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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-Based Compensation [Abstract] |  |  |  |
Stock-based compensation expense | $ 4 | $ 2 | $ 13 | $ 7
Stock-based compensation expense, net of tax | 4 | $ 2 | 11 | $ 5
Total unrecognized compensation costs related to non-vested stock options, restricted share units and performance shares | $ 36 |  | $ 36 |
Weighted-average period of recognition of stock-based compensation cost |  |  | 2 years 6 months 10 days |

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