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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. 24, 2018 | Jun. 25, 2017 | Jun. 24, 2018 | Jun. 25, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | $ (776) | $ 1,477
Other comprehensive income before reclassifications |  |  | (62) | 56
Total reclassified from AOCL |  |  | 614 | 409
Other comprehensive income, net of tax | $ 194 | $ 255 | 552 | 465
Reclassification of income tax effects from tax reform |  |  | 2,400 |
Ending Balance | 479 | 1,259 | 479 | 1,259
Amounts reclassified from accumulated other comprehensive loss | 300 | 200 | 600 | 402
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 |  |  | 600 | 402
Other comprehensive income, net of tax |  |  | 600 | 405
Reclassification of income tax effects from tax reform |  |  | (2,396) |
Ending Balance | (14,355) | (11,576) | (14,355) | (11,576)
Other, net |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | 20 | (121)
Other comprehensive income before reclassifications |  |  | (62) | 53
Total reclassified from AOCL |  |  | 14 | 7
Other comprehensive income, net of tax |  |  | (48) | 60
Reclassification of income tax effects from tax reform |  |  | (12) |
Ending Balance | (40) | (61) | (40) | (61)
AOCL |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | (12,539) | (12,102)
Other comprehensive income, net of tax |  |  | 552 | 465
Reclassification of income tax effects from tax reform |  |  | (2,408) |
Ending Balance | (14,395) | (11,637) | (14,395) | (11,637)
Recognition of net actuarial losses |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | 728 | 516
Amortization of net prior service credits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | (128) | (114)
Other |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | $ 14 | $ 7
Postretirement Benefit Plan Adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 300 | 200 |  |
Recognition of net actuarial losses | 364 | 258 |  |
Amortization of net prior service credits | $ (64) | $ (58) |  |

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