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Debt (Details 3) (USD $)
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3 Months Ended |
0 Months Ended |
1 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Apr. 30, 2013
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Oct. 31, 2014
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Dec. 31, 2014
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Oct. 17, 2013
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Dec. 31, 2012
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| Debt Instrument [Line Items] |
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| Long-term Debt |
$ 6,471,000,000us-gaap_LongTermDebt
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$ 5,852,000,000us-gaap_LongTermDebt
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| Borrowings of debt |
1,275,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
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| Repayments of Long-term Debt |
658,000,000us-gaap_RepaymentsOfLongTermDebt
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821,000,000us-gaap_RepaymentsOfLongTermDebt
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| Sirius XM credit facility |
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| Debt Instrument [Line Items] |
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| Long-term Debt |
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380,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= lmca_SiriusXmCreditFacilityMember
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| Debt instrument, unused borrowing capacity, fee, percent |
0.30%lmca_DebtInstrumentUnusedBorrowingCapacityFeePercent
/ us-gaap_LongtermDebtTypeAxis
= lmca_SiriusXmCreditFacilityMember
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| Line of Credit Facility, Remaining Borrowing Capacity |
1,250,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lmca_SiriusXmCreditFacilityMember
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| Debt Instrument, Term |
5 years
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| Line of Credit Facility, Maximum Borrowing Capacity |
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1,250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lmca_SiriusXmCreditFacilityMember
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| 1.375% Cash Convertible Senior Notes due 2023 |
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| Debt Instrument [Line Items] |
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| Debt face amount |
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1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| Debt Instrument, Interest Rate, Stated Percentage |
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1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| Debt instrument, face amount per debenture |
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1,000lmca_DebtInstrumentFaceAmountPerDebenture
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| Debt Instrument, Convertible, Threshold Trading Days |
20us-gaap_DebtInstrumentConvertibleThresholdTradingDays
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| Debt Instrument, Convertible, Threshold Consecutive Trading Days |
30 days
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| Debt instrument, convertible, threshold percentage of conversion price to stock price trigger |
98.00%lmca_Debtinstrumentconvertiblethresholdpercentageofconversionpricetostockpricetrigger
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| Number of business days in measurement period |
5lmca_DebtInstrumentConvertibleMeasurementPeriodBusinessDays
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| Number of consecutive trading days in measurement period. |
5 days
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| Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |
130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
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| $1 billion margin loan due 2014 |
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| Debt Instrument [Line Items] |
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| Interest rate at year end |
2.03%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
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| $1 billion margin loan due 2014 | Term loan |
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| Debt Instrument [Line Items] |
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| Debt face amount |
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250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= lmca_TermloanMember
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| Borrowings of debt |
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250,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= lmca_TermloanMember
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| Debt Instrument, Description of Variable Rate Basis |
LIBOR
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| Debt Instrument, Basis Spread on Variable Rate |
2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= lmca_TermloanMember
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| $1 billion margin loan due 2014 | Revolving Credit Facility |
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| Debt Instrument [Line Items] |
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| Debt face amount |
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750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Borrowings of debt |
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450,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Debt Instrument, Description of Variable Rate Basis |
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LIBOR
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| Debt instrument, basis spread on variable rate, floor |
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1.75%lmca_DebtInstrumentBasisSpreadOnVariableRateFloor
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Debt instrument, basis spread on variable rate, cap |
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2.50%lmca_DebtInstrumentBasisSpreadOnVariableRateCap
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Debt instrument, unused borrowing capacity, fee, percent |
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0.75%lmca_DebtInstrumentUnusedBorrowingCapacityFeePercent
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Line of Credit Facility, Remaining Borrowing Capacity |
750,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Incremental borrowing capacity |
1,000,000,000lmca_IncrementalBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Sirius Xm 5.375 Senior Notes Due 2025 |
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| Debt Instrument [Line Items] |
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| Debt face amount |
1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXm5.375SeniorNotesDue2025Member
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| Debt discount |
11,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXm5.375SeniorNotesDue2025Member
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| Debt Instrument, Interest Rate, Stated Percentage |
5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXm5.375SeniorNotesDue2025Member
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| Common Class A | 1.375% Cash Convertible Senior Notes due 2023 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Convertible, Conversion Ratio |
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21.0859us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
/ lmca_UnderlyingSharesAxis
= us-gaap_CommonClassAMember
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5.5882us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
/ lmca_UnderlyingSharesAxis
= us-gaap_CommonClassAMember
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| conversion price for exchangeable debt |
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$ 47.43us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
/ lmca_UnderlyingSharesAxis
= us-gaap_CommonClassAMember
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$ 178.95us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
/ lmca_UnderlyingSharesAxis
= us-gaap_CommonClassAMember
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| 1.375% Convertible Notes Bond Hedge Transaction |
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| Debt Instrument [Line Items] |
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| Forward contract, number of underlying shares |
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21,085,900lmca_Forwardcontractnumberofunderlyingshares
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
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| Derivative, Cap Price |
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47.43us-gaap_DerivativeCapPrice
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
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178.95us-gaap_DerivativeCapPrice
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
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| Payments for Derivative Instrument, Investing Activities |
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$ 299,000,000us-gaap_PaymentsForDerivativeInstrumentInvestingActivities
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
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| 1.375% Convertible Notes Bond Hedge Transaction | Common Class A |
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| Debt Instrument [Line Items] |
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| Forward contract, number of underlying shares |
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5,588,200lmca_Forwardcontractnumberofunderlyingshares
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
/ lmca_UnderlyingSharesAxis
= us-gaap_CommonClassAMember
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