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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. 29, 2025 | Jun. 30, 2024 | Jun. 29, 2025 | Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | $ 6,683 | $ 6,650 | $ 6,333 | $ 6,835
Other comprehensive income (loss) before reclassifications |  |  | 142 | (32)
Amounts reclassified from AOCL |  |  |  |
Total reclassified from AOCL |  |  | 153 | 66
Other comprehensive income, net of tax | 166 | 42 | 295 | 34
Ending Balance | 5,334 | 6,175 | 5,334 | 6,175
AOCL |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (8,323) | (8,811) | (8,452) | (8,803)
Amounts reclassified from AOCL |  |  |  |
Other comprehensive income, net of tax | 166 | 42 | 295 | 34
Ending Balance | (8,157) | (8,769) | (8,157) | (8,769)
Postretirement Benefit Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (8,288) | (8,704)
Other comprehensive income (loss) before reclassifications |  |  | 0 | 0
Amounts reclassified from AOCL |  |  |  |
Total reclassified from AOCL |  |  | 128 | 38
Other comprehensive income, net of tax |  |  | 128 | 38
Ending Balance | (8,160) | (8,666) | (8,160) | (8,666)
Total reclassified from AOCL | 64 | 19 |  |
Amortization of net actuarial losses |  |  |  |
Amounts reclassified from AOCL |  |  |  |
Total reclassified from AOCL |  |  | 110 | 94
Total reclassified from AOCL | 55 | 47 |  |
Amortization of net prior service credits |  |  |  |
Amounts reclassified from AOCL |  |  |  |
Total reclassified from AOCL |  |  | 18 | (56)
Total reclassified from AOCL | 9 | (28) |  |
Other, net |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (164) | (99)
Other comprehensive income (loss) before reclassifications |  |  | 142 | (32)
Amounts reclassified from AOCL |  |  |  |
Total reclassified from AOCL |  |  | 25 | 28
Other comprehensive income, net of tax |  |  | 167 | (4)
Ending Balance | $ 3 | $ (103) | 3 | (103)
Other |  |  |  |
Amounts reclassified from AOCL |  |  |  |
Total reclassified from AOCL |  |  | $ 25 | $ 28

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