XML 136 R90.htm IDEA: XBRL DOCUMENT v3.10.0.1
Common Shareholders' Equity - Narrative (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2009
shares
Dec. 31, 2017
shares
Dec. 31, 2018
director
vote
shares
Aug. 02, 2013
USD ($)
Series A Common Shares        
Common shareholders' equity, other disclosures        
Number of votes | vote     10  
Number of directors entitled to elect shares | director     8  
Common Shares        
Common shareholders' equity, other disclosures        
Number of votes | vote     1  
Number of directors entitled to elect shares | director     4  
Share repurchases        
Repurchase authorization | $       $ 250,000,000
Common Shares | Share Conversion        
Common shareholders' equity, other disclosures        
Shares reserved (in shares)     7,288,000  
Common Shares | Tax-Deferred Savings Plan        
Common shareholders' equity, other disclosures        
Shares reserved (in shares)     90,000  
U S Cellular Common Shares | U.S. Cellular        
Share repurchases        
Repurchase authorization, additional number of shares per year (in shares) 1,300,000      
Repurchase authorization, cumulative shares authorized (in shares)     5,901,000  
U S Cellular Common Shares | U.S. Cellular | Maximum        
Share repurchases        
Repurchase authorization, additional number of shares per year (in shares)   1,300,000    
U S Cellular Common Shares | U.S. Cellular | Minimum        
Share repurchases        
Repurchase authorization, additional number of shares per year (in shares)   0