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Investment in Expedia - Text (Details) - item
Nov. 05, 2016
Nov. 03, 2016
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Proxy period (in months) 18 months    
Liberty Interactive | Expedia      
Schedule of Equity Method Investments [Line Items]      
Percentage of members of board which can be appointed by the company   20.00%  
Number of members in board of directors   13  
Number of directors appointed by the company   3  
Maximum equity interest that can be acquired   20.01%  
Expedia      
Schedule of Equity Method Investments [Line Items]      
Percentage of equity interest     15.60%
Voting interest     52.00%