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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 10,583 | $ 10,736 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 16 | 11 | $ 7 | $ 9
Available for sale (AFS) fixed maturities | 10,044 | 10,095 |  |
Total fixed maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 10,583 | 10,736 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 16 | 11 |  |
Fixed maturities, available for sale, gross unrealized, gains | 54 | 39 |  |
Fixed maturities, available for sale, gross unrealized, losses | (577) | (669) |  |
Available for sale (AFS) fixed maturities | 10,044 | 10,095 |  |
Total fixed maturities | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (523) | (630) |  |
U.S. government and government agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 236 | 233 |  |
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 | (11) | (14) |  |
Available for sale (AFS) fixed maturities | 225 | 219 |  |
U.S. government and government agencies | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (11) | (14) |  |
States, municipalities and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,024 | 1,234 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 | 0 |  |
Fixed maturities, available for sale, gross unrealized, gains | 4 | 3 |  |
Fixed maturities, available for sale, gross unrealized, losses | (35) | (51) |  |
Available for sale (AFS) fixed maturities | 993 | 1,186 |  |
States, municipalities and political subdivisions | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (31) | (48) |  |
Foreign government |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 238 | 240 |  |
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 | (12) | (14) |  |
Available for sale (AFS) fixed maturities | 226 | 226 |  |
Foreign government | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (12) | (14) |  |
Residential MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,743 | 1,757 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 2 | 2 |  |
Fixed maturities, available for sale, gross unrealized, gains | 23 | 23 |  |
Fixed maturities, available for sale, gross unrealized, losses | (175) | (180) |  |
Available for sale (AFS) fixed maturities | 1,589 | 1,598 |  |
Residential MBS | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (152) | (157) |  |
Commercial MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 80 | 88 |  |
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 | (2) | (3) |  |
Available for sale (AFS) fixed maturities | 78 | 85 |  |
Commercial MBS | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (2) | (3) |  |
Collateralized loan obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,950 | 1,988 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 1 | 1 |  |
Fixed maturities, available for sale, gross unrealized, gains | 3 | 1 |  |
Fixed maturities, available for sale, gross unrealized, losses | (53) | (67) |  |
Available for sale (AFS) fixed maturities | 1,899 | 1,921 |  |
Collateralized loan obligations | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (50) | (66) |  |
Other asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,395 | 2,435 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 8 | 7 |  |
Fixed maturities, available for sale, gross unrealized, gains | 2 | 1 |  |
Fixed maturities, available for sale, gross unrealized, losses | (148) | (184) |  |
Available for sale (AFS) fixed maturities | 2,241 | 2,245 |  |
Other asset-backed securities | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | (146) | (183) |  |
Corporate and other |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,917 | 2,761 |  |
Fixed maturities, available for sale, allowance for expected credit losses | 5 | 1 | $ 1 | $ 1
Fixed maturities, available for sale, gross unrealized, gains | 22 | 11 |  |
Fixed maturities, available for sale, gross unrealized, losses | (141) | (156) |  |
Available for sale (AFS) fixed maturities | 2,793 | 2,615 |  |
Corporate and other | Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax | $ (119) | $ (145) |  |

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