Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures to Consolidated Statements of Cash Flows (Details)

v2.4.1.9
Supplemental Disclosures to Consolidated Statements of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Fair Value of Assets Acquired $ 1us-gaap_FairValueOfAssetsAcquired $ 2,586us-gaap_FairValueOfAssetsAcquired  
Indefinite-lived Intangible Assets, Acquired During Period 24us-gaap_IndefinitelivedIntangibleAssetsAcquired 23,694us-gaap_IndefinitelivedIntangibleAssetsAcquired  
Finite-lived Intangible Assets Acquired 36us-gaap_FinitelivedIntangibleAssetsAcquired1 1,177us-gaap_FinitelivedIntangibleAssetsAcquired1  
LiabilitiesAssumed (12)us-gaap_LiabilitiesAssumed1 (5,367)us-gaap_LiabilitiesAssumed1  
Deferred tax liabilities assumed in business combination (2)lmca_DeferredTaxLiabilitiesAssumedInBusinessCombination (760)lmca_DeferredTaxLiabilitiesAssumedInBusinessCombination  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   (10,372)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet  
Noncontrolling Interest, Increase from Business Combination   (10,841)us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination  
Payments to Acquire Businesses, Net of Cash Acquired 47us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 117us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Shares acquired in disposition of subsidiary   (937)lmca_StockRepurchaseAndRetiredDuringPeriodValueInDispositionOfSubsidiary  
Nonmonetary Transaction, Gain (Loss) Recognized on Transfer   (496)us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer  
Tax expense (benefit) on exchange transaction   (5)lmca_Taxexpensebenefitonexchangetransaction  
Cash paid in exchange transaction   429lmca_Cashincludedinexchangetransaction  
Stock repuchased by subsidiary not settled at end of period 26lmca_StockRepuchasedBySubsidiaryNotSettledAtEndOfPeriod    
Cash paid for interest 232us-gaap_InterestPaid 144us-gaap_InterestPaid 3us-gaap_InterestPaid
Cash paid (received) for income taxes 20us-gaap_IncomeTaxesPaidNet (75)us-gaap_IncomeTaxesPaidNet 129us-gaap_IncomeTaxesPaidNet
Leisure Arts [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Increase (Decrease) in Carrying Value of Assets Received as Consideration in Disposal of Business   (19)lmca_Carryingvalueofbusinessdeconsolidated
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lmca_LeisureArtsMember
 
Cash held by business deconsolidated   $ 12lmca_Cashheldbybusinessdeconsolidated
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lmca_LeisureArtsMember