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Earnings Per Common Share
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Common Share
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)
2018
2017
 
2018
2017
Earnings
 
 
 
 
 
Income (loss) from continuing operations, net of tax
$
434

$
(152
)
 
$
862

$
151

Income from discontinued operations, net of tax
148

112

 
317

187

Net income (loss)
$
582

$
(40
)
 
$
1,179

$
338

Shares
 
 
 
 
 
Weighted average common shares outstanding, basic
358.3

366.0

 
357.9

368.7

Dilutive effect of stock compensation plans
4.0

—

 
4.2

4.0

Dilutive effect of warrants
1.9

—

 
2.0

2.8

Weighted average common shares outstanding and dilutive potential common shares
364.2

366.0

 
364.1

375.5

Net income per common share
 
 
 
 
 
Basic
 
 
 
 
 
Income (loss) from continuing operations, net of tax
$
1.21

$
(0.42
)
 
$
2.41

$
0.41

Income from discontinued operations, net of tax
$
0.41

$
0.31

 
$
0.88

$
0.51

Net income (loss) per common share
$
1.62

$
(0.11
)
 
$
3.29

$
0.92

Diluted
 
 
 
 
 
Income (loss) from continuing operations, net of tax
$
1.19

$
(0.42
)
 
$
2.37

$
0.40

Income from discontinued operations, net of tax
$
0.41

$
0.31

 
$
0.87

$
0.50

Net income (loss) per common share
$
1.60

$
(0.11
)
 
$
3.24

$
0.90


As a result of the net loss from continuing operations for the three months ended June 30, 2017, the Company was required to use basic weighted average common shares outstanding in the calculation of diluted loss per share, since the inclusion of 3.8 million shares for stock compensation plans and 2.5 million shares for warrants would have been antidilutive to the earnings (loss) per share calculation. In the absence of the net loss, weighted average common shares outstanding and dilutive potential common shares would have totaled 372.3 million.