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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
Feb. 22, 2018
Jun. 30, 2017
Document And Entity Information [Abstract]      
Document Type 8-K    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Registrant Name CROWN HOLDINGS INC    
Entity Central Index Key 0001219601    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   134,309,260  
Entity Public Float     $ 8,073,323,168