STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ 3,487	$ 2,522	$ 3,171	$ 1,449
Other comprehensive income before reclassifications			3	13
Total reclassified from AOCL	110	227	148	469
Other comprehensive income, net of tax	138	255	151	482
Ending Balance	3,786	2,896	3,786	2,896
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			220	454
Other comprehensive income, net of tax			220	454
Ending Balance	(15,308)	(13,800)	(15,308)	(13,800)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance			(26)	(67)
Other comprehensive income before reclassifications			3	13
Total reclassified from AOCL			(72)	15
Other comprehensive income, net of tax			(69)	28
Ending Balance	(95)	(39)	(95)	(39)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(15,541)	(14,094)	(15,554)	(14,321)
Other comprehensive income, net of tax	138	255	151	482
Ending Balance	(15,403)	(13,839)	(15,403)	(13,839)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	172	287	344	574
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ (62)	$ (60)	(124)	(120)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL			$ (72)	$ 15