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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Aug. 12, 2015
Entity Information [Line Items]          
Entity Registrant Name     SMITHFIELD FOODS INC    
Entity Central Index Key     0000091388    
Current Fiscal Year End Date     --01-03    
Entity Filer Category     Non-accelerated Filer    
Document Type     10-Q    
Document Period End Date     Jun. 28, 2015    
Document Fiscal Year Focus     2015    
Net Income (Loss) Attributable to Parent $ 104.2 $ 142.9 $ 201.2 $ 248.2  
Document Fiscal Period Focus     Q2    
Amendment Flag     false    
Entity Common Stock, Shares Outstanding         1,000