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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 10,788 | $ 10,687 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 41 | 34 | $ 11 | $ 12
Available for sale (AFS) fixed maturities | 10,568 | 10,398 |  |
Total fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 10,788 | 10,687 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 41 | 34 |  |
Fixed maturities, available for sale, gross unrealized, gains | 122 | 98 |  |
Fixed maturities, available for sale, gross unrealized, losses | (301) | (353) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (179) | (255) |  |
Available for sale (AFS) fixed maturities | 10,568 | 10,398 |  |
U.S. government and government agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 182 | 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 | (3) | (3) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (2) | (3) |  |
Available for sale (AFS) fixed maturities | 180 | 173 |  |
States, municipalities and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 921 | 905 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Fixed maturities, available for sale, gross unrealized, gains | 5 | 3 |  |
Fixed maturities, available for sale, gross unrealized, losses | (51) | (49) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (46) | (46) |  |
Available for sale (AFS) fixed maturities | 875 | 859 |  |
Foreign government |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 237 | 236 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Fixed maturities, available for sale, gross unrealized, gains | 4 | 2 |  |
Fixed maturities, available for sale, gross unrealized, losses | 0 | (1) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | 4 | 1 |  |
Available for sale (AFS) fixed maturities | 241 | 237 |  |
Residential MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,223 | 2,122 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 1 | 1 |  |
Fixed maturities, available for sale, gross unrealized, gains | 29 | 22 |  |
Fixed maturities, available for sale, gross unrealized, losses | (133) | (154) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (104) | (132) |  |
Available for sale (AFS) fixed maturities | 2,118 | 1,989 |  |
Commercial MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 41 | 51 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Fixed maturities, available for sale, gross unrealized, gains | 0 | 0 |  |
Fixed maturities, available for sale, gross unrealized, losses | 0 | 0 |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | 0 | 0 |  |
Available for sale (AFS) fixed maturities | 41 | 51 |  |
Collateralized loan obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,250 | 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 | (11) | (12) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (5) | (2) |  |
Available for sale (AFS) fixed maturities | 1,241 | 1,237 |  |
Other asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,420 | 2,412 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 6 | 6 |  |
Fixed maturities, available for sale, gross unrealized, gains | 22 | 19 |  |
Fixed maturities, available for sale, gross unrealized, losses | (55) | (69) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (33) | (50) |  |
Available for sale (AFS) fixed maturities | 2,381 | 2,356 |  |
Corporate and other |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 3,514 | 3,542 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 30 | 23 | $ 0 | $ 3
Fixed maturities, available for sale, gross unrealized, gains | 55 | 42 |  |
Fixed maturities, available for sale, gross unrealized, losses | (48) | (65) |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | 7 | (23) |  |
Available for sale (AFS) fixed maturities | $ 3,491 | $ 3,496 |  |

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