Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 4)

v2.4.1.9
Debt (Details 4) (USD $)
3 Months Ended 12 Months Ended 15 Months Ended 0 Months Ended
Mar. 31, 2015
Dec. 31, 2014
acre
Mar. 31, 2015
Mar. 31, 2015
Apr. 30, 2015
Debt Instrument [Line Items]          
Borrowings of debt $ 1,275,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt        
ANLBC          
Debt Instrument [Line Items]          
Area of land aquired (in acres)   82lmca_AreaOfLandAcquiredInAcres
/ dei_LegalEntityAxis
= lmca_AnlbcMember
     
Number of credit facilities 2lmca_NumberOfCreditFacilities
/ dei_LegalEntityAxis
= lmca_AnlbcMember
       
ANLBC | Cobb County Major League Baseball Ballpark          
Debt Instrument [Line Items]          
Construction and Development Costs     131,000,000us-gaap_ConstructionAndDevelopmentCosts
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
   
Line of Credit Facility, Maximum Borrowing Capacity 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
  250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
ANLBC | Cobb County Major League Baseball Ballpark | Revolving Credit Facility          
Debt Instrument [Line Items]          
Borrowings of debt 110,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
       
ANLBC | Forecast | Cobb County Major League Baseball Ballpark          
Debt Instrument [Line Items]          
Construction and Development Costs       672,000,000us-gaap_ConstructionAndDevelopmentCosts
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Other costs and equipment       50,000,000lmca_OtherCostsAndEquipment
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Cobb County Major League Baseball Ballpark          
Debt Instrument [Line Items]          
Due from affiliate 392,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
  392,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
392,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
 
ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Ballpark Mixed Use Development          
Debt Instrument [Line Items]          
Due from affiliate 363,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyBallparkMixedUseDevelopmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
  363,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyBallparkMixedUseDevelopmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
363,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyBallparkMixedUseDevelopmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
ANLBC | Affiliated Entities | Forecast | Cobb County Ballpark Mixed Use Development          
Debt Instrument [Line Items]          
Construction and Development Costs       452,000,000us-gaap_ConstructionAndDevelopmentCosts
/ us-gaap_CounterpartyNameAxis
= lmca_AffiliatedEntitiesMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyBallparkMixedUseDevelopmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Major League Baseball Ballpark | Bonds Payable          
Debt Instrument [Line Items]          
Debt issuance amount $ 368,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
  $ 368,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
$ 368,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember