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Computation of Basic/Diluted Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 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 September 30,
 
For the Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 

 
 

 
 
 
 
Consolidated net income
$
188

 
$
199

 
$
858

 
$
713

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
)
 
—

 
(2
)
Numerator for basic and diluted earnings per common share—income available to common shareholders
$
188

 
$
198

 
$
858

 
$
709

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Denominator for basic earnings per common share—weighted-average common shares outstanding
755

 
742

 
753

 
739

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

 
14

 
11

 
14

Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method
766

 
756

 
764

 
753

Basic earnings per common share
$
0.25

 
$
0.27

 
$
1.14

 
$
0.96

Diluted earnings per common share
$
0.25

 
$
0.26

 
$
1.12

 
$
0.94