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Cover page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 09, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37702    
Entity Registrant Name Amgen Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-3540776    
Entity Address, Address Line One One Amgen Center Drive    
Entity Address, City or Town Thousand Oaks    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91320-1799    
City Area Code 805    
Local Phone Number 447-1000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 118,556,278,405
Entity Common Stock, Shares Outstanding   535,918,901  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Specified portions of the registrant’s Proxy Statement with respect to the 2024 Annual Meeting of Stockholders to be held on May 31, 2024, are incorporated by reference into Part III of this annual report.
    
Entity Central Index Key 0000318154    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Common Stock      
Entity Information [Line Items]      
Title of 12(b) Security Common stock, $0.0001 par value    
Trading Symbol AMGN    
Security Exchange Name NASDAQ    
2.00% Senior Notes Due 2026      
Entity Information [Line Items]      
Title of 12(b) Security 2.00% Senior Notes due 2026    
Trading Symbol AMGN26    
Security Exchange Name NASDAQ