Annual report pursuant to Section 13 and 15(d)

Debt (Details 2)

v2.4.1.9
Debt (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
SIRIUS XM  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 150.0lmca_Sharespledgedascollateralunderloan
/ invest_InvestmentIssuerAxis
= lmca_SiriusXmMember
Share value $ 525us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ invest_InvestmentIssuerAxis
= lmca_SiriusXmMember
Live Nation  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 12.0lmca_Sharespledgedascollateralunderloan
/ invest_InvestmentIssuerAxis
= lmca_LiveNationMember
Share value 313us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ invest_InvestmentIssuerAxis
= lmca_LiveNationMember
Time Warner Inc  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 3.6lmca_Sharespledgedascollateralunderloan
/ invest_InvestmentIssuerAxis
= lmca_TimeWarnerIncMember
Share value 309us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ invest_InvestmentIssuerAxis
= lmca_TimeWarnerIncMember
Viacom, Inc.  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 3.5lmca_Sharespledgedascollateralunderloan
/ invest_InvestmentIssuerAxis
= lmca_ViacomIncMember
Share value 266us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ invest_InvestmentIssuerAxis
= lmca_ViacomIncMember
Time, Inc. [Member]  
Debt Instrument [Line Items]  
Shares pledged as collateral under loan 1.0lmca_Sharespledgedascollateralunderloan
/ invest_InvestmentIssuerAxis
= lmca_TimeInc.Member
Share value $ 13us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
/ invest_InvestmentIssuerAxis
= lmca_TimeInc.Member