STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020	Aug. 03, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	$ 6,530	$ 3,786	$ 6,038	$ 3,171
Other comprehensive loss before reclassifications			2,203	(40)
Total reclassified from AOCL	107	110	1,701	335
Other comprehensive income, net of tax	3,620	144	3,904	295
Ending Balance	9,631	4,986	9,631	4,986
Outstanding pension benefit obligations and related plan assets					$ 4,900
Non-cash, non-operating pension settlement charge	$ 1,700
Non-cash, non-operating pension settlement charge per share, after tax	$ 4.72
Non-cash, non-operating pension settlement charge, after tax	$ 1,300
Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance			(16,155)	(15,528)
Other comprehensive loss before reclassifications			2,258	0
Total reclassified from AOCL			1,697	330
Other comprehensive income, net of tax			3,955	330
Ending Balance	(12,200)	(15,198)	(12,200)	(15,198)
Other, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance			34	(26)
Other comprehensive loss before reclassifications			(55)	(40)
Total reclassified from AOCL			4	5
Other comprehensive income, net of tax			(51)	(35)
Ending Balance	(17)	(61)	(17)	(61)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning Balance	(15,837)	(15,403)	(16,121)	(15,554)
Other comprehensive income, net of tax	3,620	144	3,904	295
Ending Balance	(12,217)	(15,259)	(12,217)	(15,259)
Recognition of net actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	171	173	579	517
Amortization of net prior service credits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL	$ (64)	$ (63)	(192)	(187)
Recognition of settlement loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL			1,310
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Total reclassified from AOCL			$ 4	$ 5