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Computation of Basic/Diluted Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Numerator:
 

 
 

 
 
 
 
Consolidated net income
$
243

 
$
151

 
$
669

 
$
514

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

 
—

 
—

 
(2
)
Less: Undistributed earnings allocated to unvested share-based awards that participate in earnings
—

 
(1
)
 
—

 
(1
)
Numerator for basic and diluted earnings per common share—income available to common shareholders
$
243

 
$
150

 
$
669

 
$
511

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Denominator for basic earnings per common share—weighted-average common shares outstanding
754

 
739

 
752

 
737

Effect of potential dilutive common shares under the treasury stock method:
 
 
 
 
 
 
 
Employee stock options and awards
10

 
14

 
11

 
14

Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method
764

 
753

 
763

 
751

Basic earnings per common share
$
0.32

 
$
0.20

 
$
0.89

 
$
0.69

Diluted earnings per common share
$
0.32

 
$
0.20

 
$
0.88

 
$
0.68