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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | $ 10,687 | $ 10,752 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 34 | 12 | $ 11 | $ 9
Available for sale (AFS) fixed maturities | 10,398 | 10,377 |  |
Total fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 10,687 | 10,752 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 34 | 12 |  |
Gross unrealized gains on available for sale fixed maturities | 98 | 107 |  |
Gross unrealized losses on available for sale fixed maturities | (353) | (470) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (255) | (363) |  |
Available for sale (AFS) fixed maturities | 10,398 | 10,377 |  |
U.S. Government and government agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 176 | 243 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 0 | 1 |  |
Gross unrealized losses on available for sale fixed maturities | (3) | (8) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (3) | (7) |  |
Available for sale (AFS) fixed maturities | 173 | 236 |  |
States, municipalities and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 905 | 1,014 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 3 | 8 |  |
Gross unrealized losses on available for sale fixed maturities | (49) | (38) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (46) | (30) |  |
Available for sale (AFS) fixed maturities | 859 | 984 |  |
Foreign government |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 236 | 236 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 2 | 1 |  |
Gross unrealized losses on available for sale fixed maturities | (1) | (7) |  |
Net unrealized gain (loss) on available for sale fixed maturities | 1 | (6) |  |
Available for sale (AFS) fixed maturities | 237 | 230 |  |
Residential MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 2,122 | 1,788 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 1 | 1 |  |
Gross unrealized gains on available for sale fixed maturities | 22 | 26 |  |
Gross unrealized losses on available for sale fixed maturities | (154) | (155) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (132) | (129) |  |
Available for sale (AFS) fixed maturities | 1,989 | 1,658 |  |
Commercial MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 51 | 75 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 0 | 0 |  |
Gross unrealized losses on available for sale fixed maturities | 0 | (1) |  |
Net unrealized gain (loss) on available for sale fixed maturities | 0 | (1) |  |
Available for sale (AFS) fixed maturities | 51 | 74 |  |
Collateralized loan obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 1,243 | 1,709 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 4 | 3 |  |
Gross unrealized gains on available for sale fixed maturities | 10 | 9 |  |
Gross unrealized losses on available for sale fixed maturities | (12) | (28) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (2) | (19) |  |
Available for sale (AFS) fixed maturities | 1,237 | 1,687 |  |
Other asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 2,412 | 2,477 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 6 | 5 |  |
Gross unrealized gains on available for sale fixed maturities | 19 | 10 |  |
Gross unrealized losses on available for sale fixed maturities | (69) | (120) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (50) | (110) |  |
Available for sale (AFS) fixed maturities | 2,356 | 2,362 |  |
Corporate and other |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 3,542 | 3,210 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 23 | 3 | $ 1 | $ 1
Gross unrealized gains on available for sale fixed maturities | 42 | 52 |  |
Gross unrealized losses on available for sale fixed maturities | (65) | (113) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (23) | (61) |  |
Available for sale (AFS) fixed maturities | $ 3,496 | $ 3,146 |  |

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