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v3.26.1

Information About Liberty's Operating Segments (Details) | 6 Months Ended
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Jun. 30, 2026
Information About Liberty's Operating Segments |
Number Of Reportable Segments Not Disclosed Flag | false
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 Number of reportable segments not disclosed flag by the entity. + References No definition available. + Details
Name: | lmca_NumberOfReportableSegmentsNotDisclosedFlag
Namespace Prefix: | lmca_
Data Type: | xbrli:booleanItemType
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: |