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Earnings (Loss) Per Common Share Level 1 (Notes)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
The following table presents the computation of basic and diluted earnings per common share.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In millions, except for per share data)
2016
2015
 
2016
2015
Earnings
 
 
 
 
 
Net income
$
216

$
413

 
$
539

$
880

Shares
 
 
 
 
 
Weighted average common shares outstanding, basic
391.8

418.7

 
395.2

420.6

Dilutive effect of stock compensation plans
3.2

4.4

 
3.6

5.0

Dilutive effect of warrants
3.6

5.0

 
3.6

5.3

Weighted average common shares outstanding and dilutive potential common shares
398.6

428.1

 
402.4

430.9

Net income per common share
 
 
 
 
 
Basic
$
0.55

$
0.99

 
$
1.36

$
2.09

Diluted
$
0.54

$
0.96

 
$
1.34

$
2.04