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STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning Balance $ 6,333 $ 3,487 $ 6,038 $ 3,171
Other comprehensive income before reclassifications     2 3
Total reclassified from AOCL 140 110 282 148
Other comprehensive income, net of tax 171 138 284 151
Ending Balance 6,530 3,786 6,530 3,786
Postretirement Benefit Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning Balance     (16,155) (15,528)
Other comprehensive income before reclassifications     0 0
Total reclassified from AOCL     280 220
Other comprehensive income, net of tax     280 220
Ending Balance (15,875) (15,308) (15,875) (15,308)
Other, net        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning Balance     34 (26)
Other comprehensive income before reclassifications     2 3
Total reclassified from AOCL     2 (72)
Other comprehensive income, net of tax     4 (69)
Ending Balance 38 (95) 38 (95)
AOCL        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning Balance (16,008) (15,541) (16,121) (15,554)
Other comprehensive income, net of tax 171 138 284 151
Ending Balance (15,837) (15,403) (15,837) (15,403)
Recognition of net actuarial losses        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Total reclassified from AOCL 204 172 408 344
Amortization of net prior service credits        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Total reclassified from AOCL $ (64) $ (62) (128) (124)
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Total reclassified from AOCL     $ 2 $ (72)