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Income per Common Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Income per Common Share
Income (Loss) and Dividends per Common Share
Basic income (loss) per share is based on the weighted average number of common shares outstanding. Diluted income per share assumes exercise of stock options in all periods, provided the effect is not antidilutive. The per share calculations below exclude 6 million, 11 million and 13 million stock options in 2018, 2017 and 2016 that were antidilutive.
 
Year Ended December 31,
(In millions, except per share data)
2018
 
2017
 
2016
Income (loss) from continuing operations
$
1,096

 
$
(830
)
 
$
(2,087
)
Income (loss) from discontinued operations
—

 
(4,893
)
 
(53
)
Net income (loss)
$
1,096

 
$
(5,723
)
 
$
(2,140
)
 
 
 
 
 
 
Weighted average common shares outstanding
846

 
850

 
819

Effect of dilutive securities
1

 
—

 
—

Weighted average common shares, diluted
847

 
850

 
819

Per basic share:
 

 
 

 
 
Income (loss) from continuing operations
$
1.30

 
$
(0.97
)
 
$
(2.55
)
Income (loss) from discontinued operations
$
—

 
$
(5.76
)
 
$
(0.06
)
Net income (loss)
$
1.30

 
$
(6.73
)
 
$
(2.61
)
Per diluted share:
 
 
 
 
 
Income (loss) from continuing operations
$
1.29

 
$
(0.97
)
 
$
(2.55
)
Income (loss) from discontinued operations
$
—

 
$
(5.76
)
 
$
(0.06
)
Net income (loss)
$
1.29

 
$
(6.73
)
 
$
(2.61
)
Dividends per share
$
0.20

 
$
0.20

 
$
0.20