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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Feb. 07, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name AMGEN INC    
Entity Central Index Key 0000318154    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 119,629,312,769
Entity Common Stock, Shares Outstanding   622,278,034  
Shares of common stock held by directors and executive officers     884,143