Derivatives and Fair Value of Financial Instruments-Derivatives (Details) lb in Millions, gal in Millions, bu in Millions, $ in Millions	3 Months Ended	12 Months Ended		24 Months Ended
	Apr. 02, 2016 USD ($) agreement item lb gal bu	Dec. 31, 2015 USD ($) agreement lb bu	Dec. 31, 2010 USD ($) agreement	Dec. 31, 2015 USD ($) agreement
Net commodity purchase contracts | Grain
Derivative commodity instruments
Nonmonetary notional amount | bu	18	22
Net commodity purchase contracts | Sugar
Derivative commodity instruments
Nonmonetary notional amount | lb		3
Net commodity purchase contracts | Hogs
Derivative commodity instruments
Nonmonetary notional amount | lb		25
Net commodity sale contracts | Hogs
Derivative commodity instruments
Nonmonetary notional amount | lb	105
Net commodity sale contracts | Soybean oil
Derivative commodity instruments
Nonmonetary notional amount | lb		8
Net commodity sale contracts | Heating oil
Derivative commodity instruments
Nonmonetary notional amount | gal	2
Foreign currencies
Derivative commodity instruments
Notional amounts | $	$ 162	$ 94		$ 94
Interest rate swaps
Derivative commodity instruments
Notional amounts | $	$ 75	$ 119	$ 25	$ 119
Number of derivative agreements | agreement	3	5	3	5
Term of derivative contract			10 years
Eight-year interest rate exchange agreements
Derivative commodity instruments
Notional amounts | $		$ 22		$ 22
Number of derivative instruments entered into | agreement				4
Number of derivative agreements | agreement		2		2
Term of derivative contract				8 years
Number of bulk vessels delivered | item	2
Payments to unwind interest rate exchange agreements | $	$ 2