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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Entity Registrant Name CHEMICAL & MINING CO OF CHILE INC
Entity Central Index Key 0000909037
Current Fiscal Year End Date --12-31
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
Trading Symbol SQM
Entity Common Stock, Shares Outstanding 263,196,524
Entity Shell Company false
Entity Emerging Growth Company false
Title of 12(b) Security Series B common shares, in the form of American Depositary Shares each representing one Series B share
Security Exchange Name NYSE
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
ICFR Auditor Attestation Flag true
Document Accounting Standard International Financial Reporting Standards
Series A Common Shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 142,819,552
Series B Common Shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 120,376,972