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Computation of Per Basic/Diluted Earnings Common Share (Tables)
 12 Months Ended
Dec. 31, 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 Years Ended December 31,
 
2016
 
2015
 
2014
Numerator:
 

 
 

 
 

Consolidated net income
$
966

 
$
892

 
$
835

Less: Distributed earnings to unvested share-based awards that participate in earnings
(2
)
 
(4
)
 
(4
)
Less: Undistributed earnings allocated to unvested share-based awards that participate in earnings
(2
)
 
(7
)
 
(14
)
Numerator for basic and diluted earnings per common share—income available to common shareholders
$
962

 
$
881

 
$
817

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Denominator for basic earnings per common share—weighted-average common shares outstanding
740

 
728

 
716

Effect of potential dilutive common shares under the treasury stock method:
 
 
 
 
 
Employee stock options and awards
14

 
11

 
10

Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method
754

 
739

 
726

Basic earnings per common share
$
1.30

 
$
1.21

 
$
1.14

Diluted earnings per common share
$
1.28

 
$
1.19

 
$
1.13