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Stock-Based Compensation - TDS excluding UScellular, Stock options (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2021
TDS Long-Term Incentive Plans | Stock Options | TDS    
Black Scholes valuation model assumptions    
Expected life   6 years 3 months 18 days
Expected annual volatility rate   36.60%
Dividend yield   2.80%
Risk-free interest rate   1.10%
Common Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Common Shares | TDS Long-Term Incentive Plans | Stock Options | TDS    
Stock compensation, number of shares    
Outstanding, beginning of period (in shares) 3,098,000  
Exercised options (in shares) (7,000)  
Forfeited options (in shares) (18,000)  
Expired options (in shares) (556,000)  
Outstanding, end of period (in shares) 2,517,000  
Exercisable options, end of period (in shares) 2,280,000  
Stock compensation, other information    
Options outstanding, beginning of period - weighted average exercise price (USD per share) $ 26.37  
Options exercised, weighted average exercise price (USD per share) 19.15  
Options forfeited, weighted average exercise price (USD per share) 22.66  
Options expired, weighted average exercise price (USD per share) 25.02  
Options outstanding, end of period - weighted average exercise price (USD per share) 26.72  
Options exercisable, end of period - weighted average exercise price (USD per share) $ 26.86  
Aggregate intrinsic value, options outstanding $ 0  
Aggregate intrinsic value, options exercisable $ 0  
Weighted average remaining contractual life, outstanding 3 years 6 months  
Weighted average remaining contractual life, exercisable 3 years 1 month 6 days  
Options granted, weighted average grant date fair value   $ 6.86
Common Shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 10 years