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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 09, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 000-29472    
Entity Registrant Name Amkor Technology, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 23-1722724    
Entity Address, Address Line One 2045 East Innovation Circle    
Entity Address, City or Town Tempe    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85284    
City Area Code 480    
Local Phone Number 821-5000    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol AMKR    
Security Exchange Name NASDAQ    
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     $ 3,067
Entity Common Stock, Shares Outstanding   245,892,019  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE:
Portions of the registrant’s Proxy Statement relating to its 2024 Annual Meeting of Stockholders, to be filed subsequently, are incorporated by reference into Part III of this Report where indicated.
    
Entity Central Index Key 0001047127    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false