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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Stock-Based Compensation [Abstract] |  |  |  |
Stock-based compensation expense | $ 8 | $ 6 | $ 13 | $ 12
Stock-based compensation expense, net of tax | 7 | $ 4 | 11 | $ 10
Total unrecognized compensation costs related to non-vested stock options, restricted share units and performance shares | $ 49 |  | $ 49 |
Weighted-average period of recognition of stock-based compensation cost |  |  | 2 years 11 months 12 days |

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