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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