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Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.1.9
Investments In Affiliates Accounted For Using The Equity Method (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
May 31, 2013
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Investments in affiliates, accounted for using the equity method $ 798us-gaap_EquityMethodInvestments $ 851us-gaap_EquityMethodInvestments Ìý
Charter Communications Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Percentage ownership Ìý Ìý 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Live Nation Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Percentage ownership 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý
Equity Method Investment, Quoted Market Value 1,356us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý
Investments in affiliates, accounted for using the equity method 365us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		396us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý
Sirius XM Canada Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Percentage ownership 37.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý Ìý
Equity Method Investment, Quoted Market Value 206us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý Ìý
Investments in affiliates, accounted for using the equity method 227us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		237us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý
Equity method investment, other Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Investments in affiliates, accounted for using the equity method $ 206us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		$ 218us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		Ìý