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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Licenses
Activity related to U.S. Cellular's Licenses is presented below.
 
2018
 
2017
(Dollars in millions)
 
 
 
Balance at beginning of year
$
2,223

 
$
1,886

Acquisitions
8

 
331

Transferred to Assets held for sale1
(51
)
 
(10
)
Divestitures
(11
)
 
—

Exchanges - Licenses received
18

 
25

Exchanges - Licenses surrendered
(1
)
 
(9
)
Balance at end of year
$
2,186

 
$
2,223


1 
Licenses classified as Assets held for sale in 2018 are included in transactions which closed in the first quarter of 2019.