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Stock-based Compensation (Summary of Restricted Stock Awards Vested) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement, Noncash Expense [Abstract] |  |  |
Total shares vested | 1.0 | 1.0 | 1.0
Fair value on vesting date | $ 92 | $ 187 | $ 199

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