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Investments In Affiliates Accounted For Using The Equity Method (Details 3) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Oct. 31, 2012
Mar. 31, 2012
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Long-term Debt, Gross     $ 7,966,000,000us-gaap_DebtInstrumentCarryingAmount    
Cash proceeds from dispositions of investments     163,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 1,137,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 692,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Investments in affiliates, accounted for using the equity method     1,633,000,000us-gaap_EquityMethodInvestments 1,237,000,000us-gaap_EquityMethodInvestments  
FTD          
Proceeds from Divestiture of Interest in Consolidated Subsidiaries     145,000,000us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_FTDMember
   
Equity Method Investment, Ownership Percentage     35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_FTDMember
   
Number of shares of stock received     10.2linta_Numberofsharesofstockreceivedinsaleofaconsolidatedsubsidiary
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_FTDMember
   
HSN, Inc.          
Equity Method Investment, Ownership Percentage     38.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
   
QVC 4.375% Senior Secured Notes due 2023          
Principal amount     750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= linta_Qvc4375SeniorSecuredNotesDue2023Member
   
Liberty Interactive common stock          
Long-term Debt, Gross     5,824,000,000us-gaap_DebtInstrumentCarryingAmount
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
   
Cash proceeds from dispositions of investments       1,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
 
Investments in affiliates, accounted for using the equity method     375,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
343,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
 
Liberty Interactive common stock | HSN, Inc.          
Equity Method Investment, Dividends or Distributions     22,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
16,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
 
Equity Method Investment, Ownership Percentage     38.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
   
Investments in affiliates, accounted for using the equity method     328,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
293,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
 
Equity Method Investment, Quoted Market Value     1,521,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_HsnIncMember
   
Liberty Interactive common stock | QVC 4.375% Senior Secured Notes due 2023          
Long-term Debt, Gross     750,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= linta_Qvc4375SeniorSecuredNotesDue2023Member
/ linta_EconomicPerformanceGroupAxis
= linta_InteractiveGroupMember
   
Liberty Ventures common stock          
Long-term Debt, Gross     2,142,000,000us-gaap_DebtInstrumentCarryingAmount
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
   
Proceeds from Sale of Equity Method Investments 412,000,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
       
Cash proceeds from dispositions of investments     163,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
1,136,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
692,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
Investments in affiliates, accounted for using the equity method     1,258,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
894,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
 
Liberty Ventures common stock | Expedia          
underlying shares on forward contract   12linta_Forwardcontractnumberofunderlyingshares
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
     
Equity Method Investment, Realized Gain (Loss) on Disposal 443,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
       
Percentage board of directors members appointed     20linta_PercentMembersOfBoardOfDirectorsAppointed
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
   
Total number of board of directors members     10linta_TotalNumberOfBoardOfDirectorsMembers
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
   
per share price of forward sales contract   $ 34.316linta_PerSharePriceOfForwardSalesContract
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
     
Equity Method Investment, Dividends or Distributions     15,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
13,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
23,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
Equity Method Investment, Ownership Percentage     18.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
   
voting ownership interest in investee     58.00%linta_VotingOwnershipInterestInInvestee
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
   
Investments in affiliates, accounted for using the equity method     514,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
477,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
 
Equity Method Investment, Quoted Market Value     1,992,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_ExpediaMember
   
Liberty Ventures common stock | FTD          
Equity Method Investment, Ownership Percentage     35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_FTDMember
   
Investments in affiliates, accounted for using the equity method     355,000,000us-gaap_EquityMethodInvestments
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_FTDMember
   
Equity Method Investment, Quoted Market Value     $ 355,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ linta_EconomicPerformanceGroupAxis
= linta_VenturesGroupMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= linta_FTDMember