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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Crypto Asset Activity (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Crypto Asset [Roll Forward] |  |
Balance at beginning of year |  | $ 9
Gains included in net income | $ 14 |
Balance at end of year | $ 24 | 0
Cumulative Effect, Period of Adoption, Adjustment |  |
Crypto Asset [Roll Forward] |  |
Balance at end of year |  | $ 1

X
- Definition Crypto Asset, Fair Value + References No definition available. + Details
Name: | meli_CryptoAssetFairValue
Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Crypto Asset, Net + References No definition available. + Details
Name: | meli_CryptoAssetNet
Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Crypto Asset, Realized and Unrealized Gain (Loss), Operating + References No definition available. + Details
Name: | meli_CryptoAssetRealizedAndUnrealizedGainLossOperating
Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Crypto Asset + References No definition available. + Details
Name: | meli_CryptoAssetRollForward
Namespace Prefix: | meli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |