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Computation of Basic/Diluted Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per common 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,
 
2018
 
2017
 
2016
Numerator:
 

 
 

 
 

Consolidated net income
$
1,813

 
$
273

 
$
966

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
—

 
—

 
(2
)
Numerator for basic and diluted earnings per common share—income available to common shareholders
$
1,813

 
$
273

 
$
962

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Denominator for basic earnings per common share—weighted-average common shares outstanding
762

 
754

 
740

Effect of dilutive stock options and awards under the treasury stock method
9

 
12

 
14

Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method
771

 
766

 
754

Basic earnings per common share
$
2.38

 
$
0.36

 
$
1.30

Diluted earnings per common share
$
2.35

 
$
0.36

 
$
1.28