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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2016
 
2015
Numerator (basic and diluted):
 

 
 

Income from continuing operations
$
109

 
$
61

Less: Allocation to unvested restricted stock awards
1

 
1

Income from continuing operations attributable to common shareholders
108

 
60

 
 
 
 
Income from discontinued operations, net
—

 
3

Less: Allocation to unvested restricted stock awards
—

 
—

Income from discontinued operations attributable to common shareholders
—

 
3

 
 
 
 
Net income available to common shareholders
$
108

 
$
63

 
 
 
 
Denominator:
 

 
 

Basic common shares (based upon weighted average)
330

 
344

Add: Stock option dilution
3

 
3

Diluted common shares
333

 
347