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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |  |  |  |
Stock-based compensation expense | $ 6 | $ 8 | $ 13 | $ 16
Stock-based compensation expense (net of tax) | $ 5 | $ 5 | $ 10 | $ 11

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