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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

Name:	meli_AssetsUnderAdministrationOfThirdPartyRelatedToMutualFunds
Namespace Prefix:	meli_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt Security, Maximum Principal Amount Permitted To Be Outstanding

+ References

No definition available.

+ Details

Name:	meli_DebtSecurityMaximumPrincipalAmountPermittedToBeOutstanding
Namespace Prefix:	meli_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- Details

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