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Investment Information - Summary of available for sale securities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Fixed maturities: |  |  |
Estimated fair value | $ 35,051 | $ 29,819 |
Gross Unrealized Gains | 408 | 181 |
Gross Unrealized Losses | (290) | (694) |
Allowance for Expected Credit Losses | (20) | (22) |
Cost or Amortized Cost | 34,953 | 30,354 |
Fixed maturities available for sale, at fair value |  |  |
Fixed maturities: |  |  |
Estimated fair value | 32,426 | 27,035 |
Gross Unrealized Gains | 406 | 179 |
Gross Unrealized Losses | (289) | (692) |
Allowance for Expected Credit Losses | (20) | (22) | $ (28)
Cost or Amortized Cost | 32,329 | 27,570 |
Corporate bonds |  |  |
Fixed maturities: |  |  |
Estimated fair value | 14,058 | 12,487 |
Gross Unrealized Gains | 265 | 110 |
Gross Unrealized Losses | (142) | (346) |
Allowance for Expected Credit Losses | (10) | (12) |
Cost or Amortized Cost | 13,945 | 12,735 |
US government and government agencies |  |  |
Fixed maturities: |  |  |
Estimated fair value | 7,445 | 6,710 |
Gross Unrealized Gains | 23 | 8 |
Gross Unrealized Losses | (21) | (149) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 7,443 | 6,851 |
Asset backed securities |  |  |
Fixed maturities: |  |  |
Estimated fair value | 3,574 | 2,900 |
Gross Unrealized Gains | 20 | 19 |
Gross Unrealized Losses | (15) | (32) |
Allowance for Expected Credit Losses | (8) | (8) |
Cost or Amortized Cost | 3,577 | 2,921 |
Non-US government securities |  |  |
Fixed maturities: |  |  |
Estimated fair value | 3,270 | 2,538 |
Gross Unrealized Gains | 53 | 30 |
Gross Unrealized Losses | (81) | (107) |
Allowance for Expected Credit Losses | (1) | (1) | $ (1)
Cost or Amortized Cost | 3,299 | 2,616 |
Residential mortgage backed securities |  |  |
Fixed maturities: |  |  |
Estimated fair value | 2,705 | 1,079 |
Gross Unrealized Gains | 34 | 6 |
Gross Unrealized Losses | (21) | (31) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 2,692 | 1,104 |
Commercial mortgage backed securities |  |  |
Fixed maturities: |  |  |
Estimated fair value | 1,212 | 1,058 |
Gross Unrealized Gains | 11 | 6 |
Gross Unrealized Losses | (5) | (11) |
Allowance for Expected Credit Losses | (1) | (1) |
Cost or Amortized Cost | 1,207 | 1,064 |
Municipal bonds |  |  |
Fixed maturities: |  |  |
Estimated fair value | 162 | 263 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (4) | (16) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 166 | 279 |
Short-term investments |  |  |
Fixed maturities: |  |  |
Estimated fair value | 2,625 | 2,784 |
Gross Unrealized Gains | 2 | 2 |
Gross Unrealized Losses | (1) | (2) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | $ 2,624 | $ 2,784 |

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