Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six months ended June 30,
	2020		2019		2020		2019
Numerator:
Net income (loss)—basic and diluted	$	909	$	428	$	(317)	$	1,123
Denominator:
Basic weighted-average common shares outstanding	160.8		163.3		161.5		163.1
Effect of share-based awards:
Stock options	0.3		1.2		—		1.1
Nonvested shares	0.4		0.7		—		0.7
Diluted weighted-average shares	161.5		165.2		161.5		164.9
Earnings (loss) per share:
Basic	$	5.65	$	2.62	$	(1.96)	$	6.89
Diluted	$	5.63	$	2.59	$	(1.96)	$	6.81
Number of anti-dilutive share-based awards	2.7		0.4		2.6		0.7