Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 2)

v2.4.1.9
Stock-Based Compensation (Details 2) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Total unrecognized compensation cost related to unvested equity awards $ 69us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Weighted average period of recognition related to unvested Liberty equity awards (in years) 2 years 6 months  
Stock-based compensation 44us-gaap_ShareBasedCompensation 49us-gaap_ShareBasedCompensation
SIRIUS XM    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding options, Ending Balance 249,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Exercisable options 105,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Outstanding WAEP, End of period $ 2.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Exercisable WAEP $ 2.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Exercisable Options, Aggregate Intrinsic Value 181us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 287us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Total unrecognized compensation cost related to unvested equity awards 198us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
 
Weighted average period of recognition related to unvested Liberty equity awards (in years) 2 years  
SIRIUS XM | SIRIUS XM    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Stock-based compensation $ 37us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_SiriusXmMember
$ 36us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= lmca_SiriusXmMember
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_SiriusXmMember