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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Licenses Activity related to U.S. Cellular's Licenses is presented below.
 
2019
 
2018
(Dollars in millions)
 
 
 
Balance at beginning of year
$
2,186

 
$
2,223

Acquisitions
267

 
8

Transferred to Assets held for sale
—

 
(51
)
Divestitures
(10
)
 
(11
)
Exchanges - Licenses received
26

 
18

Exchanges - Licenses surrendered
—

 
(1
)
Capitalized interest
2

 
—

Balance at end of year
$
2,471

 
$
2,186