Stock-Based Compensation (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	2.9		2.9
Total stock-based compensation expense (costs of sales and general and administrative)	$ 2,000,000	$ 2,000,000	$ 6,000,000	$ 7,000,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	(0)	(0)	(1,000,000)	(3,000,000)
Payment, Tax Withholding, Share-based Payment Arrangement	$ 2,000,000	$ 2,000,000	$ 5,000,000	$ 9,000,000
Shares available for grant, Employee Stock Purchase Plan	1.9		1.9