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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share
Reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share were as follows, in millions: 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Numerator (basic and diluted):
 

 
 

 
 

 
 

Income from continuing operations
$
150

 
$
109

 
$
259

 
$
170

Less: Allocation to unvested restricted stock awards
2

 
1

 
3

 
2

Income from continuing operations attributable to common shareholders
148

 
108

 
256

 
168

 
 
 
 
 
 
 
 
Loss from discontinued operations, net
—

 
(4
)
 
—

 
(1
)
Less: Allocation to unvested restricted stock awards
—

 
—

 
—

 
—

Loss from discontinued operations attributable to common shareholders
—

 
(4
)
 
—

 
(1
)
 
 
 
 
 
 
 
 
Net income available to common shareholders
$
148

 
$
104

 
$
256

 
$
167

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Basic common shares (based upon weighted average)
328

 
340

 
329

 
342

Add: Stock option dilution
3

 
4

 
4

 
4

Diluted common shares
331

 
344

 
333

 
346