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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 10,632 |  | $ 10,687 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 15 | $ 41 | 34 | $ 10 | $ 11 | $ 12
Available for sale (AFS) fixed maturities | 10,489 |  | 10,398 |  |  |
Total fixed maturities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 10,632 |  | 10,687 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 15 |  | 34 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 142 |  | 98 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (270) |  | (353) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (128) |  | (255) |  |  |
Available for sale (AFS) fixed maturities | 10,489 |  | 10,398 |  |  |
U.S. government and government agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 188 |  | 176 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 1 |  | 0 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (1) |  | (3) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | 0 |  | (3) |  |  |
Available for sale (AFS) fixed maturities | 188 |  | 173 |  |  |
States, municipalities and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 910 |  | 905 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 6 |  | 3 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (48) |  | (49) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (42) |  | (46) |  |  |
Available for sale (AFS) fixed maturities | 868 |  | 859 |  |  |
Foreign government |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 252 |  | 236 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 3 |  | 2 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | 0 |  | (1) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | 3 |  | 1 |  |  |
Available for sale (AFS) fixed maturities | 255 |  | 237 |  |  |
Residential MBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,314 |  | 2,122 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 1 |  | 1 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 32 |  | 22 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (128) |  | (154) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (96) |  | (132) |  |  |
Available for sale (AFS) fixed maturities | 2,217 |  | 1,989 |  |  |
Collateralized loan obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,094 |  | 1,243 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 4 |  | 4 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 6 |  | 10 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (8) |  | (12) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (2) |  | (2) |  |  |
Available for sale (AFS) fixed maturities | 1,088 |  | 1,237 |  |  |
Other asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,433 |  | 2,463 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 5 |  | 6 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 25 |  | 19 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (47) |  | (69) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (22) |  | (50) |  |  |
Available for sale (AFS) fixed maturities | 2,406 |  | 2,407 |  |  |
Corporate and other |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 3,441 |  | 3,542 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 5 | $ 30 | 23 | $ 0 | $ 0 | $ 3
Fixed maturities, available for sale, gross unrealized, gains | 69 |  | 42 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (38) |  | (65) |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | 31 |  | (23) |  |  |
Available for sale (AFS) fixed maturities | $ 3,467 |  | $ 3,496 |  |  |

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