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Intangible Assets, Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Indefinite Lived Intangible Assets By Major Class Line Items    
Loss on impairment $ 262  
Goodwill 508 $ 766
Franchise rights    
Indefinite Lived Intangible Assets By Major Class Line Items    
Other 0  
U.S. Cellular    
Indefinite Lived Intangible Assets By Major Class Line Items    
Loss on impairment 227  
Goodwill 0 227
U.S. Cellular | Goodwill    
Indefinite Lived Intangible Assets By Major Class Line Items    
Accumulated impairment losses in prior periods   334
TDS Telecom Wireline    
Indefinite Lived Intangible Assets By Major Class Line Items    
Loss on impairment 0  
Goodwill 409 409
TDS Telecom Wireline | Goodwill    
Indefinite Lived Intangible Assets By Major Class Line Items    
Accumulated impairment losses in prior periods   29
TDS Telecom Cable    
Indefinite Lived Intangible Assets By Major Class Line Items    
Loss on impairment 0  
Goodwill 99 95
TDS Telecom Cable | Goodwill    
Indefinite Lived Intangible Assets By Major Class Line Items    
Accumulated impairment losses in prior periods   0
TDS Telecom HMS    
Indefinite Lived Intangible Assets By Major Class Line Items    
Loss on impairment 35  
Goodwill $ 0 35
TDS Telecom HMS | Goodwill    
Indefinite Lived Intangible Assets By Major Class Line Items    
Accumulated impairment losses in prior periods   84
Corporate, Eliminations and Other | Goodwill    
Indefinite Lived Intangible Assets By Major Class Line Items    
Accumulated impairment losses in prior periods   $ 4