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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 25, 2023 | Jun. 30, 2024 | Jun. 25, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Credit (cost) recognition of previously deferred postretirement benefit plan amounts, before tax | $ 24,000,000 | $ (47,000,000) | $ 48,000,000 | $ (94,000,000)
Amortization of actuarial gains (losses), net of tax | 19,000,000 | (37,000,000) | 38,000,000 | (74,000,000)
Material contributions to qualified defined benefit pension plans | 0 | 0 | 0 | 0
Retiree medical and life insurance plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Credit (cost) recognition of previously deferred postretirement benefit plan amounts, before tax | $ 4,000,000 | $ 4,000,000 | $ 8,000,000 | $ 7,000,000

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