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Stock-Based Compensation - UScellular, Restricted Stock Units (Details) - UScellular Long-Term Incentive Plans - Common Shares - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Stock based compensation, Nonvested shares rollforward, number of shares      
Nonvested stock units, beginning of period - Number of shares (in shares) 2,548,000    
Granted number of shares (in shares) 728,000    
Vested number of shares (in shares) (782,000)    
Forfeited number of shares (in shares) (56,000)    
Nonvested stock units, end of period - Number of shares (in shares) 2,438,000 2,548,000  
Stock based compensation, Nonvested shares weighted average grant date fair value      
Nonvested stock units - beginning of period weighted average grant date fair value (USD per share) $ 27.26    
Granted weighted average grant date fair value (USD per share) 35.67 $ 21.15 $ 30.35
Vested weighted average grant date fair value (USD per share) 31.98    
Forfeited weighted average grant date fair value (USD per share) 27.68    
Nonvested stock units - end of period weighted average grant date fair value (USD per share) $ 29.01 $ 27.26  
Shares issued and granted under stock compensation plans      
Fair value of vested stock units $ 28 $ 12 $ 9
Award vesting period 2 years    
Maximum      
Shares issued and granted under stock compensation plans      
Award vesting period 3 years    
Minimum      
Shares issued and granted under stock compensation plans      
Annual vesting percentage 33.33%    
2024 Modifications | UScellular      
Shares issued and granted under stock compensation plans      
Incremental expense of award modification $ 4