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Intangible Assets (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
TDS Telecom Cable  
Intangible assets, other disclosures  
Goodwill acquired during period $ 4
Other intangible assets acquired 1
Licenses  
Licenses  
Balance, beginning of period 1,895
Acquisitions 331
Transferred to Assets held for sale (4)
Exchanges - Licenses received 14
Exchanges - Licenses surrendered (1)
Balance, end of period $ 2,235