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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings per share
The amounts used in computing basic and diluted earnings per share attributable to TDS shareholders were as follows:
Year Ended December 31,202020192018
(Dollars and shares in millions, except per share amounts)   
Net income attributable to TDS shareholders used in basic earnings per share$226 $121 $135 
Adjustments to compute diluted earnings:
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:
Common Shares107 107 105 
Series A Common Shares7 7 7 
Total114 114 112 
Effects of dilutive securities1 2 2 
Weighted average number of shares used in diluted earnings per share115 116 114 
Basic earnings per share attributable to TDS shareholders$1.97 $1.06 $1.20 
Diluted earnings per share attributable to TDS shareholders$1.93 $1.03 $1.17