v3.25.4
Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 26, 2026
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Pension strategy investment term, years   5 years    
Defined Contribution Plan, Cost   $ 434,000,000 $ 411,000,000 $ 356,000,000
amortization corridor   10.00%    
Defined Benefit Plan, Average Remaining Service Period of Active Plan Participants, Retiree Medical Expense   12 years    
Reporting Unit, Zero or Negative Carrying Amount, Number   0    
Domestic Plan        
Defined Benefit Plan Disclosure [Line Items]        
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax   $ 237,000,000    
Expected return on plan assets   7.50% 7.40% 7.40%
Pre-tax non-cash settlement charge, net of tax, per share   $ 0.13    
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax   $ 183,000,000    
Defined Benefit Plan, Plan Assets, Amount   10,949,000,000 $ 10,609,000,000 $ 11,541,000,000
Domestic-Plan I [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax   $ 237,000,000 $ 213,000,000  
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense   26 years    
Pre-tax non-cash settlement charge, net of tax, per share   $ 0.13 $ 0.12  
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax   $ 183,000,000 $ 165,000,000  
Retiree Medical Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected return on plan assets   7.10% 7.10% 7.10%
Defined Benefit Plan, Plan Assets, Amount   $ 155,000,000 $ 163,000,000 $ 183,000,000
Domestic plan -Plan H [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Average remaining service period of active plan participants, pension expense   10 years    
Forecast [Member] | Domestic Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected return on plan assets 7.80%