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Earnings Per Share
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share
Note 5 Earnings Per Share
Basic earnings per share attributable to TDS shareholders is computed by dividing Net income attributable to TDS shareholders by the weighted average number of Common Shares outstanding during the period. Diluted earnings per share attributable to TDS shareholders is computed by dividing Net income attributable to TDS shareholders by the weighted average number of Common Shares outstanding during the period adjusted to include the effects of potentially dilutive securities. Potentially dilutive securities primarily include incremental shares issuable upon the exercise of outstanding stock options and the vesting of performance and restricted stock units.
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:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
(Dollars and shares in millions, except per share amounts)
 

 
 

 
 

 
 
Basic earnings per share attributable to TDS shareholders:
 

 
 

 
 

 
 
Net income attributable to TDS shareholders used in basic earnings per share
$
33

 
$
33

 
$
92

 
$
72

Adjustments to compute diluted earnings:
 
 
 
 
 
 
 
Noncontrolling interest adjustment
(1
)
 
(1
)
 
(1
)
 
(1
)
Net income attributable to TDS shareholders used in diluted earnings per share
$
32

 
$
32

 
$
91

 
$
71

 
 
 
 
 
 
 
 
Weighted average number of shares used in basic earnings per share:
 
 
 
 
 
 
 
Common Shares
107

 
105

 
107

 
105

Series A Common Shares
7

 
7

 
7

 
7

Total
114

 
112

 
114

 
112

 
 
 
 
 
 
 
 
Effects of dilutive securities
2

 
1

 
2

 
1

Weighted average number of shares used in diluted earnings per share
116

 
113

 
116

 
113

 
 
 
 
 
 
 
 
Basic earnings per share attributable to TDS shareholders
$
0.29

 
$
0.30

 
$
0.81

 
$
0.65

 
 
 
 
 
 
 
 
Diluted earnings per share attributable to TDS shareholders
$
0.28

 
$
0.29

 
$
0.78

 
$
0.63


Certain Common Shares issuable upon the exercise of stock options or vesting of performance and restricted stock units were not included in average diluted shares outstanding for the calculation of Diluted earnings per share attributable to TDS shareholders because their effects were antidilutive. The number of such Common Shares excluded was less than 1 million for both the three and six months ended June 30, 2019, and 3 million and 4 million for the three and six months ended June 30, 2018, respectively.