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Net Income Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2020
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,
 
2020
 
2019
Numerator:
 
 

 
 

Net income (loss)—basic and diluted
 
$
(1,226
)
 
$
695

Denominator:
 
 

 
 

Basic weighted-average common shares outstanding
 
162.2

 
163.0

Effect of share-based awards:
 
 

 
 

Stock options
 
—

 
0.9

Nonvested shares
 
—

 
0.7

Diluted weighted-average shares
 
162.2

 
164.6

Earnings (loss) per share:
 
 

 
 

Basic
 
$
(7.56
)
 
$
4.27

Diluted
 
$
(7.56
)
 
$
4.22

Number of anti-dilutive share-based awards
 
2.5

 
0.7