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Debt - (Margin Loan) (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 05, 2018
Dec. 29, 2017
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]          
Repayments of credit facility       $ 332,071,000 $ 9,971,000
Revolving Credit Facility          
Debt Instrument [Line Items]          
Repayments of credit facility     $ 100,000,000.0    
Broadband Holdco, LLC | Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit outstanding balance $ 200,000,000.0        
Broadband Holdco, LLC | Term Loan Facility          
Debt Instrument [Line Items]          
Line of credit outstanding balance $ 800,000,000.0        
Broadband Holdco, LLC | LIBOR          
Debt Instrument [Line Items]          
Variable interest rate 1.85%        
Broadband Holdco, LLC | Series C Common Stock          
Debt Instrument [Line Items]          
Number of shares pledged as collateral (in shares)       42,681,842  
Value of shares pledged as collateral       $ 4,400,000,000  
Broadband Holdco, LLC | Margin Loan Facility          
Debt Instrument [Line Items]          
Line of credit availability   $ 1,000,000,000      
Term of debt   2 years      
Undrawn commitment fee   0.75%      
Broadband Holdco, LLC | Margin Loan Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit availability $ 200,000,000.0        
Broadband Holdco, LLC | Margin Loan Facility | LIBOR          
Debt Instrument [Line Items]          
Variable interest rate   1.85%      
Qurate Retail          
Debt Instrument [Line Items]          
Distributions to Qurate Retail   $ 1,100,000,000