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Earnings per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per common share
Computation of basic and diluted earnings per common share
 
 
 
 
($ in millions, except per share data)
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
870

 
$
666

 
$
2,521

 
$
1,940

Less: Preferred stock dividends
 
37

 
29

 
105

 
87

Net income applicable to common shareholders (1)
 
$
833

 
$
637

 
$
2,416

 
$
1,853

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
346.0

 
361.3

 
349.7

 
363.5

Effect of dilutive potential common shares:
 
 
 
 
 
 
 
 
Stock options
 
3.8

 
4.4

 
3.8

 
4.3

Restricted stock units (non-participating) and performance stock awards
 
1.9

 
1.4

 
1.9

 
1.3

Weighted average common and dilutive potential common shares outstanding
 
351.7

 
367.1

 
355.4

 
369.1

 
 
 
 
 
 
 
 
 
Earnings per common share - Basic
 
$
2.41

 
$
1.76

 
$
6.91

 
$
5.10

Earnings per common share - Diluted
 
$
2.37

 
$
1.74

 
$
6.80

 
$
5.02

(1) 
Net income applicable to common shareholders is net income less preferred stock dividends.