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Net Income Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Calculations For Basic And Diluted Earnings Per Share
The table shows calculations for basic and diluted earnings per share:
(In millions, except per share data)
 
Three months ended March 31,
 
2019
 
2018
Numerator:
 
 

 
 

Net income (loss)—basic and diluted
 
$
695

 
$
(31
)
Denominator:
 
 

 
 

Basic weighted-average common shares outstanding
 
163.0

 
164.0

Effect of share-based awards:
 
 

 
 

Stock options
 
0.9

 
—

Nonvested shares
 
0.7

 
—

Diluted weighted-average shares
 
164.6

 
164.0

Earnings per share:
 
 

 
 

Basic
 
$
4.27

 
$
(0.19
)
Diluted
 
$
4.22

 
$
(0.19
)
Number of anti-dilutive share-based awards
 
0.7

 
2.8