Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying unaudited consolidated financial statements and related disclosures have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") applicable to interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. In the opinion of management, all adjustments, consisting of only those of a normal recurring nature, considered necessary for a fair statement of the financial position and interim results of Mattel, Inc. and its subsidiaries ("Mattel") as of and for the periods presented have been included.
Accounting Pronouncements Recently Adopted	Accounting Pronouncements Recently Adopted In September 2022, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") 2022-04, Liabilities—Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations. ASU 2022-04 requires that buyers in a supplier finance program disclose sufficient information about the program to allow a user of the financial statements to understand the program's nature, activity during the period, changes since prior periods, and potential magnitude. The guidance in ASU 2022-04 was effective for interim and fiscal years beginning after December 15, 2022. Refer to "Note 7 to the Consolidated Financial Statements—Supplier Finance Program" for additional information regarding Mattel's supplier finance program. The adoption of this new accounting standard did not have a material impact on Mattel's consolidated financial statements.

MATTEL INC /DE/ 10-Q