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Summary of Significant Accounting Policies - Argentina Operations (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Argentina |  |
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items] |  |
Percentage of subsidiary net sales to Mattel's consolidated net sales (less than) | 1.00% | 1.00%

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- Definition Maximum subsidiary net sales as a percentage of consolidated net sales. + References No definition available. + Details
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Namespace Prefix: | mat_
Data Type: | num:percentItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_AR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |