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Acquisitions and Divestitures - Bluegrass Cellular (Details)
customer in Thousands, $ in Millions
1 Months Ended
Mar. 31, 2021
USD ($)
Oct. 31, 2020
customer
county
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 28,603 $ 24,773 $ 24,389
Bluegrass Cellular, Certain Assets          
Business Acquisition [Line Items]          
Number of customers | customer   210      
Number of counties customers are serviced | county   34      
Business acquisition consideration $ 412        
Property, plant and equipment, net     141    
Other intangible assets     135    
Goodwill     $ 92