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]      
Investments in affiliates, accounted for using the equity method $ 798us-gaap_EquityMethodInvestments $ 851us-gaap_EquityMethodInvestments  
Charter Communications      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership     27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Live Nation      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
   
Equity Method Investment, Quoted Market Value 1,356us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
   
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
 
Sirius XM Canada      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 37.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
   
Equity Method Investment, Quoted Market Value 206us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
   
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
 
Equity method investment, other      
Schedule of Equity Method Investments [Line Items]      
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