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Employee Benefits - Components of Plan Benefit Expense Narrative (Details) - UNITED STATES - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 28, 2019 | Sep. 26, 2020 | Jun. 27, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Pension |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Curtailment (gain) loss | $ (11) |  | $ (7) |  |  |
Recognized net (gain) loss |  | $ 7 |  | $ 15 | $ 15 | $ 26
Pension | Mark-to-Market Loss |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Recognized net (gain) loss | 8 |  | $ 49 |  |  |
Other Nonpension Postretirement |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Curtailment (gain) loss | (6) |  |  |  |  |
Other Nonpension Postretirement | Mark-to-Market Loss |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Recognized net (gain) loss | $ (55) |  |  |  |  |
Maximum [Member] | Pension |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.50% |  |  |  |  |
Maximum [Member] | Other Nonpension Postretirement |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.50% |  |  |  |  |
Minimum [Member] | Pension |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.00% |  |  |  |  |
Minimum [Member] | Other Nonpension Postretirement |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.00% |  |  |  |  |

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