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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. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions to employee benefit plans | $ 7 | $ 5 | $ 19 | $ 279 | $ 287
Total current year projected employer contributions | 25 |  | 25 |  |
Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions to employee benefit plans | 2 | 0 | 6 | 266 | 270
Total current year projected employer contributions | 7 |  | 7 |  |
Nonpension postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions to employee benefit plans | 5 | 5 | 13 | $ 13 | $ 17
Total current year projected employer contributions | $ 18 |  | $ 18 |  |
UNITED STATES | Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer discretionary contribution amount |  | $ 250 |  |  |

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