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Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions to employee benefit plans | $ 7 | $ 7 | $ 19 | $ 19 | $ 28
Total current year projected employer contributions | 26 |  | 26 |  |
Global Plans | Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions to employee benefit plans | 1 | 2 | 4 | 6 | 10
Total current year projected employer contributions | 7 |  | 7 |  |
U.S. and Canada | Nonpension postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions to employee benefit plans | 6 | $ 5 | 15 | $ 13 | $ 18
Total current year projected employer contributions | $ 19 |  | $ 19 |  |

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