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Income (Loss) and Dividends per Common Share
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Income (Loss) and Dividends 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 (loss) per share assumes exercise of stock options in all periods, provided the effect is not antidilutive. The per share calculations below exclude 6 million and 5 million of stock options for the three months ended March 31, 2020 and 2019 that were antidilutive.
 
Three Months Ended March 31,
 
(In millions, except per share data)
2020
 
2019
 
Net income (loss)
$
(46
)
 
$
174

 
 
 
 
 
 
Weighted average common shares outstanding
794

 
819

 
Effect of dilutive securities
—

 
1

 
Weighted average common shares, diluted
794

 
820

 
Net income (loss) per share:
 
 
 
 
Basic
$
(0.06
)
 
$
0.21

 
Diluted
$
(0.06
)
 
$
0.21

 
 
 
 
 
 
Dividends per share
$
0.05

 
$
0.05