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Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Average remaining service period of active plan participants, pension expense |  | 10 |  |
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense |  | 25 |  |
Average remaining service period of active plan participants, retiree medical expense |  | 7 |  |
Pension strategy investment term, years |  | 5 years |  |
Defined Contribution Plan, Cost |  | $ 180 | $ 176 | $ 164
Pre-tax non-cash settlement charge |  |  |  | $ 242
Cost Savings Related to Reorganization of U.S. Pension Plans |  |  | 42 |
Cost Savings Related to Reorganization of U.S. Pension Plans Net of Tax |  |  | $ 27 |
Cost Savings Related to Reorganization of U.S. Pension Plans Net of Tax, Earnings per Share |  |  | $ 0.02 |
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets |  | 7.20% | 7.50% | 7.50%
Discretionary contribution to fund pension settlement |  |  |  | $ 452
Pre-tax non-cash settlement charge |  |  |  | 242
Pre-tax non-cash settlement charge, after-tax |  |  |  | $ 162
Pre-tax non-cash settlement charge, net of tax, per share |  |  |  | $ 0.11
Retiree Medical Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets |  | 6.50% | 7.50% | 7.50%
Subsequent Event [Member] | Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets | 7.10% |  |  |

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