Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v2.4.1.9
Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 23, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 494us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Common Class B        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		     
Common Class C        
Shares received in exchange       2lmca_NumberofsharesissuedduringtheperiodforeachshareofSeriesAandSeriesBstockheldbyshareholderspriortothedistribution
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
CEO | Common Class C        
Options granted 3,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember 		     
2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 75,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember 		     
Minimum | 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years      
Maximum | 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Employee Stock Option [Member] | 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years      
Employee Stock Option [Member] | 2013 Plan | Common Class A        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,207,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		3,656,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		   
Options granted 1,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		23,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		834,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Weighted average grant-date fair value $ 38.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		$ 55.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		$ 42.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Granted, WAEP $ 45.10us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,698,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		     
Outstanding WAEP $ 23.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		$ 30.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 22.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		     
Employee Stock Option [Member] | 2013 Plan | Common Class C        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 9,833,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Options granted 3,359,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Weighted average grant-date fair value $ 11.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Granted, WAEP $ 34.06us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 5,446,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Outstanding WAEP $ 26.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 22.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember 		     
Option Exchange [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value     358us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_NonmonetaryTransactionTypeAxis
= lmca_OptionExchangeMember 		 
Option Exchange [Member] | 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost     $ 18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_NonmonetaryTransactionTypeAxis
= lmca_OptionExchangeMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember 		 
Option Exchange [Member] | Employee Stock Option [Member] | 2013 Plan | Common Class A        
Options granted     3,713,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_NonmonetaryTransactionTypeAxis
= lmca_OptionExchangeMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Weighted average grant-date fair value     $ 37.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_NonmonetaryTransactionTypeAxis
= lmca_OptionExchangeMember
/ us-gaap_PlanNameAxis
= lmca_A2013PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember