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Income (Loss) and Dividends per Common Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Income (Loss) and Dividends per Common Share Income and Dividends per Common Share
Basic income 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 and 5 million of stock options for the three and nine months ended September 30, 2019, and 5 million and 6 million of stock options for the three and nine months ended September 30, 2018, that were antidilutive.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions, except per share data)
2019
 
2018
 
2019
 
2018
Net income
$
165

 
$
254

 
$
500

 
$
706

 
 
 
 
 
 
 
 
Weighted average common shares outstanding
802

 
848

 
813

 
852

Effect of dilutive securities
1

 
1

 
—

 
1

Weighted average common shares, diluted
803

 
849

 
813

 
853

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.21

 
$
0.30

 
$
0.62

 
$
0.83

Diluted
$
0.21

 
$
0.30

 
$
0.62

 
$
0.83

 
 
 
 
 
 
 
 
Dividends per share
$
0.05

 
$
0.05

 
$
0.15

 
$
0.15