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Segment Information - Pork Segment (Details)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Segment Information          
Number of reportable segments | segment       6  
One-time Federal blender's credits recognized as revenue     $ 17    
Forecast          
Segment Information          
One-time Federal blender's credits recognized as revenue   $ 42      
Pork          
Segment Information          
One-time Federal blender's credits recognized as revenue     $ 17    
Pork | New Fashion Pork, LLP          
Segment Information          
Acquisition of business, cash consideration $ 40        
Pork | Hog growing operations          
Segment Information          
Acquisition of business, cash consideration       $ 40 $ 219