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Debt - (Margin Loan) (Details) - Broadband Holdco, LLC - USD ($)
$ in Millions
3 Months Ended
Dec. 27, 2019
Dec. 29, 2017
Mar. 31, 2020
Nov. 25, 2019
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     $ 4,700  
Margin Loan Facility        
Debt Instrument [Line Items]        
Line of credit availability   $ 1,000    
Line of credit outstanding balance     $ 1,300  
Margin Loan Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit availability       $ 200
Proceeds from lines of credit $ 100      
Margin Loan Facility | Delayed Draw Term Loan Facility        
Debt Instrument [Line Items]        
Line of credit availability       $ 300
Proceeds from lines of credit $ 300      
Margin Loan Facility | LIBOR        
Debt Instrument [Line Items]        
Variable interest rate   1.85%