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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Net income attributable to MercadoLibre, Inc. per common share                
Net income per common share, Basic (in dollars per share) $ 7.18     $ 2.57     $ 16.40 $ 6.30
Net income per common share, Diluted (in dollars per share) $ 7.16     $ 2.56     $ 16.36 $ 6.29
Numerator:                
Net income $ 359 $ 262 $ 201 $ 129 $ 123 $ 65 $ 822 $ 317
Effect of Dilutive Convertible Senior Notes 0     2     1 6
Net income corresponding to common stock, Basic 359     129     822 317
Net income corresponding to common stock, Diluted $ 359     $ 131     $ 823 $ 323
Denominator:                
Weighted average of outstanding common shares, Basic (in shares) 50,008,320     50,325,075     50,137,826 50,365,813
Adjustment for assumed conversions, Diluted (in shares) 201,119     990,268     201,119 990,268
Weighted average of outstanding common shares, Diluted (in shares) 50,209,439     51,315,343     50,338,945 51,356,081