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Stock-Based Compensation, TDS excluding U.S. Cellular, Stock option rollforward schedules (Details) - TDS Parent Company - Common Shares - Stock Options - TDS Long-Term Incentive Plans - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock compensation, stock option rollforward schedule, number of shares      
Outstanding, beginning of period 9,135,000    
Exercisable options, beginning of period 6,009,000    
Granted options 694,000    
Exercised options (562,000)    
Forfeited options (67,000)    
Expired options (523,000)    
Outstanding, end of period 8,677,000 9,135,000  
Exercisable options, end of period 6,167,000 6,009,000  
Stock compensation, stock option rollforward schedule, other information      
Options outstanding, beginning of period - weighted average exercise price $ 30.29    
Options exercisable, beginning of period - weighted average exercise price 32.54    
Options granted, weighted average exercise price 29.45    
Options exercised, weighted average exercise price 22.92    
Options forfeited, weighted average exercise price 28.13    
Options expired, weighted average exercise price 42.56    
Options outstanding, end of period - weighted average exercise price 29.98 $ 30.29  
Options exercisable, end of period - weighted average exercise price $ 30.59 32.54  
Aggregate intrinsic value, options outstanding $ 19    
Aggregate intrinsic value, options exercisable $ 17    
Weighted average remaining contractual life, outstanding 4 years 10 months    
Weighted average remaining contractual life, exercisable 3 years 4 months    
Options granted, weighted average grant date fair value $ 7.24 $ 7.66 $ 8.66
Aggregate intrinsic value, options exercised $ 4 $ 4  
Maximum      
Stock compensation, stock option rollforward schedule, other information      
Aggregate intrinsic value, options exercised     $ 1