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NET INCOME PER SHARE - Net Income Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Net income attributable to MercadoLibre, Inc. per common share                      
Net income per common share, Basic (in dollars per share) $ 7.83       $ 7.18       $ 25.09 $ 16.40  
Net income per common share, Diluted (in dollars per share) $ 7.83       $ 7.16       $ 25.09 $ 16.36  
Numerator:                      
Net income $ 397 $ 531 $ 344 $ 165 $ 359 [1] $ 262 $ 201 $ 463 $ 1,272 $ 822 [1] $ 987
Effect of dilutive 2028 Notes 0       0       0 1  
Net income available to common stock, Basic 397       359       1,272 822  
Net income available to common stock, Diluted $ 397       $ 359       $ 1,272 $ 823  
Denominator:                      
Weighted average of common stock outstanding for earnings per share, Basic (in shares) 50,697,438       50,008,320       50,697,442 50,137,826  
Adjustment for assumed conversions, Diluted (in shares) 0       201,119       0 201,119  
Adjusted weighted average of common stock outstanding for earnings per share, Diluted (in shares) 50,697,438       50,209,439       50,697,442 50,338,945  
[1] Recast for consistency with the current presentation due to the change in the presentation of certain financial results. Please refer to Note 2 – Summary of significant accounting policies - Change in the presentation of certain financial results and reclassification of prior year results.