POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 24, 2018	Jun. 25, 2017	Jun. 24, 2018	Jun. 25, 2017
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 158	$ 158	$ 315	$ 317
Interest cost	435	460	870	918
Expected return on plan assets	(598)	(562)	(1,197)	(1,124)
Recognized net actuarial losses	444	377	888	753
Amortization of prior service credits	(82)	(90)	(163)	(176)
Total net periodic benefit cost	357	343	713	688
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	4	5	9	10
Interest cost	23	25	46	51
Expected return on plan assets	(33)	(32)	(67)	(64)
Recognized net actuarial losses	1	5	2	10
Amortization of prior service credits	3	4	7	7
Total net periodic benefit cost	$ (2)	$ 7	$ (3)	$ 14