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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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Net income attributable to MercadoLibre, Inc. per common share            
Net income per common share, Basic (in dollars per share) $ 5.22   $ 2.43   $ 9.23 $ 3.73
Net income per common share, Diluted (in dollars per share) $ 5.16   $ 2.43   $ 9.12 $ 3.73
Numerator:            
Net income $ 262 $ 201 $ 123 $ 65 $ 463 $ 188
Effect of Dilutive Convertible Senior Notes 2   0   4 0
Net income corresponding to common stock, Basic 262   123   463 188
Net income corresponding to common stock, Diluted $ 264   $ 123   $ 467 $ 188
Denominator:            
Weighted average of outstanding common shares, Basic (in shares) 50,162,687   50,364,529   50,203,652 50,386,519
Adjustment for assumed conversions, Diluted (in shares) 990,268   0   990,268 0
Weighted average of outstanding common shares, Diluted (in shares) 51,152,955   50,364,529   51,193,920 50,386,519