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Basis of Presentation (Details)
Mar. 31, 2019
market
country
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Residential and Business-to-Business Services        
Basis of Presentation [Line Items]        
Number of countries in which entity provides services | country 24      
C&W | Wholesale Communication Services        
Basis of Presentation [Line Items]        
Number of markets (over) | market 40      
Liberty Costa Rica        
Basis of Presentation [Line Items]        
Percentage ownership in subsidiary 80.00%      
UTS | C&W        
Basis of Presentation [Line Items]        
Percentage ownership in subsidiary 87.50%      
C&W Panama | C&W        
Basis of Presentation [Line Items]        
Percentage ownership in subsidiary 49.00%      
BTC | C&W        
Basis of Presentation [Line Items]        
Percentage ownership in subsidiary 49.00%      
C&W Jamaica        
Basis of Presentation [Line Items]        
Percentage ownership in subsidiary   82.00%    
C&W Jamaica | C&W        
Basis of Presentation [Line Items]        
Percentage ownership in subsidiary     92.30% 91.70%