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Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Details)

v2.4.1.9
Commitments And Contingencies (Details)
 3 Months Ended 12 Months Ended 46 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2011
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2002
USD ($)
Sep. 30, 2012
USD ($)
Dec. 31, 2005
USD ($)
Dec. 31, 2014
SIRIUS XM
USD ($)
Jun. 25, 2012
Pending Litigation
Vivendi Universal SA Suit [Member]
EUR (€)
Sep. 30, 2013
Pending Litigation
Use And Pulic Performance Of Sounds Recorded Prior to February 15, 1972 Lawsuit
SIRIUS XM
USD ($)
lawsuit
Dec. 31, 2014
Pending Litigation
Telephone Consumer Protection Act Of 1991 Lawsuit [Member]
USD ($)
lawsuit
Jan. 17, 2013
Including prejudgement interest [Member]
Pending Litigation
Vivendi Universal SA Suit [Member]
EUR (€)
Dec. 31, 2014
ANLBC
USD ($)
Aug. 31, 2013
Minimum
Pending Litigation
SoundExchange Inc lawsuit
SIRIUS XM
USD ($)
Aug. 31, 2013
Maximum
Pending Litigation
SoundExchange Inc lawsuit
SIRIUS XM
USD ($)
Dec. 31, 2014
Maximum
Pending Litigation
Telephone Consumer Protection Act Of 1991 Lawsuit [Member]
USD ($)
Loss Contingencies [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Gain Contingency, Unrecorded Amount Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý € 765,000,000us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_LitigationCaseAxis
= lmca_VivendiUniversalSaLawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		Ìý Ìý € 945,000,000us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_GainContingenciesByNatureAxis
= lmca_IncludingPrejudgementInterestMember
/ us-gaap_LitigationCaseAxis
= lmca_VivendiUniversalSaLawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		Ìý Ìý Ìý Ìý
Loss Contingency, Estimate of Possible Loss Ìý Ìý Ìý Ìý Ìý 128,000,000us-gaap_LossContingencyEstimateOfPossibleLoss 70,000,000us-gaap_LossContingencyEstimateOfPossibleLoss Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Number of class action suits Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 3lmca_NumberOfClassActionsSuitsFiled
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_LitigationCaseAxis
= lmca_UseAndPulicPerformanceOfSoundsRecordedPriorToFebruary151972LawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		3lmca_NumberOfClassActionsSuitsFiled
/ us-gaap_LitigationCaseAxis
= lmca_TelephoneConsumerProtectionActOf1991LawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		Ìý Ìý Ìý Ìý Ìý
Number of suits filed Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 1us-gaap_LossContingencyPendingClaimsNumber
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_LitigationCaseAxis
= lmca_UseAndPulicPerformanceOfSoundsRecordedPriorToFebruary151972LawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		Ìý Ìý Ìý Ìý Ìý Ìý
Damages sought Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 100,000,000us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_LitigationCaseAxis
= lmca_UseAndPulicPerformanceOfSoundsRecordedPriorToFebruary151972LawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		Ìý Ìý Ìý 50,000,000us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_LitigationCaseAxis
= lmca_SoundexchangeIncLawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		100,000,000us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_LitigationCaseAxis
= lmca_SoundexchangeIncLawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		Ìý
Saturtory damages per violation sought Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 500lmca_LossContingencyStatutoryDamagesSoughtPerViolation
/ us-gaap_LitigationCaseAxis
= lmca_TelephoneConsumerProtectionActOf1991LawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		Ìý Ìý Ìý Ìý Ìý
Treble damages sought per knowing violation Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 1,500lmca_LossContingencyTrebleDamagesSoughtForEachKnowingViolation
/ us-gaap_LitigationCaseAxis
= lmca_TelephoneConsumerProtectionActOf1991LawsuitMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Estimate of amounts payable for rights to future programming Ìý Ìý Ìý Ìý Ìý Ìý Ìý 231,000,000lmca_EstimatedAmountsPayableForFutureProgrammingOneYearAfterBalanceSheetDate
/ dei_LegalEntityAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Estimate of amounts payable for rights to future programming, 2013 Ìý Ìý Ìý Ìý Ìý Ìý Ìý 110,000,000lmca_EstimatedAmountsPayableForFutureProgrammingTwoYearsAfterBalanceSheetDate
/ dei_LegalEntityAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Estimate of amounts payable for rights to future programming, 2014 Ìý Ìý Ìý Ìý Ìý Ìý Ìý 75,000,000lmca_EstimatedAmountsPayableForFutureProgrammingThreeYearsAfterBalanceSheetDate
/ dei_LegalEntityAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Estimate of amounts payable for rights to future programming, 2015 Ìý Ìý Ìý Ìý Ìý Ìý Ìý 60,000,000lmca_EstimatedAmountsPayableForFutureProgrammingFourYearsAfterBalanceSheetDate
/ dei_LegalEntityAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Estimated Amounts Payable for Future Programming Five Years After Balance Sheet Date Ìý Ìý Ìý Ìý Ìý Ìý Ìý 48,000,000lmca_EstimatedAmountsPayableForFutureProgrammingFiveYearsAfterBalanceSheetDate
/ dei_LegalEntityAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Compensation guarantee aggregate total Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 398,000,000lmca_CompensationGuaranteeAggregateTotal
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Amounts payable under guarantee in 2015 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 80,000,000lmca_GuaranteedEmploymentContractDueInOneYear
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Amounts payable under guarantee in 2016 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 72,000,000lmca_GuranteedEmploymentContractDueInTwoYears
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Amounts payable under guarantee in 2017 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 88,000,000lmca_GuaranteedEmploymentContractDueInThreeYears
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Amounts payable under guarantee in 2018 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 54,000,000lmca_GuaranteedEmploymentContractDueInFourYears
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Amount payable under guarantee, thereafter Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 104,000,000lmca_AmountsPayableUnderGuaranteeThereafter
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Operating Leases, Future Minimum Payments Due [Abstract] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Rent Expense Ìý 52,000,000us-gaap_LeaseAndRentalExpense 48,000,000us-gaap_LeaseAndRentalExpense 9,000,000us-gaap_LeaseAndRentalExpense Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Future Minimum Payments Due, Current Ìý 53,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Future Minimum Payments, Due in Two Years Ìý 47,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Future Minimum Payments, Due in Three Years Ìý 44,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Future Minimum Payments, Due in Four Years Ìý 41,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Future Minimum Payments, Due in Five Years Ìý 36,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Operating Leases, Future Minimum Payments, Due Thereafter Ìý 380,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Proceeds from Contributions from Parent Ìý Ìý Ìý Ìý 670,000,000us-gaap_ProceedsFromContributionsFromParent Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Adjustments to Additional Paid in Capital, Tax Benefit From Transactions with former Parent $ 72,000,000lmca_AdjustmentsToAdditionalPaidInCapitalTaxBenefitFromTransactionsWithFormerParent Ìý Ìý $ 72,000,000lmca_AdjustmentsToAdditionalPaidInCapitalTaxBenefitFromTransactionsWithFormerParent Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý