Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 2)

v2.4.1.9
Debt (Details 2) ($1 billion margin loan due 2014, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
SIRIUS XM  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 150.0lmca_Sharespledgedascollateralunderloan
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_SiriusXmMember
Share value $ 573us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_SiriusXmMember
Live Nation  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 12.0lmca_Sharespledgedascollateralunderloan
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_LiveNationMember
Share value 303us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_LiveNationMember
Time Warner Inc  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 3.6lmca_Sharespledgedascollateralunderloan
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_TimeWarnerIncMember
Share value 306us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_TimeWarnerIncMember
Time, Inc. [Member]  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 0.5lmca_Sharespledgedascollateralunderloan
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_TimeInc.Member
Share value $ 12us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_A1billionmarginloandue2014Member
/ invest_InvestmentIssuerAxis
= lmca_TimeInc.Member