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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share of Common Stock
The following table sets forth the computation of basic and diluted earnings per share of common stock:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(Dollars in millions, except share data)
Net income
$
61

 
$
50

 
$
97

 
$
85

Weighted Average Shares
 
 
 
 
 
 
 
Weighted average common shares outstanding
56,446,077

 
57,491,714

 
56,670,690

 
57,424,557

Effect of dilutive securities
 
 
 
 
 
 
 
Stock-based awards
615,745

 
766,863

 
651,823

 
861,770

Weighted average diluted common shares
57,061,822

 
58,258,577

 
57,322,513

 
58,286,327

Earnings per common share
 
 
 
 
 
 
 
Basic earnings per common share
$
1.08

 
$
0.86

 
$
1.71

 
$
1.47

Effect of dilutive securities
 
 
 
 
 
 
 
Stock-based awards
(0.02
)
 
(0.01
)
 
(0.02
)
 
(0.02
)
Diluted earnings per common share
$
1.06

 
$
0.85

 
$
1.69

 
$
1.45