Earnings per Share (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average common shares outstanding - basic	112,000,000	131,000,000
Dilutive effect of employee stock plans	1,000,000	1,000,000
Shares used for diluted earnings per share	113,000,000	132,000,000
Net income per share - basic	$ 0.29	$ 0.20
Net income per share - diluted	$ 0.29	$ 0.20