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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. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance | $ 2,896 | $ 479 | $ 1,449 | $ (776)
Other comprehensive income before reclassifications |  |  | (30) | (53)
Total reclassified from AOCL |  |  | 698 | 923
Other comprehensive income, net of tax | 186 | 318 | 668 | 870
Ending Balance | 3,937 | 1,002 | 3,937 | 1,002
Recognition of previously deferred postretirement benefit plan amounts | 227 | 300 | 681 | 900
Postretirement Benefit Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | (14,254) | (12,559)
Other comprehensive income before reclassifications |  |  | 0 | 0
Total reclassified from AOCL |  |  | 681 | 900
Other comprehensive income, net of tax |  |  | 681 | 900
Reclassification of income tax effects from tax reform |  |  |  | (2,396)
Ending Balance | (13,573) | (14,055) | (13,573) | (14,055)
Other, net |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | (67) | 20
Other comprehensive income before reclassifications |  |  | (30) | (53)
Total reclassified from AOCL |  |  | 17 | 23
Other comprehensive income, net of tax |  |  | (13) | (30)
Reclassification of income tax effects from tax reform |  |  |  | (12)
Ending Balance | (80) | (22) | (80) | (22)
AOCL |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance | (13,839) | (14,395) | (14,321) | (12,539)
Other comprehensive income, net of tax | 186 | 318 | 668 | 870
Reclassification of income tax effects from tax reform |  |  |  | (2,408)
Ending Balance | (13,653) | (14,077) | (13,653) | (14,077)
Recognition of net actuarial losses |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | 861 | 1,092
Recognition of previously deferred postretirement benefit plan amounts | 287 | 364 |  |
Amortization of net prior service credits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | (180) | (192)
Recognition of previously deferred postretirement benefit plan amounts | $ (60) | $ (64) |  |
Other |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Total reclassified from AOCL |  |  | $ 17 | $ 23

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