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v3.23.1

Investment Information - Summary of available for sale securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | $ 22,245 | $ 21,015 |  |
Gross Unrealized Gains | 124 | 90 |  |
Gross Unrealized Losses | (1,298) | (1,649) |  |
Allowance for Expected Credit Losses | (56) | (41) |  |
Cost or Amortized Cost | 23,475 | 22,615 |  |
Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 20,692 | 19,683 |  |
Gross Unrealized Gains | 123 | 89 |  |
Gross Unrealized Losses | (1,297) | (1,647) |  |
Allowance for Expected Credit Losses | (56) | (41) | $ (34) | $ (3)
Cost or Amortized Cost | 21,922 | 21,282 |  |
Short-term investments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 1,553 | 1,332 |  |
Gross Unrealized Gains | 1 | 1 |  |
Gross Unrealized Losses | (1) | (2) |  |
Allowance for Expected Credit Losses | 0 | 0 |  |
Cost or Amortized Cost | 1,553 | 1,333 |  |
Corporate bonds | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 9,409 | 8,020 |  |
Gross Unrealized Gains | 84 | 55 |  |
Gross Unrealized Losses | (636) | (781) |  |
Allowance for Expected Credit Losses | (45) | (30) | (27) | (2)
Cost or Amortized Cost | 10,006 | 8,776 |  |
Residential mortgage backed securities | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 823 | 795 |  |
Gross Unrealized Gains | 6 | 5 |  |
Gross Unrealized Losses | (74) | (87) |  |
Allowance for Expected Credit Losses | 0 | 0 |  |
Cost or Amortized Cost | 891 | 877 |  |
Municipal bonds | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 314 | 419 |  |
Gross Unrealized Gains | 2 | 3 |  |
Gross Unrealized Losses | (24) | (33) |  |
Allowance for Expected Credit Losses | 0 | 0 |  |
Cost or Amortized Cost | 336 | 449 |  |
Commercial mortgage backed securities | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 1,035 | 1,047 |  |
Gross Unrealized Gains | 1 | 1 |  |
Gross Unrealized Losses | (54) | (58) |  |
Allowance for Expected Credit Losses | (2) | (3) |  |
Cost or Amortized Cost | 1,090 | 1,107 |  |
U.S. government and government agencies | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 4,563 | 5,162 |  |
Gross Unrealized Gains | 14 | 15 |  |
Gross Unrealized Losses | (234) | (343) |  |
Allowance for Expected Credit Losses | 0 | 0 |  |
Cost or Amortized Cost | 4,783 | 5,490 |  |
Non-U.S. government securities | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 2,187 | 2,313 |  |
Gross Unrealized Gains | 13 | 9 |  |
Gross Unrealized Losses | (178) | (238) |  |
Allowance for Expected Credit Losses | (3) | (2) | $ 0 | $ 0
Cost or Amortized Cost | 2,355 | 2,544 |  |
Asset backed securities | Fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | 2,361 | 1,927 |  |
Gross Unrealized Gains | 3 | 1 |  |
Gross Unrealized Losses | (97) | (107) |  |
Allowance for Expected Credit Losses | (6) | (6) |  |
Cost or Amortized Cost | $ 2,461 | $ 2,039 |  |

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