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Leases - Additional information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Property, plant and equipment  
Rental expense for operating leases $ 46
Pork | Contract grower agreements  
Property, plant and equipment  
Amount paid under the agreement 48
Marine and CT&M | Vessel, time and voyage-charters  
Property, plant and equipment  
Amount paid under the contract $ 111