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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)
 
 
 
 
 
Net income attributable to U.S. Cellular shareholders
$
150

 
$
12

 
$
48

 
 
 
 
 
 
Weighted average number of shares used in basic earnings per share
86

 
85

 
85

Effects of dilutive securities
1

 
1

 
—

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

 
86

 
85

 
 
 
 
 
 
Basic earnings per share attributable to U.S. Cellular shareholders
$
1.75

 
$
0.14

 
$
0.56

 
 
 
 
 
 
Diluted earnings per share attributable to U.S. Cellular shareholders
$
1.72

 
$
0.14

 
$
0.56