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Investments in fixed maturity securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of investments in securities with fixed maturities | Investments in fixed maturity securities are summarized by type below (in millions).
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, U.S. government corporations and agencies | $ | 4,447 |  |  | $ | 16 |  |  | $ | (4 | ) |  | $ | 4,459 |
Foreign governments |  | 9,443 |  |  |  | 16 |  |  |  | (97 | ) |  |  | 9,362 |
Corporate and other |  | 1,324 |  |  |  | 225 |  |  |  | (6 | ) |  |  | 1,543 |
| $ | 15,214 |  |  | $ | 257 |  |  | $ | (107 | ) |  | $ | 15,364 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, U.S. government corporations and agencies | $ | 10,308 |  |  | $ | 14 |  |  | $ | (53 | ) |  | $ | 10,269 |
Foreign governments |  | 11,788 |  |  |  | 58 |  |  |  | (41 | ) |  |  | 11,805 |
Corporate and other |  | 1,429 |  |  |  | 262 |  |  |  | (7 | ) |  |  | 1,684 |
| $ | 23,525 |  |  | $ | 334 |  |  | $ | (101 | ) |  | $ | 23,758 |
Schedule of amortized cost and estimated fair value of securities with fixed maturities |
| Due in one year or less |  |  | Due after one year through five years |  |  | Due after five years through ten years |  |  | Due after ten years |  |  | Mortgage-backed securities |  |  | Total |
Amortized cost | $ | 10,228 |  |  | $ | 4,202 |  |  | $ | 532 |  |  | $ | 123 |  |  | $ | 129 |  |  | $ | 15,214 |
Fair value |  | 10,107 |  |  |  | 4,267 |  |  |  | 718 |  |  |  | 133 |  |  |  | 139 |  |  |  | 15,364 |

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