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Segment Information (Narrative) (Details)
customer in Millions, activated_line in Millions
Dec. 31, 2019
activated_line
customer
Cable Communications [Member]  
Segment Reporting Information [Line Items]  
Total customer relationships 31.5
Cable Communications [Member] | High-speed Internet Customers [Member]  
Segment Reporting Information [Line Items]  
Number of customers 28.6
Cable Communications [Member] | Video Customers [Member]  
Segment Reporting Information [Line Items]  
Number of customers 21.3
Cable Communications [Member] | Voice Customers [Member]  
Segment Reporting Information [Line Items]  
Number of customers 11.3
Cable Communications [Member] | Security and Automation Customers [Member]  
Segment Reporting Information [Line Items]  
Number of customers 1.4
Cable Communications [Member] | Wireless Phone Service [Member]  
Segment Reporting Information [Line Items]  
Number of activated lines | activated_line 2.1
Cable Communications [Member] | Residential [Member]  
Segment Reporting Information [Line Items]  
Total customer relationships 29.1
Cable Communications [Member] | Business Customers [Member]  
Segment Reporting Information [Line Items]  
Total customer relationships 2.4
Sky Limited [Member]  
Segment Reporting Information [Line Items]  
Retail customer relationships 24.0