POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 129	$ 157	$ 387	$ 472
Interest cost	452	435	1,355	1,305
Expected return on plan assets	(575)	(599)	(1,725)	(1,796)
Recognized net actuarial losses	351	444	1,053	1,332
Amortization of prior service credits	(83)	(81)	(250)	(244)
Total net periodic benefit cost (credit)	274	356	820	1,069
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	4	4	11	13
Interest cost	25	23	73	69
Expected return on plan assets	(28)	(34)	(83)	(101)
Recognized net actuarial losses	1	2	2	4
Amortization of prior service credits	10	4	31	11
Total net periodic benefit cost (credit)	$ 12	$ (1)	$ 34	$ (4)