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Summary of Significant Accounting Policies - Remeasurement (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) VEF / $ | Dec. 31, 2016 USD ($) | Feb. 28, 2013 VEF / $ | Dec. 31, 2012 VEF / $
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items] |  |  |  |
Net monetary assets denominated in Venezuelan bolivar fuerte | $ |  | $ 1 |  |
Pre tax charge on cessation of Venezuelan subsidiary | $ |  | $ 71 |  |
VENEZUELA |  |  |  |
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 |  | 0.01% |  |
UNITED KINGDOM |  |  |  |
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 |  | 4.00% |  |
Pro Forma |  |  |  |
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items] |  |  |  |
Exchange rate for translation (in VEF) | VEF / $ |  |  |  | 5.30
Pro Forma 2 |  |  |  |
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items] |  |  |  |
Exchange rate for translation (in VEF) | VEF / $ |  |  | 6.30 |
Pro Forma 3 |  |  |  |
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items] |  |  |  |
Exchange rate for translation (in VEF) | VEF / $ | 10.00 |  |  |
Venezuelan bolívar fuerte |  |  |  |
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items] |  |  |  |
Foreign currency transaction loss, unrealized | $ | $ 26 |  |  |

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