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STOCKHOLDERS' EQUITY - Schedule of Changes in the Balance of AOCL, Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2017 | Sep. 25, 2016 | Sep. 24, 2017 | Sep. 25, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | $ 1,606 | $ 3,097
Other comprehensive income (loss) before reclassifications |  |  | 126 | (46)
Total reclassified from AOCL |  |  | 616 | 499
Other comprehensive income, net of tax | $ 277 | $ 113 | 742 | 453
Ending Balance | 2,175 | 2,430 | 2,175 | 2,430
Amounts reclassified from accumulated other comprehensive loss, net of tax | 200 | 175 | 602 | 521
Net actuarial losses | 258 | 234 |  |
Amortization of net prior service credits | (58) | (59) |  |
Postretirement Benefit Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | (11,981) | (11,314)
Other comprehensive income (loss) before reclassifications |  |  | 3 |
Total reclassified from AOCL |  |  | 602 | 387
Other comprehensive income, net of tax |  |  | 605 | 387
Ending Balance | (11,376) | (10,927) | (11,376) | (10,927)
Other, net |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | (121) | (130)
Other comprehensive income (loss) before reclassifications |  |  | 123 | (46)
Total reclassified from AOCL |  |  | 14 | 112
Other comprehensive income, net of tax |  |  | 137 | 66
Ending Balance | 16 | (64) | 16 | (64)
AOCL |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | (12,102) | (11,444)
Other comprehensive income, net of tax |  |  | 742 | 453
Ending Balance | $ (11,360) | $ (10,991) | (11,360) | (10,991)
Recognition of net actuarial losses |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | 774 | 703
Amortization of net prior service credits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | (172) | (182)
Recognition of net prior service credits from divestiture of IS&GS |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  |  | (134)
Other |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | $ 14 | $ 112

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