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Assets And Liabilities Measured At Fair Value (Details 1) (USD $)
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3 Months Ended |
7 Months Ended |
13 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2015
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Sep. 30, 2015
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Oct. 17, 2013
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Realized and unrealized gains (losses) on financial instruments, net |
$ (28,000,000)us-gaap_UnrealizedGainLossOnSecurities
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$ (65,000,000)us-gaap_UnrealizedGainLossOnSecurities
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| 1.375% Cash Convertible Senior Notes due 2023 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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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| 1.375% Cash Convertible Senior Notes due 2023 | Level 2 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
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| Fair Value Option Securities |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Realized and unrealized gains (losses) on financial instruments, net |
(31,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember
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(15,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember
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| Convertible Notes Payable |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Realized and unrealized gains (losses) on financial instruments, net |
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59,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConvertibleNotesPayableMember
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| 1.375% Convertible Notes Bond Hedge Transaction |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Realized and unrealized gains (losses) on financial instruments, net |
8,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
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(92,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember
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| Other Financial Instruments |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Realized and unrealized gains (losses) on financial instruments, net |
$ (5,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember
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$ (17,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember
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| Forward Contracts | Live Nation |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Maximum shares to be purchased |
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15,900,000lmca_ForwardContractMaximumSharesToBePurchased
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
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| Counterparty shares acquired |
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11,000,000lmca_ForwardContractCounterpartySharesAcquired
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
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| Weighted average stock price shares purchased by counterparty |
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23.69lmca_ForwardContractCounterpartySharesAcquiredWeightedAverageSharePrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
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