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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings (Loss) Per Common Share
Computation of Basic and Diluted Earnings per Common Share
 
For the years ended December 31,
(In millions, except for per share data)
2017
2016
2015
Earnings
 
 
 
(Loss) income from continuing operations, net of tax
$
(262
)
$
613

$
1,189

(Loss) income from discontinued operations, net of tax
(2,869
)
283

493

Net (loss) income
$
(3,131
)
$
896

$
1,682

Shares
 

 

 

Weighted average common shares outstanding, basic
363.7

387.7

415.5

Dilutive effect of warrants
—

3.6

4.7

Dilutive effect of stock-based awards under compensation plans
—

3.5

5.0

Weighted average shares outstanding and dilutive potential common shares [1]
363.7

394.8

425.2

Net income per common share
 
 
 
Basic
 
 
 
(Loss) income from continuing operations, net of tax
$
(0.72
)
$
1.58

$
2.86

(Loss) income from discontinued operations, net of tax
(7.89
)
0.73

1.19

Net income per common share
$
(8.61
)
$
2.31

$
4.05

Diluted
 

 

 

(Loss) income from continuing operations, net of tax
$
(0.72
)
$
1.55

$
2.80

(Loss) income from discontinued operations, net of tax
(7.89
)
0.72

1.16

Net (loss) income per common share
$
(8.61
)
$
2.27

$
3.96


[1]
For additional information, see Note 15 - Equity and Note 19 - Stock Compensation Plans of Notes to Consolidated Financial Statements.