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Cover - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 07, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-05647    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-1567322    
Entity Address, Address Line One 333 Continental Blvd.    
Entity Address, City or Town El Segundo    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90245-5012    
City Area Code 310    
Local Phone Number 252-2000    
Title of 12(b) Security Common stock, $1.00 per share    
Trading Symbol MAT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 5,044,446
Entity Common Stock, Shares Outstanding   346,870,826  
Documents Incorporated by Reference
Portions of the Mattel, Inc. 2020 Proxy Statement, filed with the Securities and Exchange Commission (“SEC”) within 120 days after the closing of the registrant's fiscal year (incorporated into Part III to the extent stated herein).
    
Amendment Flag true    
Amendment Description This Amendment No. 1 (“Amendment No. 1”) to the Annual Report on Form 10-K of Mattel, Inc. (the "Company") for the year ended December 31, 2019, as filed with the Securities and Exchange Commission on February 25, 2020 (the "Original Form 10-K"), is being filed for the sole purpose of replacing the consent in Exhibit 23.0 due to an administrative error that resulted in an improperly worded auditor's consent. A new Exhibit 23.0 with the appropriate corrections is filed as Exhibit 23.1 attached hereto.   Except as otherwise expressly noted herein, this Amendment No. 1 does not modify or update in any way the financial position, results of operations, cash flows, or other disclosure in, or exhibits to, the Original Form 10-K, nor does it reflect events occurring after the filing of the Original Form 10-K. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Form 10-K.      
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name MATTEL INC /DE/    
Entity Central Index Key 0000063276    
Current Fiscal Year End Date --12-31