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Annual report pursuant to Section 13 and 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 $)
Share data in Millions, except Per Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 4 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Dec. 31, 2014
Oct. 17, 2013
Oct. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ 38,000,000us-gaap_UnrealizedGainLossOnSecurities $ 295,000,000us-gaap_UnrealizedGainLossOnSecurities $ 230,000,000us-gaap_UnrealizedGainLossOnSecurities Ìý Ìý Ìý Ìý
1.375% Cash Convertible Senior Notes due 2023 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Debt face amount Ìý Ìý Ìý Ìý Ìý 1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lmca_A1.375CashConvertibleSeniorNotesdue2023Member 		Ìý
1.375% Cash Convertible Senior Notes due 2023 | Level 2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Debt face amount Ìý Ìý 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 Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net 80,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember 		306,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember 		310,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FinancialInstrumentAxis
= lmca_FairValueOptionSecuritiesMember 		Ìý Ìý Ìý Ìý
Convertible Notes Payable | Level 2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net 12,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConvertibleNotesPayableMember 		(17,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConvertibleNotesPayableMember 		Ìý Ìý Ìý Ìý Ìý
Bond Hedge Change in Fair Value | Level 2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net (89,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= lmca_BondHedgeChangeInFairValueMember 		(1,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= lmca_BondHedgeChangeInFairValueMember 		Ìý Ìý Ìý Ìý Ìý
Other Financial Instruments | Level 2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ 35,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember 		$ 7,000,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember 		$ (80,000,000)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= lmca_OtherFinancialInstrumentsMember 		Ìý Ìý Ìý Ìý
Forward Contracts | Live Nation Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Maximum shares to be purchased Ìý Ìý Ìý 15.9lmca_ForwardContractMaximumSharesToBePurchased
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý
Counterparty shares acquired Ìý Ìý Ìý Ìý 8.6lmca_ForwardContractCounterpartySharesAcquired
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý
Weighted average stock price shares purchased by counterparty Ìý Ìý Ìý Ìý $ 23.40lmca_ForwardContractCounterpartySharesAcquiredWeightAverageSharePrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý