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Annual report pursuant to Section 13 and 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 $)
Share data in Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2013
Jan. 18, 2013
Mar. 31, 2013
May 01, 2013
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Investments in affiliates, accounted for using the equity method $ 851,000,000us-gaap_EquityMethodInvestments $ 3,299,000,000us-gaap_EquityMethodInvestments Ìý Ìý Ìý Ìý Ìý
Share of earnings (losses) of affiliates, net (113,000,000)us-gaap_IncomeLossFromEquityMethodInvestments (32,000,000)us-gaap_IncomeLossFromEquityMethodInvestments 1,346,000,000us-gaap_IncomeLossFromEquityMethodInvestments Ìý Ìý Ìý Ìý
Income Tax Expense (Benefit) 66,000,000us-gaap_IncomeTaxExpenseBenefit (135,000,000)us-gaap_IncomeTaxExpenseBenefit 469,000,000us-gaap_IncomeTaxExpenseBenefit Ìý Ìý Ìý Ìý
Charter Communications Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Equity Method Investment, Aggregate Cost Ìý Ìý Ìý Ìý Ìý Ìý 2,600,000,000us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
excess amortization in share of earnings (loss) 60,000,000lmca_ExcessAmortizationInShareOfEarningsLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember 		51,000,000lmca_ExcessAmortizationInShareOfEarningsLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember 		Ìý Ìý Ìý Ìý Ìý
Percentage ownership Ìý Ìý Ìý Ìý Ìý Ìý 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember
Investments in affiliates, accounted for using the equity method Ìý 2,395,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember 		Ìý Ìý Ìý Ìý Ìý
Purchase of shares in equity method investee Ìý Ìý Ìý 26.9lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember 		Ìý Ìý Ìý
Share of earnings (losses) of affiliates, net (94,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember 		(83,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_CharterCommunicationsMember 		Ìý Ìý Ìý Ìý Ìý
SIRIUS XM Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Purchase of shares in equity method investee Ìý Ìý Ìý Ìý 50.0lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember 		50.0lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember 		Ìý
Share of earnings (losses) of affiliates, net Ìý 8,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember 		1,367,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý
Share of tax benefit of affiliates Ìý Ìý 1,229,000,000lmca_IncomeTaxBenefitFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý
Live Nation Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Percentage ownership 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý Ìý Ìý Ìý
Investments in affiliates, accounted for using the equity method 396,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		409,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý Ìý Ìý
Equity Method Investment, Quoted Market Value 1,403,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý Ìý Ìý Ìý
Purchase of shares in equity method investee 1.7lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		1.7lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		11.0lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý Ìý
Payments to Acquire Equity Method Investments 39,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		19,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		107,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý Ìý
Share of earnings (losses) of affiliates, net (30,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		(18,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		(45,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_LiveNationMember 		Ìý Ìý Ìý Ìý
Sirius XM Canada Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Percentage ownership 37.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý Ìý Ìý Ìý Ìý Ìý
Investments in affiliates, accounted for using the equity method 237,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		273,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý Ìý Ìý Ìý Ìý
Equity Method Investment, Quoted Market Value 247,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý Ìý Ìý Ìý Ìý Ìý
Share of earnings (losses) of affiliates, net 5,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		7,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmCanadaMember 		Ìý Ìý Ìý Ìý Ìý
Equity method investment, other Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Investments in affiliates, accounted for using the equity method 218,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		222,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		Ìý Ìý Ìý Ìý Ìý
Share of earnings (losses) of affiliates, net 6,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		54,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		24,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_EquityMethodInvestmentOtherMember 		Ìý Ìý Ìý Ìý
SIRIUS XM | SIRIUS XM Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income Tax Expense (Benefit) Ìý Ìý $ 3,000,000,000us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember 		Ìý Ìý Ìý Ìý