STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ 3,171	$ 1,449
Other comprehensive income before reclassifications	5	(5)
Total reclassified from AOCL	8	232
Other comprehensive income, net of tax	13	227
Ending Balance	3,487	2,522
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	110	227
Other comprehensive income, net of tax	110	227
Ending Balance	(15,418)	(14,027)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(26)	(67)
Other comprehensive income before reclassifications	5	(5)
Total reclassified from AOCL	(102)	5
Other comprehensive income, net of tax	(97)	0
Ending Balance	(123)	(67)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(15,554)	(14,321)
Other comprehensive income, net of tax	13	227
Ending Balance	(15,541)	(14,094)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	172	287
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	(62)	(60)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ (102)	$ 5