STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ 3,786	$ 2,896	$ 3,171	$ 1,449
Other comprehensive income before reclassifications			(40)	(30)
Total reclassified from AOCL	110	227	335	698
Other comprehensive income, net of tax	144	186	295	668
Ending Balance	4,986	3,937	4,986	3,937
Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance			(15,528)	(14,254)
Other comprehensive income before reclassifications			0	0
Total reclassified from AOCL			330	681
Other comprehensive income, net of tax			330	681
Ending Balance	(15,198)	(13,573)	(15,198)	(13,573)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance			(26)	(67)
Other comprehensive income before reclassifications			(40)	(30)
Total reclassified from AOCL			5	17
Other comprehensive income, net of tax			(35)	(13)
Ending Balance	(61)	(80)	(61)	(80)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(15,403)	(13,839)	(15,554)	(14,321)
Other comprehensive income, net of tax	144	186	295	668
Ending Balance	(15,259)	(13,653)	(15,259)	(13,653)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	173	287	517	861
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ (63)	$ (60)	(187)	(180)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL			$ 5	$ 17