Annual report pursuant to Section 13 and 15(d)

Sirius XM Transactions (Details)

v2.4.1.9
Sirius XM Transactions (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 15 Months Ended 1 Months Ended
Oct. 31, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 18, 2013
Nov. 04, 2013
Apr. 25, 2014
Nov. 14, 2013
Dec. 31, 2014
tranche
Aug. 31, 2014
May 31, 2014
Oct. 31, 2014
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       $ (10,372,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet                  
Preferred Stock, Par or Stated Value Per Share     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare           $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain   7,500,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain                      
Goodwill     14,345,000,000us-gaap_Goodwill 14,365,000,000us-gaap_Goodwill 200,000,000us-gaap_Goodwill         14,345,000,000us-gaap_Goodwill      
Goodwill, Acquired During Period       14,165,000,000us-gaap_GoodwillAcquiredDuringPeriod                  
Stock Repurchased and Retired During Period, Shares     0us-gaap_StockRepurchasedAndRetiredDuringPeriodShares                    
Payments for Repurchase of Common Stock       140,000,000us-gaap_PaymentsForRepurchaseOfCommonStock 323,000,000us-gaap_PaymentsForRepurchaseOfCommonStock                
Shares retired 6,300,000us-gaap_TreasuryStockSharesRetired                        
SIRIUS XM                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net           10,372,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets           253,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain   7,500,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
                     
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value   10,215,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
                     
Initial noncontrolling interest   10,286,000,000lmca_BusinessCombinationStepAcquisitionInitialNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
                     
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value           10,841,000,000us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net           21,466,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents           569,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables           210,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment           1,714,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Goodwill           13,775,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles           930,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Current Assets, Prepaid Expense and Other Assets           480,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt           (2,490,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Current Liabilities, Deferred Revenue           (1,565,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liability), Net, Noncurrent           (685,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
Business Acquisition, Purchase Price Allocation, Other Liabilities           (1,002,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
             
SIRIUS XM | Maximum                          
Business Acquisition [Line Items]                          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                     
SIRIUS XM | Pro Forma [Member]                          
Business Acquisition [Line Items]                          
Revenue         3,730,000,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Operating income (loss)         686,000,000lmca_BusinessAcquisitionProFormaOperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Interest expense         (162,000,000)lmca_BusinessAcquisitionProFormaInterestExpense
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Share of earnings (loss) of affiliates         (21,000,000)lmca_BusinessAcquisitionProFormaShareOfEarningsLossOfAffiliates
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Less earnings (loss) attributable to the noncontrolling interest         1,736,000,000lmca_BusinessAcquisitionProFormaNetEarningsLossAttributableToNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Net Earnings (loss) from continuing operatins attributable to Liberty stockholders         2,052,000,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Pro Forma basic net earnings (loss) from continuing operations attributable to Liberty stockholders per common share (note 2)         $ 5.68us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Pro Forma diluted net earnings (loss) from continuing operations attributable to Liberty stockholders per common share (note 2)         $ 5.52us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
SIRIUS XM                          
Business Acquisition [Line Items]                          
Purchase of shares in equity method investee   50,000,000lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
      50,000,000lmca_PurchaseOfSharesInEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
             
Preferred Stock, Par or Stated Value Per Share   $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
                     
Convertible Preferred Stock, Shares Issued upon Conversion   1,293,509,076us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
                     
Ownership percentage     56.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
                   
SIRIUS XM | Minimum                          
Business Acquisition [Line Items]                          
Ownership percentage   50.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lmca_SiriusXmMember
                     
FCC licences [Member] | SIRIUS XM                          
Business Acquisition [Line Items]                          
Business Acquisition, Purchase Price Allocation, Intangible Assets Not Amortizable           8,600,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= lmca_FccLicencesMember
             
Trade Names [Member] | SIRIUS XM                          
Business Acquisition [Line Items]                          
Business Acquisition, Purchase Price Allocation, Intangible Assets Not Amortizable           930,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
             
