POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 25, 2018	Mar. 26, 2017
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 157	$ 159
Interest cost	435	458
Expected return on plan assets	(599)	(562)
Recognized net actuarial losses	444	376
Amortization of prior service credits	(81)	(86)
Total net periodic benefit cost	356	345
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	5	5
Interest cost	23	26
Expected return on plan assets	(34)	(32)
Recognized net actuarial losses	1	5
Amortization of prior service credits	4	3
Total net periodic benefit cost	$ (1)	$ 7