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Net Income Per Common Share (Tables)
 12 Months Ended
Dec. 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)
 
Years ended December 31,
 
2019
 
2018
 
2017
Numerator:
 
 

 
 

 
 

Net income—basic and diluted
 
$
1,997

 
$
287

 
$
1,045

Denominator:
 
 

 
 

 
 

Basic weighted-average common shares outstanding
 
163.2

 
163.2

 
164.2

Effect of share-based awards:
 
 

 
 

 
 

Stock options
 
1.2

 
0.8

 
1.1

Nonvested shares
 
0.7

 
0.5

 
0.7

Diluted weighted-average shares
 
165.1

 
164.5

 
166.0

Earnings per share:
 
 

 
 

 
 

Basic
 
$
12.24

 
$
1.76

 
$
6.36

Diluted
 
12.10

 
1.75

 
6.29

Number of anti-dilutive share-based awards
 
—

 
1.3

 
0.7