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Segment Reporting (Narrative) (Details)
6 Months Ended
Jun. 30, 2017
market
country
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Threshold percentage used to determine reportable segments using one of three criteria of revenue, operating cash flow or total assets 10.00%  
Performance measures, percentage of reportable segment revenue and operating cash flow presented 100.00%  
VodafoneZiggo JV [Member]    
Segment Reporting Information [Line Items]    
Percentage of minority interest revenues and expenses included in net earnings attributable to noncontrolling interest 100.00%  
Ownership percentage   50.00%
Consumer and Business-to-Business Services [Member] | Latin America and the Caribbean [Member]    
Segment Reporting Information [Line Items]    
Number of countries in which entity provides services 18  
Consumer and Business-to-Business Services [Member] | Outside of Latin America and Caribbean [Member]    
Segment Reporting Information [Line Items]    
Number of countries in which entity provides services 1  
Sub-Sea Networks [Member] | Cable & Wireless Communications Limited (CWC) [Member]    
Segment Reporting Information [Line Items]    
Number of markets | market 40  
Total European Operations Division [Member]    
Segment Reporting Information [Line Items]    
Number of European countries in operating segment (in countries) 11  
Telenet and Liberty Puerto Rico [Member]    
Segment Reporting Information [Line Items]    
Percentage of minority interest revenues and expenses included in net earnings attributable to noncontrolling interest 100.00%