v3.25.4
Pension, Retiree Medical and Savings Plans (Estimated Future Benefit Payments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2026
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Jan. 22, 2026
Domestic Plan          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions/funding   $ 354 $ 236    
Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Discretionary   261 161 $ 267  
Non-discretionary   160 134 97  
Defined Benefit Plan, Expected Future Benefit Payment, Year One   1,259      
Defined Benefit Plan, Expected Future Benefit Payment, Year Two   963      
Defined Benefit Plan, Expected Future Benefit Payment, Year Three   951      
Defined Benefit Plan, Expected Future Benefit Payment, Year Four   977      
Defined Benefit Plan, Expected Future Benefit Payment, Year Five   999      
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years   5,242      
Employer contributions/funding   421 295 364  
Retiree Medical Plan          
Defined Benefit Plan Disclosure [Line Items]          
Discretionary   0 0 0  
Non-discretionary   51 53 46  
Defined Benefit Plan, Expected Future Benefit Payment, Year One   76      
Defined Benefit Plan, Expected Future Benefit Payment, Year Two   74      
Defined Benefit Plan, Expected Future Benefit Payment, Year Three   72      
Defined Benefit Plan, Expected Future Benefit Payment, Year Four   70      
Defined Benefit Plan, Expected Future Benefit Payment, Year Five   68      
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years   305      
Employer contributions/funding   51 53 46  
us-gaap_DomesticPlanMember-Discretionary contributions          
Defined Benefit Plan Disclosure [Line Items]          
Discretionary   250 $ 150 $ 250  
Years 2029 Through 2033          
Defined Benefit Plan Disclosure [Line Items]          
Subsidies expected to be received under the 2003 Medicare Act   2      
Maximum | Years 2024 Through 2028          
Defined Benefit Plan Disclosure [Line Items]          
Subsidies expected to be received under the 2003 Medicare Act   $ 1      
Forecast [Member] | Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Non-discretionary $ 80        
Forecast [Member] | Retiree Medical Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Non-discretionary $ 55        
Forecast [Member] | Domestic plan -Plan I          
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]          
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year         $ 200
Forecast [Member] | International plan          
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]          
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year         $ 52