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Earnings Per Share - Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per share      
Net income attributable to TDS shareholders used in basic earnings per share $ 226 $ 121 $ 135
Noncontrolling interest adjustment (3) (1) (2)
Net income attributable to TDS shareholders used in diluted earnings per share $ 223 $ 120 $ 133
Weighted average number of shares used in basic earnings per share (in shares) 114 114 112
Effects of dilutive securities (in shares) 1 2 2
Weighted average number of shares used in diluted earnings per share (in shares) 115 116 114
Basic earnings per share attributable to TDS shareholders (in dollars per share) $ 1.97 $ 1.06 $ 1.20
Diluted earnings per share attributable to TDS shareholders (in dollars per share) $ 1.93 $ 1.03 $ 1.17
Common Shares      
Earnings per share      
Weighted average number of shares used in basic earnings per share (in shares) 107 107 105
Series A Common Shares      
Earnings per share      
Weighted average number of shares used in basic earnings per share (in shares) 7   7