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Shareholders' Equity - Narrative (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2017
shares
Nov. 30, 2009
shares
Dec. 31, 2021
USD ($)
vote
director
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 02, 2013
USD ($)
Shareholders' equity, other disclosures            
Gross proceeds     $ 1,110,000,000 $ 0 $ 0  
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     $ 177,000,000      
Common Shares | Share Conversion            
Shareholders' equity, other disclosures            
Shares reserved (in shares) | shares     7,331,000      
Common Shares | Tax-Deferred Savings Plan            
Shareholders' equity, other disclosures            
Shares reserved (in shares) | shares     90,000      
UScellular Common Shares | UScellular            
Share repurchases            
Repurchase authorization, additional number of shares per year (in shares) | shares   1,300,000        
Repurchase authorization, cumulative shares authorized (in shares) | shares     3,517,000      
UScellular Common Shares | UScellular | Maximum            
Share repurchases            
Repurchase authorization, additional number of shares per year (in shares) | shares 1,300,000          
UScellular Common Shares | UScellular | Minimum            
Share repurchases            
Repurchase authorization, additional number of shares per year (in shares) | shares 0          
Series UU Preferred Shares            
Shareholders' equity, other disclosures            
Shares issued | shares     16,800      
Interest rate     6.625%      
Shares issued (price per share) | $ / shares     $ 25,000      
Gross proceeds     $ 420,000,000      
Depositary shares     16,800,000      
Net cash proceeds     406,000,000      
Issuance costs     $ 14,000,000      
Redemption price per Preferred Share | $ / shares     $ 25,000      
Common Shares issued upon conversion | shares     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 | shares     27,600      
Interest rate     6.00%      
Shares issued (price per share) | $ / shares     $ 25,000      
Gross proceeds     $ 690,000,000      
Depositary shares     27,600,000      
Net cash proceeds     668,000,000      
Issuance costs     $ 22,000,000      
Redemption price per Preferred Share | $ / shares     $ 25,000      
Common Shares issued upon conversion | shares     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      
Preferred Shares            
Shareholders' equity, other disclosures            
Liquidation preference per share (in dollars per share)     $ 25,000      
Redemption price per Preferred Share | $ / shares     $ 25,000