STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 25, 2018	Mar. 26, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ (776)	$ 1,477
Other comprehensive income before reclassifications	55	7
Total reclassified from AOCL	303	203
Other comprehensive income, net of tax	358	210
Reclassification of income tax effects from tax reform	2,400
Ending Balance	(111)	1,482
Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(12,559)	(11,981)
Other comprehensive income before reclassifications	0	3
Total reclassified from AOCL	300	202
Other comprehensive income, net of tax	300	205
Reclassification of income tax effects from tax reform	(2,396)
Ending Balance	(14,655)	(11,776)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	20	(121)
Other comprehensive income before reclassifications	55	4
Total reclassified from AOCL	3	1
Other comprehensive income, net of tax	58	5
Reclassification of income tax effects from tax reform	(12)
Ending Balance	66	(116)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(12,539)	(12,102)
Other comprehensive income, net of tax	358	210
Reclassification of income tax effects from tax reform	(2,408)
Ending Balance	(14,589)	(11,892)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	364	258
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	(64)	(56)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ 3	$ 1