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Computation of Basic/Diluted Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 
 
 
  Consolidated net income
$
260

 
$
188

 
$
1,162

 
$
858

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Denominator for basic earnings per common share—weighted-average common shares outstanding
763

 
755

 
761

 
753

Effect of potential dilutive common shares under the treasury stock method—employee stock options and awards
8

 
11

 
10

 
11

Denominator for basic earnings per common share—weighted-average dilutive common shares outstanding
771

 
766

 
771

 
764

 
 
 
 
 
 
 
 
Basic earnings per common share
$
0.34

 
$
0.25

 
$
1.53

 
$
1.14

Diluted earnings per common share
$
0.34

 
$
0.25

 
$
1.51

 
$
1.12