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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
Mar. 31, 2023
Mar. 31, 2022
Net income attributable to MercadoLibre, Inc. per common share    
Net income per common share, Basic (in dollars per share) $ 4.01 $ 1.30
Net income per common share, Diluted (in dollars per share) $ 3.97 $ 1.30
Numerator:    
Net income $ 201 $ 65
Effect of Dilutive Convertible Senior Notes 2 0
Net income corresponding to common stock, Basic 201 65
Net income corresponding to common stock, Diluted $ 203 $ 65
Denominator:    
Weighted average of outstanding common shares, Basic (in shares) 50,245,073 50,408,754
Weighted average of outstanding common shares, Diluted (in shares) 51,235,341 50,408,754
Adjustment for assumed conversions, Diluted (in shares) 990,268 0