Annual report pursuant to Section 13 and 15(d)

Debt (Margin Loan) (Details)

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Debt (Margin Loan) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 27, 2019
Mar. 09, 2018
Dec. 29, 2017
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 25, 2019
Oct. 05, 2018
Line of Credit Facility [Line Items]                    
Distributions to Qurate Retail     $ (1,300,000,000)       $ 1,122,272,000 $ 146,680,000    
Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Line of credit, outstanding balance                 $ 100,000,000.0  
Broadband Holdco, LLC | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Line of credit, outstanding balance                   $ 200,000,000.0
Broadband Holdco, LLC | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Line of credit, outstanding balance                 800,000,000.0 800,000,000.0
Broadband Holdco, LLC | LIBOR                    
Line of Credit Facility [Line Items]                    
Basis spread on variable rate (as a percent)           1.85%        
Broadband Holdco, LLC | Series C Common Stock                    
Line of Credit Facility [Line Items]                    
Number of shares pledged as collateral (in shares) 42,681,842     42,681,842            
Amount of collateral pledged $ 5,400,000,000         $ 5,400,000,000        
Broadband Holdco, LLC | Margin Loan                    
Line of Credit Facility [Line Items]                    
Line of credit availability (up to)       $ 1,000,000,000.0            
Term of debt       2 years            
Undrawn commitment fee (up to)       1.00%            
Line of credit, outstanding balance $ 1,300,000,000.0         $ 1,300,000,000.0        
Broadband Holdco, LLC | Margin Loan | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Line of credit availability (up to)                   $ 200,000,000.0
Repayments of credit facility         $ 100,000,000.0          
Proceeds from lines of credit   $ 100,000,000.0                
Broadband Holdco, LLC | Margin Loan | Delayed Draw Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Line of credit availability (up to)                 $ 300,000,000.0  
Proceeds from lines of credit   $ 300,000,000.0                
Broadband Holdco, LLC | Margin Loan | LIBOR                    
Line of Credit Facility [Line Items]                    
Basis spread on variable rate (as a percent)       1.85%            
Qurate Retail                    
Line of Credit Facility [Line Items]                    
Distributions to Qurate Retail       $ 1,100,000,000