Net Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Summary of net earnings per share

Net earnings per share were computed as follows:

	Year ended December 31,
	2020		2019		2018
	(in millions, except per share amounts)
Net earnings attributable to common stockholders	$	317	$	493	$	290
Basic earnings per common share:
Weighted-average common shares outstanding	214.9		220.2		232.6
Net earnings attributable to common stockholders	$	1.48	$	2.24	$	1.25
Diluted earnings per common share:
Weighted-average common shares outstanding	214.9		220.2		232.6
Dilutive common shares—stock-based awards	0.3		1.4		1.2
Diluted weighted-average shares outstanding	215.2		221.6		233.8
Net earnings attributable to common stockholders	$	1.47	$	2.23	$	1.24