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Intangible Assets and Goodwill, Net - Assumptions used in fair value calculations of goodwill and intangible assets (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Intangible Assets and Goodwill, Net    
Percentage of discount rate change required for the carrying amount to equal the recoverable amount 3.60%  
Percentage of long-term rate change required for the carrying amount to equal the recoverable amount (14.00%)  
Minimum | Other Businesses    
Intangible Assets and Goodwill, Net    
Long-term growth rate (as a percentage) 1.00% 3.50%
Discount rate (as a percentage) 14.30% 14.60%
Minimum | Cable    
Intangible Assets and Goodwill, Net    
Long-term growth rate (as a percentage) 3.50% 3.50%
Discount rate (as a percentage) 11.00% 10.90%
Maximum | Other Businesses    
Intangible Assets and Goodwill, Net    
Long-term growth rate (as a percentage) 5.90% 3.50%
Discount rate (as a percentage) 14.60% 15.60%
Maximum | Cable    
Intangible Assets and Goodwill, Net    
Long-term growth rate (as a percentage) 3.50% 3.50%
Discount rate (as a percentage) 11.50% 11.20%