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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) $ / shares in Units, satellite in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 03, 2021 USD ($) satellite | Sep. 26, 2021 USD ($) $ / shares | Sep. 27, 2020 USD ($) | Sep. 26, 2021 USD ($) $ / shares | Sep. 27, 2020 USD ($) | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax |  | $ 137,000,000 | $ 140,000,000 | $ 492,000,000 | $ 420,000,000 |
Recognition of previously deferred postretirement benefit plan amounts, net of tax |  | 107,000,000 | 110,000,000 | 387,000,000 | 330,000,000 |
Outstanding pension benefit obligations and related plan assets | $ 4,900,000,000 |  |  |  |  |
Non-cash, non-operating pension settlement charge |  | 1,700,000,000 |  | 1,700,000,000 |  |
Non-cash, non-operating pension settlement charge, after tax |  | $ 1,300,000,000 |  | $ 1,300,000,000 |  |
Non-cash, non-operating pension settlement charge, per share, after Tax (in dollars per share) | $ / shares |  | $ 4.72 |  | $ 4.72 |  |
Qualified defined benefit pension plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Benefit obligation, discount rate | 2.75% |  |  |  |  | 2.50%
Change in benefit obligation due to remeasurement |  |  |  | $ 1,253,000,000 |  |
Company contributions |  | $ 0 | 0 | 0 | 0 |
Qualified defined benefit pension plans | Qualified Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Outstanding pension benefit obligations and related plan assets | $ 4,900,000,000 |  |  |  |  |
Number of retirees and beneficiaries | satellite | 18 |  |  |  |  |
Decrease in defined benefit plan, remeasurements | $ 2,900,000,000 |  |  |  |  |
Change in benefit obligation due to remeasurement | 1,300,000,000 |  |  |  |  |
Increase in defined benefit plan, pension plan assets, incremental return | 1,600,000,000 |  |  |  |  |
Defined benefit pension plans resulted | $ 2,300,000,000 |  |  |  |  |
Qualified defined benefit pension plans | Qualified Plan | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Benefit obligation, discount rate | 6.50% |  |  |  |  |
Qualified defined benefit pension plans | Qualified Plan | Maximum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Benefit obligation, discount rate | 7.00% |  |  |  |  |
Retiree medical and life insurance plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Recognition of previously deferred postretirement benefit plan amounts, before tax |  | $ 6,000,000 | $ 4,000,000 | $ 13,000,000 | $ 14,000,000 |

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