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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Numerator (basic and diluted):
 

 
 

 
 

 
 

Income from continuing operations
$
134

 
$
111

 
$
393

 
$
281

Less: Allocation to unvested restricted stock awards
2

 
2

 
5

 
4

Income from continuing operations attributable to common shareholders
132

 
109

 
388

 
277

 
 
 
 
 
 
 
 
Loss from discontinued operations, net
—

 
—

 
—

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

 
—

 
—

 
—

Loss from discontinued operations attributable to common shareholders
—

 
—

 
—

 
(1
)
 
 
 
 
 
 
 
 
Net income available to common shareholders
$
132

 
$
109

 
$
388

 
$
276

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Basic common shares (based upon weighted average)
326

 
335

 
328

 
340

Add: Stock option dilution
3

 
3

 
4

 
4

Diluted common shares
329

 
338

 
332

 
344