XML 123 R67.htm IDEA: XBRL DOCUMENT v3.8.0.1
Intangible Assets, Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Indefinite Lived Intangible Assets By Major Class Line Items        
Loss on Impairment   $ 262    
Goodwill   509 $ 766 $ 766
Franchise rights   255 244  
U.S. Cellular        
Indefinite Lived Intangible Assets By Major Class Line Items        
Loss on Impairment $ 227 227 0  
Goodwill   0 227 227
TDS Telecom Wireline        
Indefinite Lived Intangible Assets By Major Class Line Items        
Loss on Impairment   0 0  
Goodwill   409 409 409
TDS Telecom Cable        
Indefinite Lived Intangible Assets By Major Class Line Items        
Loss on Impairment   0 0  
Goodwill   100 95 95
TDS Telecom HMS        
Indefinite Lived Intangible Assets By Major Class Line Items        
Loss on Impairment $ 35 35 0  
Goodwill   0 35 35
TDS Telecom        
Indefinite Lived Intangible Assets By Major Class Line Items        
Franchise rights   $ 255 $ 244  
Goodwill | U.S. Cellular        
Indefinite Lived Intangible Assets By Major Class Line Items        
Accumulated impairment losses in prior periods       334
Goodwill | TDS Telecom Wireline        
Indefinite Lived Intangible Assets By Major Class Line Items        
Accumulated impairment losses in prior periods       29
Goodwill | TDS Telecom HMS        
Indefinite Lived Intangible Assets By Major Class Line Items        
Accumulated impairment losses in prior periods       84
Goodwill | Corporate, Eliminations and Other        
Indefinite Lived Intangible Assets By Major Class Line Items        
Accumulated impairment losses in prior periods       $ 4