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Quarterly report pursuant to Section 13 or 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Details 1)

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Investments In Affiliates Accounted For Using The Equity Method (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]
Share of earnings (losses) of affiliates, net $ (37)us-gaap_IncomeLossFromEquityMethodInvestments $ (35)us-gaap_IncomeLossFromEquityMethodInvestments
Excess basis amortization in share of earnings (loss) 19lmca_ExcessBasisAmortizationInShareOfEarningsLoss
Live Nation
Schedule of Equity Method Investments [Line Items]
Share of earnings (losses) of affiliates, net (18)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
(14)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
Sirius XM Canada
Schedule of Equity Method Investments [Line Items]
Share of earnings (losses) of affiliates, net (7)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
1us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
Charter Communications
Schedule of Equity Method Investments [Line Items]
Share of earnings (losses) of affiliates, net (28)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Equity method investment, other
Schedule of Equity Method Investments [Line Items]
Share of earnings (losses) of affiliates, net $ (12)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember
$ 6us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember