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Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 25, 2021 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Average remaining service period of active plan participants, pension expense |  | 10 years |  |
Defined Benefit Plan, Average Remaining Service Period of Active Plan Participants, Retiree Medical Expense |  | 8 years |  |
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense |  | 23 years |  |
Pension strategy investment term, years |  | 5 years |  |
Defined Contribution Plan, Cost |  | $ 225 | $ 197 | $ 180
amortization corridor |  | 10.00% |  |
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets |  | 6.80% | 7.10% | 7.20%
Domestic - Plan A [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  | $ 205 | $ 220 |
Pre-tax non-cash settlement charge, net of tax, per share |  | $ 0.11 | $ 0.12 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  | $ 158 | $ 170 |
Domestic-Plan I [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  | $ 53 |
Pre-tax non-cash settlement charge, net of tax, per share |  |  | $ 0.03 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  | $ 41 |
Defined benefit plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  | $ 273 |
Pre-tax non-cash settlement charge, net of tax, per share |  | $ 0.11 | $ 0.03 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  | $ 41 |
Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pre-tax non-cash settlement charge, net of tax, per share |  |  | $ 0.12 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  | $ 170 |
Retiree Medical Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets |  | 5.80% | 6.60% | 6.50%
Defined Benefit Plan, Funded Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pre-tax non-cash settlement charge, net of tax, per share |  |  | $ 0.15 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  | $ 211 |
Forecast [Member] | Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets | 6.40% |  |  |
Pension Cost (Reversal of Cost) | $ 70 |  |  |
Forecast [Member] | Domestic - Plan A [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Average remaining service period of active plan participants, pension expense | 9 years |  |  |
Forecast [Member] | Domestic-Plan I [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense | 27 years |  |  |
Forecast [Member] | Domestic plan -Plan H [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Average remaining service period of active plan participants, pension expense | 11 years |  |  |
Pension Cost (Reversal of Cost) | $ 45 |  |  |

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