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Computation of Per Basic/Diluted Earnings Common Share (Tables)
 12 Months Ended
Dec. 31, 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 Years Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 

 
 

 
 

Consolidated net income
$
273

 
$
966

 
$
892

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

 
(2
)
 
(4
)
Less: Undistributed earnings allocated to unvested share-based awards that participate in earnings
—

 
(2
)
 
(7
)
Numerator for basic and diluted earnings per common share—income available to common shareholders
$
273

 
$
962

 
$
881

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

 
740

 
728

Effect of dilutive stock options and awards under the treasury stock method
12

 
14

 
11

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

 
754

 
739

Basic earnings per common share
$
0.36

 
$
1.30

 
$
1.21

Diluted earnings per common share
$
0.36

 
$
1.28

 
$
1.19