POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 157	$ 159	$ 472	$ 476
Interest cost	435	459	1,305	1,377
Expected return on plan assets	(599)	(563)	(1,796)	(1,687)
Recognized net actuarial losses	444	376	1,332	1,129
Amortization of prior service credits	(81)	(89)	(244)	(265)
Total net periodic benefit cost	356	342	1,069	1,030
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	4	4	13	14
Interest cost	23	26	69	77
Expected return on plan assets	(34)	(31)	(101)	(95)
Recognized net actuarial losses	2	4	4	14
Amortization of prior service credits	4	4	11	11
Total net periodic benefit cost	$ (1)	$ 7	$ (4)	$ 21