v3.25.4
Pension, Retiree Medical and Savings Plans (Selected Information About Plans with Liability for Service to Date and Total Benefit Liability in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 27, 2025
Dec. 28, 2024
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit, Unfunded plans $ 632  
Domestic Plan    
Selected information for plans with accumulated benefit obligation in excess of plan assets    
Obligation for service to date (7,123) $ (7,315)
Fair value of plan assets 6,480 6,399
Selected information for plans with projected benefit obligation in excess of plan assets    
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation (7,126) (7,502)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 6,480 6,399
Foreign Plan [Member]    
Selected information for plans with accumulated benefit obligation in excess of plan assets    
Obligation for service to date (279) (194)
Fair value of plan assets 177 135
Selected information for plans with projected benefit obligation in excess of plan assets    
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation (435) (346)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 177 165
Retiree Medical Plan    
Selected information for plans with projected benefit obligation in excess of plan assets    
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation (623) (616)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets $ 155 $ 163