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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings per share
The amounts used in computing basic and diluted earnings per share attributable to U.S. Cellular shareholders were as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
(Dollars and shares in millions, except per share amounts)
 
 
 
 
 
 
 
Net income attributable to U.S. Cellular shareholders
$
68

 
$
31

 
$
139

 
$
86

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

 
87

 
86

 
87

Effects of dilutive securities
1

 
1

 
1

 
1

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

 
88

 
87

 
88

 
 
 
 
 
 
 
 
Basic earnings per share attributable to U.S. Cellular shareholders
$
0.79

 
$
0.36

 
$
1.62

 
$
0.99

 
 
 
 
 
 
 
 
Diluted earnings per share attributable to U.S. Cellular shareholders
$
0.78

 
$
0.35

 
$
1.59

 
$
0.97