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Stock-Based Compensation - Long-Term Performance-Based Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 04, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based compensation additional disclosures                
Vested (in shares)   (916,315) (11,175) (11,935)        
Other Employee Performance Awards                
Share-based compensation additional disclosures                
Vested (in shares)   0            
2019 LTIP                
Share-based compensation additional disclosures                
Percentage of performance goals probable of achievement   95.00% 90.00% 82.00%        
Percentage of award vested   58.00%            
Vested (in shares)   0            
LTIP 2013                
Share-based compensation additional disclosures                
Portion meeting vesting condition (as a percent)       20.00%        
Percentage of performance goals probable of achievement           30.00% 10.00% 20.00%
Vested (in shares)   0            
LTIP 2017                
Share-based compensation additional disclosures                
Percentage of performance goals probable of achievement       75.00% 75.00%      
Reversed of non-cash, stock-based compensation expense   $ 13            
Ergen 2020 Performance Award                
2005 LTIP Terms                
Awards vesting period 10 years              
Share-based compensation additional disclosures                
Awards vesting period 10 years              
Class A common stock | Ergen 2020 Performance Award                
Share-based compensation additional disclosures                
Granted 12,500,000