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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
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Net income attributable to MercadoLibre, Inc. per common share            
Net income per common share, Basic $ 2.43   $ 1.37   $ 3.73 $ 0.69
Net income per common share, Diluted $ 2.43   $ 1.37   $ 3.73 $ 0.69
Numerator:            
Net income $ 123 $ 65 $ 68 $ (34) $ 188 $ 34
Net income corresponding to common stock, Basic 123   68   188 34
Net income corresponding to common stock, Diluted $ 123   $ 68   $ 188 $ 34
Denominator:            
Weighted average of common stock outstanding for Basic earnings per share 50,364,529   49,822,272   50,386,519 49,844,823
Adjusted weighted average of common stock outstanding for Diluted earnings per share 50,364,529   49,822,272   50,386,519 49,844,823