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Net Income (Loss) Per Share - Net Income Per Share Of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income attributable to MercadoLibre, Inc. per common share                              
Net loss per common share, Basic (in dollars per share) $ 3.28 $ 2.57 $ 2.43 $ 1.30 $ (0.92) $ 1.92 $ 1.37 $ (0.68) $ (1.02) $ 0.28 $ 1.11 $ (0.44) $ 9.57 $ 1.67 $ (0.08)
Net loss per common share, Diluted (in dollars per share) $ 3.25 $ 2.56 $ 2.43 $ 1.30 $ (0.92) $ 1.92 $ 1.37 $ (0.68) $ (1.02) $ 0.28 $ 1.11 $ (0.44) $ 9.53 $ 1.67 $ (0.08)
Numerator:                              
Net income (loss) $ 165 $ 129 $ 123 $ 65 $ (46) $ 95 $ 68 $ (34) $ (51) $ 15 $ 56 $ (21) $ 482 $ 83 $ (1)
Effect of dilutive Convertible Senior Notes                         7 0 0
Dividends on preferred stock                         0 0 (3)
Net income corresponding to common stock, Basic                         482 83 (4)
Net income corresponding to common stock, Diluted                         $ 489 $ 83 $ (4)
Denominator:                              
Weighted average of common stock outstanding for Basic earnings per share (in shares) 50,284,640 50,325,075 50,364,529 50,408,754 49,926,533 49,597,157 49,822,272 49,867,625 49,820,185 49,720,854 49,709,973 49,709,955 50,345,353 49,802,993 49,740,407
Adjustment for assumed conversions (in shares)                         990,268    
Adjusted weighted average of common stock outstanding for Diluted earnings per share (in shares) 51,274,909 51,315,343 50,364,529 50,408,754 49,926,533 49,597,157 49,822,272 49,867,625 49,820,185 49,720,854 49,709,973 49,709,955 51,335,621 49,802,993 49,740,407