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Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliates Accounted for Using the Equity Method (Details 2)

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Investments in Affiliates Accounted for Using the Equity Method (Details 2) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 31, 2013
Schedule of Equity Method Investments [Line Items]
Gain (loss) on dilution of investment in affiliate $ (1,000,000)lmca_Gainlossondilutionofinvestmentinaffiliate $ (50,000,000)lmca_Gainlossondilutionofinvestmentinaffiliate
Live Nation
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember
SIRIUS XM
Schedule of Equity Method Investments [Line Items]
Due to Related Parties, Current 5,000,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
Due to Related Parties, Noncurrent 13,000,000us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
Due from Related Parties, Current 3,000,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
Revenue from Related Parties 14,000,000us-gaap_RevenueFromRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
12,000,000us-gaap_RevenueFromRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
Sirius XM Canada
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage 37.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
Dividends 4,000,000us-gaap_Dividends
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
4,000,000us-gaap_Dividends
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember
Charter Communications
Schedule of Equity Method Investments [Line Items]
Purchase of shares in equity method investee 26.9lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Warrants acquired 1.1lmca_WarrantsAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Equity Method Investment, Aggregate Cost 2,600,000,000us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Equity Method Investment, Ownership Percentage 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Price-per-share $ 95.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Gain (loss) on dilution of investment in affiliate $ (46,000,000)lmca_Gainlossondilutionofinvestmentinaffiliate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember