Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Pension strategy investment term, years		5 years
Defined Contribution Plan, Cost		$ 246	$ 225	$ 197
amortization corridor		10.00%
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax		$ 54	$ 227	$ 308
Defined Benefit Plan, Average Remaining Service Period of Active Plan Participants, Retiree Medical Expense		9 years
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		6.40%	6.80%	7.10%
Pension Cost (Reversal of Cost)		$ 70
Domestic - Plan A [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax			$ 205	$ 220
Average remaining service period of active plan participants, pension expense		9 years
Pre-tax non-cash settlement charge, net of tax, per share			$ 0.11	$ 0.12
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax			$ 158	$ 170
Domestic-Plan I [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax				$ 53
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense		27 years
Pre-tax non-cash settlement charge, net of tax, per share				$ 0.03
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax				$ 41
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pre-tax non-cash settlement charge, net of tax, per share				$ 0.12
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax				$ 170
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		5.40%	5.80%	6.60%
Domestic plan -Plan H [Member]
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period of active plan participants, pension expense		11 years
Pension Cost (Reversal of Cost)		$ 45
Defined Benefit Plan, Funded Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax				$ 273
Pre-tax non-cash settlement charge, net of tax, per share				$ 0.15
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax				$ 211
Forecast [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	6.30%
Defined Benefit Plan, Benefit Obligation, Divestiture	$ 150