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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 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income attributable to MercadoLibre, Inc. per common share                
Net income per common share, Basic [1] $ 2.57     $ 1.92     $ 6.30 $ 2.60
Net income per common share, Diluted [1] $ 2.56     $ 1.92     $ 6.29 $ 2.60
Numerator:                
Net income $ 129 $ 123 $ 65 $ 95 $ 68 $ (34) $ 317 $ 129
Effect of Dilutive Convertible Senior Notes 2           6  
Net income corresponding to common stock, Basic 129     95     317 129
Net income corresponding to common stock, Diluted $ 131     $ 95     $ 323 $ 129
Denominator:                
Weighted average of common stock outstanding for Basic earnings per share 50,325,075     49,597,157     50,365,813 49,761,360
Adjustment for assumed conversions 990,268           990,268  
Adjusted weighted average of common stock outstanding for Diluted earnings per share 51,315,343     49,597,157     51,356,081 49,761,360
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