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Stock-Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (costs of sales and general and administrative) $ 2,000,000 $ 3,000,000 $ 5,000,000 $ 5,000,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 0 (1,000,000) (1,000,000) (3,000,000)
Impact on cash flow due to taxes paid related to net share settlement of equity awards $ 0 $ 2,000,000 $ 4,000,000 $ 8,000,000