v3.25.4
Pension, Retiree Medical and Savings Plans (Components of Benefit Expense) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 312 $ 347 $ 327
Interest cost 586 585 593
Expected return on plan assets (805) (871) (851)
Amortization of prior service costs/(credits) 3 (24) (26)
Amortization of net losses/(gains) 84 77 70
Net settlement/curtailment losses (a) 247 254 4
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 21 31 (1)
Defined Benefit Plan, Other Cost (Credit) (136) (52) 211
Total $ 448 399 116
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    
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax 237    
International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 47 46 43
Interest cost 152 144 141
Expected return on plan assets (202) (205) (192)
Amortization of prior service costs/(credits) (1) (2) (1)
Amortization of net losses/(gains) 27 21 13
Net settlement/curtailment losses (a) 32 22 10
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 0 0  
Special termination benefits 0 0 0
Defined Benefit Plan, Other Cost (Credit) (8) 20 29
Total 55 26 14
Retiree Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 31 31 29
Interest cost 30 32 36
Expected return on plan assets (11) (13) (13)
Amortization of prior service costs/(credits) (5) (5) (6)
Amortization of net losses/(gains) (25) (25) (27)
Net settlement/curtailment losses (a) 0 0 0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 0 (1)  
Special termination benefits 0 1 0
Defined Benefit Plan, Other Cost (Credit) 11 10 10
Total $ 20 $ 21 $ 19
Domestic-Plan I [Member]      
Defined Benefit Plan Disclosure [Line Items]      
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 $ 165  
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax $ 237 $ 213