Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 29, 2018
Jun. 05, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 29, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Registrant Name Kraft Heinz Co    
Entity Central Index Key 0001637459    
Current Fiscal Year End Date --12-29    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Current Reporting Status No    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 38
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   1,219,938,804