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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 9 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Net income attributable to MercadoLibre, Inc. per common share                    
Net income per common share, Basic (in dollars per share) $ 10.48       $ 5.22   $ 17.26 $ 9.23    
Net income per common share, Diluted (in dollars per share) $ 10.48       $ 5.16   $ 17.26 $ 9.12    
Numerator:                    
Net income $ 531 $ 344 $ 165 $ 359 $ 262 [1] $ 201 $ 875 $ 463 [1] $ 822 $ 987
Effect of dilutive 2028 Notes 0       2   0 4    
Net income available to common stock, Basic 531       262   875 463    
Net income available to common stock, Diluted $ 531       $ 264   $ 875 $ 467    
Denominator:                    
Weighted average of common stock outstanding for earnings per share, Basic (in shares) 50,697,447       50,162,687   50,697,444 50,203,652    
Adjustment for assumed conversions, Diluted (in shares) 0       990,268   0 990,268    
Adjusted weighted average of common stock outstanding for earnings per share, Diluted (in shares) 50,697,447       51,152,955   50,697,444 51,193,920    
[1] Recast for consistency with the current presentation due to the change in the presentation of certain financial results. Please refer to Note 2 – Summary of significant accounting policies - Change in the presentation of certain financial results and reclassification of prior year results.