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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | $ 10,752 | $ 10,736 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 12 | 11 | $ 9 | $ 12
Available for sale (AFS) fixed maturities | 10,377 | 10,095 |  |
Total fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 10,752 | 10,736 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 12 | 11 |  |
Gross unrealized gains on available for sale fixed maturities | 107 | 39 |  |
Gross unrealized losses on available for sale fixed maturities | (470) | (669) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (363) | (630) |  |
Available for sale (AFS) fixed maturities | 10,377 | 10,095 |  |
U.S. Government and government agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 243 | 233 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 1 | 0 |  |
Gross unrealized losses on available for sale fixed maturities | (8) | (14) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (7) | (14) |  |
Available for sale (AFS) fixed maturities | 236 | 219 |  |
States, municipalities and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 1,014 | 1,234 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 8 | 3 |  |
Gross unrealized losses on available for sale fixed maturities | (38) | (51) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (30) | (48) |  |
Available for sale (AFS) fixed maturities | 984 | 1,186 |  |
Foreign government |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 236 | 240 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains on available for sale fixed maturities | 1 | 0 |  |
Gross unrealized losses on available for sale fixed maturities | (7) | (14) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (6) | (14) |  |
Available for sale (AFS) fixed maturities | 230 | 226 |  |
Residential MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 1,788 | 1,757 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 1 | 2 |  |
Gross unrealized gains on available for sale fixed maturities | 26 | 23 |  |
Gross unrealized losses on available for sale fixed maturities | (155) | (180) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (129) | (157) |  |
Available for sale (AFS) fixed maturities | 1,658 | 1,598 |  |
Commercial MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 75 | 88 |  |
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 | (1) | (3) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (1) | (3) |  |
Available for sale (AFS) fixed maturities | 74 | 85 |  |
Collateralized loan obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 1,709 | 1,988 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 3 | 1 |  |
Gross unrealized gains on available for sale fixed maturities | 9 | 1 |  |
Gross unrealized losses on available for sale fixed maturities | (28) | (67) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (19) | (66) |  |
Available for sale (AFS) fixed maturities | 1,687 | 1,921 |  |
Other asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 2,477 | 2,435 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 5 | 7 |  |
Gross unrealized gains on available for sale fixed maturities | 10 | 1 |  |
Gross unrealized losses on available for sale fixed maturities | (120) | (184) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (110) | (183) |  |
Available for sale (AFS) fixed maturities | 2,362 | 2,245 |  |
Corporate and other |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturies, available for sale, amortized cost | 3,210 | 2,761 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 3 | 1 | $ 1 | $ 2
Gross unrealized gains on available for sale fixed maturities | 52 | 11 |  |
Gross unrealized losses on available for sale fixed maturities | (113) | (156) |  |
Net unrealized gain (loss) on available for sale fixed maturities | (61) | (145) |  |
Available for sale (AFS) fixed maturities | $ 3,146 | $ 2,615 |  |

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