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Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Details 1)

v2.4.1.9
Assets And Liabilities Measured At Fair Value (Details 1) (USD $)
 3 Months Ended 7 Months Ended 13 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Sep. 30, 2015
Oct. 17, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ (28,000,000)us-gaap_UnrealizedGainLossOnSecurities $ (65,000,000)us-gaap_UnrealizedGainLossOnSecurities Ìý Ìý Ìý
1.375% Cash Convertible Senior Notes due 2023 Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Debt face amount Ìý Ìý Ìý Ìý 1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
1.375% Cash Convertible Senior Notes due 2023 | Level 2 Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Debt face amount Ìý Ìý Ìý Ìý 1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value Option Securities Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net (31,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember 		(15,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember 		Ìý Ìý Ìý
Convertible Notes Payable Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net Ìý 59,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConvertibleNotesPayableMember 		Ìý Ìý Ìý
1.375% Convertible Notes Bond Hedge Transaction Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net 8,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember 		(92,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_A1.375ConvertibleNotesBondHedgeTransactionMember 		Ìý Ìý Ìý
Other Financial Instruments Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ (5,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember 		$ (17,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember 		Ìý Ìý Ìý
Forward Contracts | Live Nation Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Maximum shares to be purchased Ìý Ìý Ìý 15,900,000lmca_ForwardContractMaximumSharesToBePurchased
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý
Counterparty shares acquired Ìý Ìý 11,000,000lmca_ForwardContractCounterpartySharesAcquired
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý
Weighted average stock price shares purchased by counterparty Ìý Ìý 23.69lmca_ForwardContractCounterpartySharesAcquiredWeightedAverageSharePrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý