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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 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2023
Net income attributable to MercadoLibre, Inc. per common share            
Net income per common share, Basic (in dollars per share) $ 6.78       $ 4.01  
Net income per common share, Diluted (in dollars per share) $ 6.78       $ 3.97  
Numerator:            
Net income $ 344 $ 165 $ 359 $ 262 $ 201 [1] $ 987
Effect of dilutive 2028 Notes 0       2  
Net income corresponding to common stock, Basic 344       201  
Net income corresponding to common stock, Diluted $ 344       $ 203  
Denominator:            
Weighted average of outstanding common shares, Basic (in shares) 50,697,442       50,245,073  
Adjustment for assumed conversions, Diluted (in shares) 0       990,268  
Weighted average of outstanding common shares, Diluted (in shares) 50,697,442       51,235,341  
[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.