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Investment Information - Summary of available for sale securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Available for sale securities: |  |  |
Estimated fair value | $ 25,616 | $ 21,015 |
Gross Unrealized Gains | 276 | 90 |
Gross Unrealized Losses | (827) | (1,649) |
Allowance for Expected Credit Losses | (28) | (41) |
Cost or Amortized Cost | 26,195 | 22,615 |
Fixed maturities available for sale, at fair value |  |  |
Available for sale securities: |  |  |
Estimated fair value | 23,553 | 19,683 |
Gross Unrealized Gains | 275 | 89 |
Gross Unrealized Losses | (825) | (1,647) |
Allowance for Expected Credit Losses | (28) | (41) | $ (3)
Cost or Amortized Cost | 24,131 | 21,282 |
Corporate bonds |  |  |
Available for sale securities: |  |  |
Estimated fair value | 10,855 | 8,020 |
Gross Unrealized Gains | 157 | 55 |
Gross Unrealized Losses | (464) | (781) |
Allowance for Expected Credit Losses | (20) | (30) |
Cost or Amortized Cost | 11,182 | 8,776 |
US government and government agencies |  |  |
Available for sale securities: |  |  |
Estimated fair value | 5,814 | 5,162 |
Gross Unrealized Gains | 63 | 15 |
Gross Unrealized Losses | (86) | (343) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 5,837 | 5,490 |
Asset backed securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 2,250 | 1,927 |
Gross Unrealized Gains | 11 | 1 |
Gross Unrealized Losses | (55) | (107) |
Allowance for Expected Credit Losses | (5) | (6) |
Cost or Amortized Cost | 2,299 | 2,039 |
Non-US government securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 2,062 | 2,313 |
Gross Unrealized Gains | 33 | 9 |
Gross Unrealized Losses | (100) | (238) |
Allowance for Expected Credit Losses | (1) | (2) | $ 0
Cost or Amortized Cost | 2,130 | 2,544 |
Commercial mortgage backed securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 1,213 | 1,047 |
Gross Unrealized Gains | 3 | 1 |
Gross Unrealized Losses | (34) | (58) |
Allowance for Expected Credit Losses | (2) | (3) |
Cost or Amortized Cost | 1,246 | 1,107 |
Mortgage backed securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 1,103 | 795 |
Gross Unrealized Gains | 7 | 5 |
Gross Unrealized Losses | (66) | (87) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 1,162 | 877 |
Municipal bonds |  |  |
Available for sale securities: |  |  |
Estimated fair value | 256 | 419 |
Gross Unrealized Gains | 1 | 3 |
Gross Unrealized Losses | (20) | (33) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 275 | 449 |
Short-term investments |  |  |
Available for sale securities: |  |  |
Estimated fair value | 2,063 | 1,332 |
Gross Unrealized Gains | 1 | 1 |
Gross Unrealized Losses | (2) | (2) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | $ 2,064 | $ 1,333 |

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