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Leases - Narrative (Details) $ in Millions	Dec. 31, 2024 USD ($)
Leases [Abstract]
Lease not yet commenced, future minimum obligation	$ 2.3

X

- Definition

Lessee, Operating Lease, Not Yet Commenced, Future Minimum Obligation

+ References

No definition available.

+ Details

Name:	mat_LesseeOperatingLeaseNotYetCommencedFutureMinimumObligation
Namespace Prefix:	mat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration