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NET INCOME PER SHARE - Summary of Net Income per Share of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
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, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income attributable to MercadoLibre, Inc. per common share                              
Net income per common share, Basic (in dollars per share) $ 3.26 $ 7.18 $ 5.22 $ 4.01 $ 3.28 $ 2.57 $ 2.43 $ 1.30 $ (0.92) $ 1.92 $ 1.37 $ (0.68) $ 19.64 $ 9.57 $ 1.67
Net income per common share, Diluted (in dollars per share) $ 3.25 $ 7.16 $ 5.16 $ 3.97 $ 3.25 $ 2.56 $ 2.43 $ 1.30 $ (0.92) $ 1.92 $ 1.37 $ (0.68) $ 19.46 $ 9.53 $ 1.67
Numerator:                              
Net income $ 165 $ 359 $ 262 $ 201 $ 165 $ 129 $ 123 $ 65 $ (46) $ 95 $ 68 $ (34) $ 987 $ 482 $ 83
Effect of dilutive 2028 Notes                         6 7 0
Net income available to common stock, Basic                         987 482 83
Net income available to common stock, Diluted                         $ 993 $ 489 $ 83
Denominator:                              
Weighted average of common stock outstanding for earnings per share, Basic (in shares) 50,631,669 50,008,320 50,162,687 50,245,073 50,284,640 50,325,075 50,364,529 50,408,754 49,926,533 49,597,157 49,822,272 49,867,625 50,262,302 50,345,353 49,802,993
Adjustment for assumed conversions (in shares)                         744,558 990,268 0
Adjusted weighted average of common stock outstanding for earnings per share, Diluted (in shares) 50,697,515 50,209,439 51,152,955 51,235,341 51,274,909 51,315,343 50,364,529 50,408,754 49,926,533 49,597,157 49,822,272 49,867,625 51,006,860 51,335,621 49,802,993