Segment Information-Acquisition (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 07, 2016 USD ($)	Jul. 02, 2016 USD ($) $ / shares	Jul. 04, 2015 USD ($) $ / shares	Jul. 02, 2016 USD ($) segment $ / shares	Jul. 04, 2015 USD ($) $ / shares
Segment Information
Number of reportable segments | segment				6
Acquisition of business, cash consideration				$ 148
Christensen Farms & Feedlots, Inc. and Christensen Farms Midwest, LLC, Assets
Unaudited pro forma information:
Net sales		$ 1,357	$ 1,469	2,692	$ 2,958
Net earnings		$ 80	$ 36	$ 135	$ 68
Earnings per common share | $ / shares		$ 68.34	$ 30.46	$ 114.25	$ 57.71
Christensen Farms & Feedlots, Inc. and Christensen Farms Midwest, LLC, Assets | Pork
Segment Information
Acquisition of business, cash consideration	$ 148
Preliminary purchase price allocation
Inventories	33
Property, plant and equipment	111
Intangible assets	1
Goodwill	3
Total consideration transferred	148
Net sales from the date of acquisition		$ 34		$ 54
Christensen Farms & Feedlots, Inc. and Christensen Farms Midwest, LLC, Assets | Pork | Maximum
Preliminary purchase price allocation
Acquisition costs	$ 1
Christensen Farms & Feedlots, Inc. and Christensen Farms Midwest, LLC, Assets | Pork | Customer relationships
Preliminary purchase price allocation
Weighted average useful life (in years)	1 year 7 months 6 days