Quarterly report pursuant to Section 13 or 15(d)

Information About Liberty's Operating Segments (Details 1)

v2.4.1.9
Information About Liberty's Operating Segments (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Operating Activities And Reporting Information By Segment [Line Items]    
Assets $ 31,430us-gaap_Assets $ 31,207us-gaap_Assets
Investments in affiliates, accounted for using the equity method 798us-gaap_EquityMethodInvestments 851us-gaap_EquityMethodInvestments
Payments to Acquire Productive Assets 64us-gaap_PaymentsToAcquireProductiveAssets  
SIRIUS XM    
Operating Activities And Reporting Information By Segment [Line Items]    
Assets 28,334us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_SiriusXmMember
 
Investments in affiliates, accounted for using the equity method 227us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_SiriusXmMember
 
Payments to Acquire Productive Assets 30us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= lmca_SiriusXmMember
 
Corporate And Other    
Operating Activities And Reporting Information By Segment [Line Items]    
Assets 3,096us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
 
Investments in affiliates, accounted for using the equity method 571us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
 
Payments to Acquire Productive Assets $ 34us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember