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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings per share
The amounts used in computing earnings per common share and the effects of potentially dilutive securities on the weighted average number of common shares were as follows:
Year Ended December 31,
2018
 
2017
 
2016
(Dollars and shares in millions, except per share amounts)
 
 
 
 
 
Basic earnings per share available to TDS common shareholders:
 

 
 
 
 
Net income available to TDS common shareholders used in basic earnings per share
$
135

 
$
153

 
$
43

Adjustments to compute diluted earnings:
 
 
 
 
 
Noncontrolling interest adjustment
(2
)
 
—

 
—

Net income available to TDS common shareholders in diluted earnings per share
$
133

 
$
153

 
$
43

 
 
 
 
 
 
Weighted average number of shares used in basic earnings per share:
 
 
 
 
 
Common Shares
105

 
104

 
103

Series A Common Shares
7

 
7

 
7

Total
112

 
111

 
110

 
 
 
 
 
 
Effects of dilutive securities
2

 
1

 
1

Weighted average number of shares used in diluted earnings per share
114

 
112

 
111

 
 
 
 
 
 
Basic earnings per share available to TDS common shareholders
$
1.20

 
$
1.39

 
$
0.39

 
 
 
 
 
 
Diluted earnings per share available to TDS common shareholders
$
1.17

 
$
1.37

 
$
0.39