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Income (Loss) and Dividends per Common Share
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Income (Loss) and Dividends per Common Share Income 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 5 million and 8 million of stock options for the three months ended March 31, 2019 and 2018 that were antidilutive.
 
Three Months Ended March 31,
(In millions, except per share data)
2019
 
2018
Net income
$
174

 
$
356

 
 
 
 
Weighted average common shares outstanding
819

 
851

Effect of dilutive securities
1

 
1

Weighted average common shares, diluted
820

 
852

Net income per share:
 
 
 
Basic
$
0.21

 
$
0.42

Diluted
$
0.21

 
$
0.42

 
 
 
 
Dividends per share
$
0.05

 
$
0.05