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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Related Party Transactions:        
Gregory Maffei's voting interest in Liberty Broadband (percentage) 12.60%   12.60%  
Dr. John Malone's voting interest in Liberty Broadband (percentage) 45.80%   45.80%  
Gregory Maffei's voting interest in Qurate Retail, Inc. (percentage) 6.30%   6.30%  
Dr. John Malone's voting interest in Qurate Retail, Inc. (percentage) 41.20%   41.20%  
Cash payments received from HSN, Inc. and QVC, Inc. $ 10 $ 12 $ 33 $ 36
Dr. John Malone's voting interest in Discovery Communications, Inc. for election of directors (percentage) 26.50%   26.50%  
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 (percentage) 23.20%   23.20%  
Maximum        
Related Party Transactions:        
Percent of total operating costs and expenses paid to Discovery Communications, Inc. and Starz (percentage) 2.00% 2.00% 2.00% 2.00%
Equity Method Investee        
Related Party Transactions:        
Payments to related parties $ 52 $ 50 $ 169 $ 167
Class A Common Stock        
Related Party Transactions:        
Dr. John Malone's ownership percentage in Discovery Communications, Inc. (percentage) 1.00%   1.00%  
Class B Common Stock        
Related Party Transactions:        
Dr. John Malone's ownership percentage in Discovery Communications, Inc. (percentage) 95.00%   95.00%  
Class C Common Stock        
Related Party Transactions:        
Dr. John Malone's ownership percentage in Discovery Communications, Inc. (percentage) 3.70%   3.70%