 2018	Jun. 30, 2019	Jun. 24, 2018
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 129	$ 158	$ 258	$ 315
Interest cost	451	435	903	870
Expected return on plan assets	(575)	(598)	(1,150)	(1,197)
Recognized net actuarial losses	351	444	702	888
Amortization of prior service credits	(83)	(82)	(167)	(163)
Total net periodic benefit cost (credit)	273	357	546	713
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	3	4	7	9
Interest cost	24	23	48	46
Expected return on plan assets	(27)	(33)	(55)	(67)
Recognized net actuarial losses	0	1	1	2
Amortization of prior service credits	11	3	21	7
Total net periodic benefit cost (credit)	$ 11	$ (2)	$ 22	$ (3)