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Shareholders' Equity - Narrative (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2017
shares
Nov. 30, 2009
shares
Dec. 31, 2024
USD ($)
director
vote
$ / shares
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Aug. 02, 2013
USD ($)
Share repurchases              
Purchase price | $       $ 6,000,000 $ 40,000,000    
Series A Common Shares              
Shareholders' equity, other disclosures              
Number of votes | vote     10        
Number of directors entitled to elect shares | director     8        
Common Shares              
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
Repurchase authorization, maximum dollar value | $     $ 132,000,000        
Common Shares | Share Conversion              
Shareholders' equity, other disclosures              
Shares reserved (in shares)     7,534,000        
Common Shares | Tax-Deferred Savings Plan              
Shareholders' equity, other disclosures              
Shares reserved (in shares)     916,000        
UScellular Common Shares | UScellular              
Share repurchases              
Repurchase authorization, additional number of shares per year (in shares)   1,300,000          
Repurchase of Common Shares     939,999        
Purchase price | $     $ 55,000,000        
Average cost per share | $ / shares     $ 58.06        
Repurchase authorization, cumulative shares authorized (in shares)     986,942        
UScellular Common Shares | UScellular | Maximum              
Share repurchases              
Repurchase authorization, additional number of shares per year (in shares) 1,300,000            
UScellular Common Shares | UScellular | Minimum              
Share repurchases              
Repurchase authorization, additional number of shares per year (in shares) 0            
Series UU Preferred Shares              
Shareholders' equity, other disclosures              
Shares issued           16,800  
Interest rate     6.625%     6.625%  
Shares issued (price per share) | $ / shares           $ 25,000  
Depositary shares | $           $ 16,800,000  
Liquidation preference per share (in dollars per share) | $     $ 25,000        
Redemption price per Preferred Share | $ / shares     $ 25,000        
Common Shares issued upon conversion     2,773.2        
Series UU Preferred Shares | Redemption price after credit rating downgrade              
Shareholders' equity, other disclosures              
Redemption price per Preferred Share | $ / shares     $ 25,500        
Series UU Preferred Shares | Redemption price after change in control              
Shareholders' equity, other disclosures              
Redemption price per Preferred Share | $ / shares     $ 25,000        
Series VV Preferred Shares              
Shareholders' equity, other disclosures              
Shares issued           27,600  
Interest rate     6.00%     6.00%  
Shares issued (price per share) | $ / shares           $ 25,000  
Depositary shares | $           $ 27,600,000  
Liquidation preference per share (in dollars per share) | $     $ 25,000        
Redemption price per Preferred Share | $ / shares     $ 25,000        
Common Shares issued upon conversion     2,584        
Series VV Preferred Shares | Redemption price after credit rating downgrade              
Shareholders' equity, other disclosures              
Redemption price per Preferred Share | $ / shares     $ 25,500        
Series VV Preferred Shares | Redemption price after change in control              
Shareholders' equity, other disclosures              
Redemption price per Preferred Share | $ / shares     $ 25,000