STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 25, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ 1,449	$ (776)
Other comprehensive income before reclassifications	(5)	55
Total reclassified from AOCL	232	303
Other comprehensive income, net of tax	227	358
Ending Balance	2,522	(111)
Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(14,254)	(12,559)
Other comprehensive income before reclassifications	0	0
Total reclassified from AOCL	227	300
Other comprehensive income, net of tax	227	300
Reclassification of income tax effects from tax reform		(2,396)
Ending Balance	(14,027)	(14,655)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(67)	20
Other comprehensive income before reclassifications	(5)	55
Total reclassified from AOCL	5	3
Other comprehensive income, net of tax	0	58
Reclassification of income tax effects from tax reform		(12)
Ending Balance	(67)	66
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(14,321)	(12,539)
Other comprehensive income, net of tax	227	358
Reclassification of income tax effects from tax reform		(2,408)
Ending Balance	(14,094)	(14,589)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	287	364
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	(60)	(64)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ 5	$ 3