Contingencies	6 Months Ended
Contingencies	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Litigation Related to Yellowstone do Brasil Ltda. In April 1999, Yellowstone do Brasil Ltda. (formerly known as Trebbor Informática Ltda.) filed a lawsuit against Mattel do Brasil before the 15th Civil Court of Curitiba, State of Parana, requesting the annulment of its security bonds and promissory notes given to Mattel do Brasil as well as damages due to an alleged breach of an oral exclusive distribution agreement between the parties relating to the supply and sale of toys in Brazil. Yellowstone's complaints sought alleged loss of profits plus an unspecified amount of damages. Mattel do Brasil filed its defenses to these claims and simultaneously presented a counterclaim for unpaid accounts receivable for goods supplied to Yellowstone. In April 2018, Mattel do Brasil entered into a settlement agreement to resolve this matter, but the settlement was later rejected by the courts, subject to a pending appeal by Mattel. In October 2018, the Superior Court of Justice issued a final ruling in favor of Yellowstone on the merits of Yellowstone's claims. Previously, the courts had ruled in Mattel's favor on its counterclaim. In October 2019, Mattel reached an agreement with Yellowstone's former counsel regarding payment of the attorney's fees portion of the judgment. In November 2019, Yellowstone initiated an action to enforce its judgment against Mattel, but did not account for an offset for Mattel's counterclaim. In January 2020, Mattel obtained an injunction, staying Yellowstone's enforcement action pending resolution of Mattel's appeal to enforce the parties' April 2018 settlement. As of June 30, 2023, Mattel assessed its probable loss related to this matter and has accrued a reserve, which is not material. Litigation Related to the Fisher-Price Rock 'n Play Sleeper A number of putative class action lawsuits filed between April 2019 and October 2019 are pending against Fisher-Price, Inc. and/or Mattel, Inc. asserting claims for false advertising, negligent product design, breach of warranty, fraud, and other claims in connection with the marketing and sale of the Fisher-Price Rock 'n Play Sleeper (the "Sleeper"). In general, the lawsuits allege that the Sleeper should not have been marketed and sold as safe and fit for prolonged and overnight sleep for infants. The putative class action lawsuits propose nationwide and over 10 statewide consumer classes comprised of those who purchased the Sleeper as marketed as safe for prolonged and overnight sleep. The class actions have been consolidated before a single judge in the United States District Court for the Western District of New York for pre-trial purposes pursuant to the U.S. federal courts' Multi-District Litigation program. In June 2022, the court denied the plaintiffs' motion to certify damages and injunctive relief classes under New York law, but granted plaintiffs' request to certify a New York issue class to resolve two issues on a class-wide basis. In October 2022, the United States Court of Appeals for the Second Circuit denied plaintiffs' petition to appeal the denial of certification of the damages and injunctive relief classes. Thirty additional lawsuits filed between April 2019 and April 2023 are pending against Fisher-Price, Inc. and Mattel, Inc. alleging that a product defect in the Sleeper caused the fatalities of or injuries to thirty-four children. Several lawsuits have been settled and/or dismissed. Additionally, Fisher-Price, Inc. and/or Mattel, Inc. have also received letters from lawyers purporting to represent additional plaintiffs who have threatened to assert similar claims. In addition, a stockholder has filed a derivative action in the Court of Chancery for the State of Delaware (Kumar v. Bradley, et al., filed July 7, 2020) alleging breach of fiduciary duty and unjust enrichment related to the development, marketing, and sale of the Sleeper. The defendants in the derivative action are certain of Mattel's current and former officers and directors. In August 2020, the derivative action was stayed pending further developments in the class action lawsuits. In August 2021, a second similar derivative action was filed in the Court of Chancery for the State of Delaware (Armon v. Bradley, et al., filed August 30, 2021), which is also stayed. The lawsuits seek compensatory damages, punitive damages, statutory damages, restitution, disgorgement, attorneys' fees, costs, interest, declaratory relief, and/or injunctive relief. Mattel believes that the allegations in the lawsuits are without merit and intends to vigorously defend against them. A reasonable estimate of the amount of any possible loss or range of loss for the lawsuits cannot be made at this time. Mattel also is in discussions with the US Consumer Product Safety Commission ("CPSC") regarding a request from the CPSC that Mattel increase the proportional cash refund available to consumers who participate in the recall of the Sleeper first announced in 2019. As of June 30, 2023, Mattel assessed its probable loss related to this matter and has accrued a reserve, which is not material.