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Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v2.4.1.9
Basis of Presentation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Oct. 31, 2014
Mar. 31, 2015
Jul. 23, 2014
Mar. 31, 2014
Entity Information [Line Items] Ìý Ìý Ìý Ìý
Additional paid in capital deficit reclassification Ìý $ 64lmca_AdjustmentToAdditionalPaidInCapitalDeficitReclassification Ìý Ìý
Cash received from consolidated subsidiary 300lmca_CashReceivedFromConsolidatedSubsidiary Ìý Ìý Ìý
Common Class A Ìý Ìý Ìý Ìý
Entity Information [Line Items] Ìý Ìý Ìý Ìý
Number of shares issued during the period for each share of Series A and Series B stock held by shareholders prior to the distribution Ìý Ìý 2lmca_NumberofsharesissuedduringtheperiodforeachshareofSeriesAandSeriesBstockheldbyshareholderspriortothedistribution
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		Ìý
Common Class C Ìý Ìý Ìý Ìý
Entity Information [Line Items] Ìý Ìý Ìý Ìý
Number of shares issued during the period for each share of Series A and Series B stock held by shareholders prior to the distribution Ìý Ìý 2lmca_NumberofsharesissuedduringtheperiodforeachshareofSeriesAandSeriesBstockheldbyshareholderspriortothedistribution
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		Ìý
Liberty Broadband Ìý Ìý Ìý Ìý
Entity Information [Line Items] Ìý Ìý Ìý Ìý
Common Stock, Shares Subscribed but Unissued Ìý 1us-gaap_CommonStockSharesSubscribedButUnissued
/ dei_LegalEntityAxis
= lmca_LibertyBroadbandMember 		Ìý Ìý
Number of shares received in spin-off Ìý 0.25lmca_Numberofsharesreceivedinspinoff
/ dei_LegalEntityAxis
= lmca_LibertyBroadbandMember 		Ìý Ìý
Liberty Interactive Corporation Starz Tripco Liberty Broadband [Member] Ìý Ìý Ìý Ìý
Entity Information [Line Items] Ìý Ìý Ìý Ìý
Related Party Transaction, Amounts of Transaction Ìý 3us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ dei_LegalEntityAxis
= lmca_LibertyInteractiveCorporationStarzTripcoLibertyBroadbandMember 		Ìý 2us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ dei_LegalEntityAxis
= lmca_LibertyInteractiveCorporationStarzTripcoLibertyBroadbandMember
Starz, LLC | Lease Agreements Ìý Ìý Ìý Ìý
Entity Information [Line Items] Ìý Ìý Ìý Ìý
Related Party Transaction, Amounts of Transaction Ìý $ 3us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ dei_LegalEntityAxis
= lmca_StarzLlcMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_LeaseAgreementsMember 		Ìý Ìý