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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Licenses Activity related to UScellular's Licenses is presented below.
 20212020
(Dollars in millions)  
Balance at beginning of year$2,629 $2,471 
Acquisitions1,464 171 
Transferred to Assets held for sale(18)— 
Divestitures (18)
Capitalized interest13 
Balance at end of year$4,088 $2,629