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Computation of Basic/Diluted Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Numerator:
 

 
 

 
 
 
 
Consolidated net income
$
127

 
$
212

 
$
463

 
$
606

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

 
—

 
(2
)
 
(4
)
Less: Undistributed earnings allocated to unvested stock-based awards that participate in earnings
(1
)
 
(2
)
 
(1
)
 
(5
)
Numerator for basic and diluted earnings per common share — income available to common shareholders
$
126

 
$
210

 
$
460

 
$
597

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Denominator for basic earnings per common share - weighted-average common shares outstanding
739

 
727

 
737

 
725

Effect of potential dilutive common shares under the treasury stock method:
 
 
 
 
 
 
 
Employee stock options and awards
11

 
8

 
11

 
9

Denominator for diluted earnings per common share - weighted-average common shares outstanding plus dilutive common shares under the treasury stock method
750

 
735

 
748

 
734

 
 
 
 
 
 
 
 
Basic earnings per common share
$
0.17

 
$
0.29

 
$
0.62

 
$
0.82

 
 
 
 
 
 
 
 
Diluted earnings per common share
$
0.17

 
$
0.29

 
$
0.61

 
$
0.81