Deferred tax liability [Member] | SIRIUS XM                          
Business Acquisition [Line Items]                          
Goodwill, Allocation Adjustment       227,000,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_NonrecurringAdjustmentAxis
= lmca_DeferredtaxliabilityMember
                 
Contract fair value [Member] | SIRIUS XM                          
Business Acquisition [Line Items]                          
Goodwill, Allocation Adjustment       18,000,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= lmca_SiriusXmMember
/ us-gaap_NonrecurringAdjustmentAxis
= lmca_ContractfairvalueMember
                 
SIRIUS XM | Agero [Member]                          
Business Acquisition [Line Items]                          
Business Acquisition, Cost of Acquired Entity, Purchase Price       525,000,000us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1
/ us-gaap_BusinessAcquisitionAxis
= lmca_AgeroMember
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
                 
Goodwill, Acquired During Period             390,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= lmca_AgeroMember
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
           
SIRIUS XM | Sirius XM Liberty Repurchase Agreement [Member]                          
Business Acquisition [Line Items]                          
Stock Repurchased and Retired During Period, Shares                 43,712,265us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
136,600,826us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Payments for Repurchase of Common Stock               340,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
  500,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Number of tranches for stock repurchase                   3lmca_NumberOfTranchesOfStockRepurchase
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Treasury Stock Acquired, Average Cost Per Share                   $ 3.6603us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Share repurchases, discount from market price                   1.50%lmca_Sharerepurchasesdiscountfrommarketprice
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Shares Repurchased Discount From Market Measurement Period                   10 days      
Volume weighted average share price, cap     $ 4.18lmca_Volumeweightedaveragesharepricecap
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
            $ 4.18lmca_Volumeweightedaveragesharepricecap
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Volume weighted average share price, floor     $ 3.64lmca_Volumeweightedaveragesharepricefloor
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
            $ 3.64lmca_Volumeweightedaveragesharepricefloor
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
Stock repurchased as a percentage of shares outstanding                   2.00%lmca_Stockrepurchasedasapercentageofsharesoutstanding
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_SiriusxmLibertyRepurchaseAgreementMember
     
SIRIUS XM | May Accelerated Share Repurchase Agreement [member]                          
Business Acquisition [Line Items]                          
Stock Repurchased and Retired During Period, Shares                     39,346,125us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_MayAcceleratedShareRepurchaseAgreementMember
112,500,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_MayAcceleratedShareRepurchaseAgreementMember
 
Payments for Repurchase of Common Stock                       600,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_MayAcceleratedShareRepurchaseAgreementMember
 
Stock Repurchase Program, Authorized Amount                       600,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_MayAcceleratedShareRepurchaseAgreementMember
 
Share Repurchase Payment Adjustment                     94,000,000lmca_ShareRepurchasePaymentAdjustment
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_MayAcceleratedShareRepurchaseAgreementMember
   
SIRIUS XM | August Accelerated Share Repurchase Agreement [Member]                          
Business Acquisition [Line Items]                          
Stock Repurchased and Retired During Period, Shares                     51,884,795us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_AugustAcceleratedShareRepurchaseAgreementMember
  19,431,708us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_AugustAcceleratedShareRepurchaseAgreementMember
Payments for Repurchase of Common Stock                     250,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_AugustAcceleratedShareRepurchaseAgreementMember
   
Stock Repurchase Program, Authorized Amount                     250,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_ShareRepurchaseProgramAxis
= lmca_AugustAcceleratedShareRepurchaseAgreementMember
   
OEM Relationship and Computer Software [Member] | SIRIUS XM | Agero [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles       $ 247,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lmca_AgeroMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lmca_OemRelationshipAndComputerSoftwareMember
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
                 
OEM relationship [Member] | SIRIUS XM | Agero [Member]                          
Business Acquisition [Line Items]                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life             15 years            
Computer Software, Intangible Asset [Member] | SIRIUS XM | Agero [Member]                          
Business Acquisition [Line Items]                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life             10 years