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Document and Entity Information Document - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-33156    
Entity Registrant Name First Solar, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-4623678    
Entity Address, Address Line One 350 West Washington Street, Suite 600    
Entity Address, City or Town Tempe    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85288    
City Area Code 602    
Local Phone Number 414-9300    
Title of 12(b) Security Common stock, $0.001 par value    
Trading Symbol FSLR    
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     $ 24.0
Entity Common Stock, Shares Outstanding   107,062,105  
Documents Incorporated by Reference
The information required by Part III of this Form 10-K, to the extent not set forth herein, is incorporated by reference from the registrant’s definitive proxy statement relating to the Annual Meeting of Shareholders to be held in 2025, which will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Form 10-K relates.
    
Entity Central Index Key 0001274494    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false