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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
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:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
(Dollars and shares in millions, except per share amounts)
 
 
 
 
 
 
 
Net income attributable to U.S. Cellular shareholders
$
31

 
$
49

 
$
86

 
$
93

 
 
 
 
 
 
 
 
Weighted average number of shares used in basic earnings per share
87

 
86

 
87

 
85

Effects of dilutive securities
1

 
—

 
1

 
1

Weighted average number of shares used in diluted earnings per share
88

 
86

 
88

 
86

 
 
 
 
 
 
 
 
Basic earnings per share attributable to U.S. Cellular shareholders
$
0.36

 
$
0.57

 
$
0.99

 
$
1.09

 
 
 
 
 
 
 
 
Diluted earnings per share attributable to U.S. Cellular shareholders
$
0.35

 
$
0.56

 
$
0.97

 
$
1.08