Business Acquisitions Food Group - Purchase Price Allocation (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2020	Dec. 28, 2019
Business Acquisition [Line Items]
Goodwill	$ 5,644	$ 4,728
Customer Relationships
Business Acquisition [Line Items]
Customer relationships	736	$ 789
Food Group
Business Acquisition [Line Items]
Accounts receivable	145
Inventories	165
Assets of discontinued operations	130
Other current assets	7
Property and equipment	210
Goodwill	764
Other intangibles	695
Other assets	47
Accounts payable	(200)
Accrued expenses and other current liabilities	(69)
Liabilities of discontinued operations	(19)
Other long-term liabilities, including financing leases	(43)
Cash paid for acquisition	1,832
Indefinite-lived trade names	39
Food Group | Customer Relationships
Business Acquisition [Line Items]
Customer relationships	$ 656
Estimated useful lives of intangible assets (in years)	15 years