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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Licenses
Activity related to Licenses for the three months ended March 31, 2019, is presented below:
 
Licenses
(Dollars in millions)
 
Balance at December 31, 2018
$
2,186

Acquisitions
1

Exchanges - Licenses received
26

Balance at March 31, 2019
$
2,213