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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings per share
The amounts used in computing earnings (loss) per common share and the effects of potentially dilutive securities on the weighted average number of common shares were as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
(Dollars and shares in millions, except per share amounts)
 

 
 

 
 

 
 
Basic earnings (loss) per share available to TDS common shareholders:
 

 
 

 
 

 
 
Net income (loss) available to TDS common shareholders used in basic earnings (loss) per share
$
46

 
$
(181
)
 
$
119

 
$
(134
)
Adjustments to compute diluted earnings (loss):
 
 
 
 
 
 
 
Noncontrolling interest adjustment
—

 
—

 
(2
)
 
—

Net income (loss) available to TDS common shareholders used in diluted earnings (loss) per share
$
46

 
$
(181
)
 
$
117

 
$
(134
)
 
 
 
 
 
 
 
 
Weighted average number of shares used in basic earnings (loss) per share:
 
 
 
 
 
 
 
Common Shares
105

 
104

 
105

 
104

Series A Common Shares
7

 
7

 
7

 
7

Total
112

 
111

 
112

 
111

 
 
 
 
 
 
 
 
Effects of dilutive securities
2

 
—

 
1

 
—

Weighted average number of shares used in diluted earnings (loss) per share
114

 
111

 
113

 
111

 
 
 
 
 
 
 
 
Basic earnings (loss) per share available to TDS common shareholders
$
0.41

 
$
(1.64
)
 
$
1.06

 
$
(1.21
)
 
 
 
 
 
 
 
 
Diluted earnings (loss) per share available to TDS common shareholders
$
0.41

 
$
(1.64
)
 
$
1.04

 
$
(1.21
)