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Investments (Other Invested Assets - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |
Carrying value of Tax Credits | $ 518 | $ 759 |
Losses From Tax Credits | $ 145 | $ 174 | $ 195

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