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Pension, Retiree Medical and Savings Plans (Estimated Future Benefit Payments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 30, 2023
Dec. 31, 2022
Dec. 25, 2021
Domestic Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions/funding   $ 314 $ 235  
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Discretionary   267 160 $ 525
Non-discretionary   97 176 213
Defined Benefit Plan, Expected Future Benefit Payment, Year One   1,102    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two   925    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three   964    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four   996    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five   1,023    
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years   5,403    
Employer contributions/funding   364 336 738
Retiree Medical Plan        
Defined Benefit Plan Disclosure [Line Items]        
Discretionary   0 0 0
Non-discretionary   46 48 47
Defined Benefit Plan, Expected Future Benefit Payment, Year One   81    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two   80    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three   76    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four   74    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five   70    
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years   309    
Employer contributions/funding   46 48 47
us-gaap_DomesticPlanMember-Discretionary contributions        
Defined Benefit Plan Disclosure [Line Items]        
Discretionary   250 $ 150 $ 500
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 $ 99      
Forecast [Member] | Retiree Medical Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Non-discretionary $ 51      
Forecast [Member] | Domestic plan -Plan H [Member]        
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]        
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description 150 million