STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ 6,038	$ 3,171
Other comprehensive loss before reclassifications	(26)	5
Total reclassified from AOCL	139	8
Other comprehensive income, net of tax	113	13
Ending Balance	6,333	3,487
Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(16,155)	(15,528)
Other comprehensive loss before reclassifications	0	0
Total reclassified from AOCL	140	110
Other comprehensive income, net of tax	140	110
Ending Balance	(16,015)	(15,418)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	34	(26)
Other comprehensive loss before reclassifications	(26)	5
Total reclassified from AOCL	(1)	(102)
Other comprehensive income, net of tax	(27)	(97)
Ending Balance	7	(123)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(16,121)	(15,554)
Other comprehensive income, net of tax	113	13
Ending Balance	(16,008)	(15,541)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	204	172
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	(64)	(62)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ (1)	$ (102)