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Goodwill and Intangible Assets - Estimated Useful Life (Details)
 12 Months Ended
Dec. 31, 2020
FCC spectrum licenses | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated Useful Life (in years) 18 years
FCC spectrum licenses | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated Useful Life (in years) 30 years
Subscriber relationships | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated Useful Life (in years) 3 years
Subscriber relationships | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated Useful Life (in years) 10 years
Other intangibles | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated Useful Life (in years) 15 years
Other intangibles | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated Useful Life (in years) 20 years