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FINTECH REGULATIONS (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Apr. 30, 2025
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Debt securities permitted to be outstanding |  | $ 500
Subsidiaries |  |
Cash and Cash Equivalents [Line Items] |  |
Assets | $ 3,477 |

X
- Definition Assets Under Administration Of Third Party Related To Mutual Funds + References No definition available. + Details
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Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Debt Security, Maximum Principal Amount Permitted To Be Outstanding + References No definition available. + Details
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Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |