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Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2022
Nov. 03, 2022
Entity Address [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-33647  
Entity Registrant Name MercadoLibre, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 98-0212790  
Entity Address, Address Line One WTC Free Zone  
Entity Address, Address Line Two Dr. Luis Bonavita 1294  
Entity Address, Address Line Three Of. 1733, Tower II  
Entity Address, City or Town Montevideo  
Entity Address, Country UY  
Entity Address, Postal Zip Code 11300  
Country Region +598  
City Area Code 2  
Local Phone Number 927-2770  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   50,294,893
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001099590  
Amendment Flag false  
Common Stock [Member]    
Entity Address [Line Items]    
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol MELI  
Security Exchange Name NASDAQ  
2.375% Sustainability Notes Due 2026 [Member]    
Entity Address [Line Items]    
Title of 12(b) Security 2.375% Sustainability Notes due 2026  
Trading Symbol MELI26  
Security Exchange Name NASDAQ  
3.125 % Notes Due 2031 [Member]    
Entity Address [Line Items]    
Title of 12(b) Security 3.125% Notes due 2031  
Trading Symbol MELI31  
Security Exchange Name NASDAQ