Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018		2017		2016
Numerator:
Net income—basic and diluted	$	287	$	1,045	$	591
Denominator:
Basic weighted-average common shares outstanding	163.2		164.2		164.5
Effect of share-based awards:
Stock options	0.8		1.1		1.1
Nonvested shares	0.5		0.7		0.9
Diluted weighted-average shares	164.5		166.0		166.5
Earnings per share:
Basic	$	1.76	$	6.36	$	3.59
Diluted	1.75		6.29		3.55
Number of anti-dilutive share-based awards	1.3		0.7		0.3