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Computation of Basic/Diluted Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of computation of earnings per share
The following table sets forth the computation of basic and diluted earnings per common share (amounts in millions, except per share data):
 
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Numerator:
 

 
 

 
 
 
 
Consolidated net income
$
212

 
$
204

 
$
606

 
$
497

Less: Distributed earnings to unvested stock-based awards that participate in earnings
—

 
—

 
(4
)
 
(5
)
Less: Undistributed earnings allocated to unvested stock-based awards that participate in earnings
(2
)
 
(4
)
 
(5
)
 
(8
)
Numerator for basic and diluted earnings per common share — income available to common shareholders
$
210

 
$
200

 
$
597

 
$
484

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Denominator for basic earnings per common share - weighted-average common shares outstanding
727

 
716

 
725

 
712

Effect of potential dilutive common shares under the treasury stock method:
 
 
 
 
 
 
 
Employee stock options and awards
8

 
9

 
9

 
11

Denominator for diluted earnings per common share - weighted-average common shares outstanding plus dilutive common shares under the treasury stock method
735

 
725

 
734

 
723

 
 
 
 
 
 
 
 
Basic earnings per common share
$
0.29

 
$
0.28

 
$
0.82

 
$
0.68

 
 
 
 
 
 
 
 
Diluted earnings per common share
$
0.29

 
$
0.28

 
$
0.81

 
$
0.67