Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension strategy investment term, years		5 years
Defined Contribution Plan, Cost		$ 356	$ 283	$ 246
amortization corridor		10.00%
Defined Benefit Plan, Average Remaining Service Period of Active Plan Participants, Retiree Medical Expense		10 years
Minimum Real estate notice period		45 days
Maximum Real estate notice period		90 days
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax			$ 318
Expected return on plan assets (a)		7.40%	6.70%	6.40%
Pre-tax non-cash settlement charge, net of tax, per share			$ 0.18
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax			$ 246
Defined Benefit Plan, Benefit Obligation, Divestiture			145
Defined Benefit Plan, Plan Assets, Amount		$ 11,541	$ 11,148	$ 15,904
Domestic-Plan I [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense		26 years
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets (a)		7.10%	5.70%	5.40%
Defined Benefit Plan, Plan Assets, Amount		$ 183	$ 196	$ 299
Domestic plan -Plan H [Member]
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period of active plan participants, pension expense		11 years
Defined Benefit Plan, Equity Securities, US, Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Representation As Percentage Of Total US Plan Assets		13.00%	10.00%
Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		31.00%	32.00%
Forecast [Member] | Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets (a)	7.40%