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Earnings (Loss) Per Common Share Level 1 (Notes)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Computation of Basic and Diluted Earnings per Common Share
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions, except for per share data)
2017
2016
 
2017
2016
Earnings
 
 
 
 
 
Net income
$
234

$
438

 
$
572

$
977

Shares
 
 
 
 
 
Weighted average common shares outstanding, basic
360.2

383.8

 
365.9

391.4

Dilutive effect of stock compensation plans
4.5

3.2

 
4.1

3.5

Dilutive effect of warrants
2.3

3.5

 
2.6

3.6

Weighted average common shares outstanding and dilutive potential common shares
367.0

390.5

 
372.6

398.5

Net income per common share
 
 
 
 
 
Basic
$
0.65

$
1.14

 
$
1.56

$
2.50

Diluted
$
0.64

$
1.12

 
$
1.54

$
2.45