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Investments in fixed maturity securities | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Investments in fixed maturity securities | (3) Investments in fixed maturity securities Investments in fixed maturity securities are summarized by type below (in millions).
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
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 bonds |  | 1,212 |  |  |  | 241 |  |  |  | (4 | ) |  |  | 1,449 |
Other |  | 217 |  |  |  | 21 |  |  |  | (3 | ) |  |  | 235 |
| $ | 23,525 |  |  | $ | 334 |  |  | $ | (101 | ) |  | $ | 23,758 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, U.S. government corporations and agencies | $ | 10,039 |  |  | $ | 12 |  |  | $ | (249 | ) |  | $ | 9,802 |
Foreign governments |  | 10,454 |  |  |  | 50 |  |  |  | (177 | ) |  |  | 10,327 |
Corporate bonds |  | 1,945 |  |  |  | 256 |  |  |  | (6 | ) |  |  | 2,195 |
Other |  | 2,735 |  |  |  | 77 |  |  |  | (8 | ) |  |  | 2,804 |
| $ | 25,173 |  |  | $ | 395 |  |  | $ | (440 | ) |  | $ | 25,128 |
Approximately 95% of our foreign government holdings were rated AA or higher by at least one of the major rating agencies as of December 31, 2023. The amortized cost and estimated fair value of fixed maturity securities at December 31, 2023 are summarized below by contractual maturity dates (in millions). Actual maturities may differ from contractual maturities due to prepayment rights held by issuers.
| 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 | $ | 18,888 |  |  | $ | 3,744 |  |  | $ | 611 |  |  | $ | 128 |  |  | $ | 154 |  |  | $ | 23,525 |
Fair value |  | 18,875 |  |  |  | 3,754 |  |  |  | 823 |  |  |  | 138 |  |  |  | 168 |  |  |  | 23,758 |

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