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Stock-Based Compensation - TDS excluding UScellular, Stock options (Details) - Common Shares - TDS Long-Term Incentive Plans - Stock Options - TDS
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
shares
Stock compensation, number of shares  
Outstanding, beginning of period (in shares) | shares 2,517,000
Exercised options (in shares) | shares (357,000)
Forfeited options (in shares) | shares (4,000)
Expired options (in shares) | shares (543,000)
Outstanding, end of period (in shares) | shares 1,613,000
Exercisable options, end of period (in shares) | shares 1,613,000
Stock compensation, other information  
Options outstanding, beginning of period - weighted average exercise price (USD per share) | $ / shares $ 26.72
Options exercised, weighted average exercise price (USD per share) | $ / shares 25.69
Options forfeited, weighted average exercise price (USD per share) | $ / shares 25.36
Options expired, weighted average exercise price (USD per share) | $ / shares 26.88
Options outstanding, end of period - weighted average exercise price (USD per share) | $ / shares 26.90
Options exercisable, end of period - weighted average exercise price (USD per share) | $ / shares $ 26.90
Aggregate intrinsic value, options outstanding | $ $ 12
Aggregate intrinsic value, options exercisable | $ $ 12
Weighted average remaining contractual life, outstanding 2 years 10 months 24 days
Weighted average remaining contractual life, exercisable 2 years 10 months 24 days