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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2020
 
2019
(Dollars and shares in millions, except per share amounts)
 
 
 
Net income attributable to U.S. Cellular shareholders
$
71

 
$
54

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

 
86

Effects of dilutive securities
2

 
2

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

 
88

 
 
 
 
Basic earnings per share attributable to U.S. Cellular shareholders
$
0.82

 
$
0.63

 
 
 
 
Diluted earnings per share attributable to U.S. Cellular shareholders
$
0.81

 
$
0.62