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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Related Party Transactions:        
Dr. John Malone's voting interest in Liberty Broadband (percentage) 47.10%   47.10%  
Dr. John Malone's voting interest in Qurate Retail, Inc. (percentage) 37.50%   37.50%  
Cash payments received from HSN, Inc. and QVC, Inc. $ 18 $ 17 $ 51 $ 50
Dr. John Malone's voting interest in Discovery Communications, Inc. for election of directors (percentage) 28.00%   28.00%  
Advance Newhouse Programming Partnership's ownership percentage in Series A preferred stock of Discovery Communications, Inc. (percentage) 100.00%   100.00%  
Advance Newhouse Programming Partnership's ownership percentage in Series C preferred stock of Discovery Communications, Inc. (percentage) 100.00%   100.00%  
Advance Newhouse Programming Partnership's voting interest in Discovery Communications, Inc. for election of directors 24.20%   24.20%  
Maximum [Member]        
Related Party Transactions:        
Carrying value of noncontrolling interst purchased     $ 400  
Percent of total operating costs and expenses paid to Discovery Communications, Inc. and Starz (percentage) 3.00% 3.00% 3.00% 3.00%
Equity Method Investee [Member]        
Related Party Transactions:        
Payments to related parties $ 99 $ 62 $ 248 $ 208
Class B Common Stock [Member]        
Related Party Transactions:        
Dr. John Malone's ownership percentage in Discovery Communications, Inc. (percentage) 93.60%   93.60%  
Common Class C [Member]        
Related Party Transactions:        
Dr. John Malone's ownership percentage in Discovery Communications, Inc. (percentage) 6.00%   6.00%