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Stock-Based Compensation - Expense for performance based shares units (Details) - Performance Shares - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | $ 5 | $ 5 | $ 8 | $ 8
Total Stockholder Return |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | 1 | 2 | 4 | 5
Relative Revenue Growth |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | 4 | 3 | 3 | 3
Adjusted Earnings Per Share |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | $ 0 | $ 0 | $ 1 | $ 0

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