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. 31, 2022	Dec. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit, Unfunded plans	$ 625
Domestic Plan [Member]
Selected information for plans with accumulated benefit obligation in excess of plan assets
Obligation for service to date	(584)	$ (1,499)
Fair value of plan assets		705
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	(620)	(1,709)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		705
Foreign Plan [Member]
Selected information for plans with accumulated benefit obligation in excess of plan assets
Obligation for service to date	(158)	(127)
Fair value of plan assets	129	102
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	(273)	(286)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	157	171
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	(714)	(954)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 196	$ 299