Net Income Per Common Share (Tables)

12 Months Ended

Dec. 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)	Years ended December 31,
	2020		2019		2018
Numerator:
Net income—basic and diluted	$	1,216	$	1,997	$	287
Denominator:
Basic weighted-average common shares outstanding	161.2		163.2		163.2
Effect of share-based awards:
Stock options	0.7		1.2		0.8
Nonvested shares	0.5		0.7		0.5
Diluted weighted-average shares	162.4		165.1		164.5
Earnings per share:
Basic	$	7.55	$	12.24	$	1.76
Diluted	7.49		12.10		1.75
Number of anti-dilutive share-based awards	1.4		—		1.3