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Information About Liberty's Operating Segments (Details)	6 Months Ended
	Jun. 30, 2025
Formula 1
Information About Liberty's Operating Segments
Duration of World Championship	9 months

X

- Definition

The length of time of the Motor race based World Championship competition.

+ References

No definition available.

+ Details

Name:	lmca_LengthOfWorldChampionshipMotorRaceBasedCompetition
Namespace Prefix:	lmca_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lmca_FormulaOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: