Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period of active plan participants, pension expense		10
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense		25
Average remaining service period of active plan participants, retiree medical expense		7
Pension strategy investment term, years		5 years
Defined Contribution Plan, Cost		$ 180	$ 176	$ 164
Pre-tax non-cash settlement charge				$ 242
Cost Savings Related to Reorganization of U.S. Pension Plans			42
Cost Savings Related to Reorganization of U.S. Pension Plans Net of Tax			$ 27
Cost Savings Related to Reorganization of U.S. Pension Plans Net of Tax, Earnings per Share			$ 0.02
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		7.20%	7.50%	7.50%
Discretionary contribution to fund pension settlement				$ 452
Pre-tax non-cash settlement charge				242
Pre-tax non-cash settlement charge, after-tax				$ 162
Pre-tax non-cash settlement charge, net of tax, per share				$ 0.11
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		6.50%	7.50%	7.50%
Subsequent Event [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.10%