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Investments (Narrative) (Details) $ in Billions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) security | Sep. 30, 2022 USD ($) | Dec. 31, 2022 security
Investments [Abstract] |  |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 98.00% |  | 98.00%
Number of securities in unrealized loss position | security | 4,059 |  | 4,510
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 98.00% |  | 98.00%
Proceeds from sales of available for sale fixed maturity securities | $ 9.0 | $ 3.2 |
Principal repayments, calls and tenders for available for sale fixed maturity securities | $ 1.4 | $ 2.0 |

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