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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 10,488 |  | $ 10,736 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 16 | $ 16 | 11 | $ 7 | $ 7 | $ 9
Available for sale (AFS) fixed maturities | 9,885 |  | 10,095 |  |  |
Total fixed maturities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 10,488 |  | 10,736 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 16 |  | 11 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 40 |  | 39 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (627) |  | (669) |  |  |
Available for sale (AFS) fixed maturities | 9,885 |  | 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 | (587) |  | (630) |  |  |
U.S. government and government agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 241 |  | 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 | (12) |  | (14) |  |  |
Available for sale (AFS) fixed maturities | 229 |  | 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 | (12) |  | (14) |  |  |
States, municipalities and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,012 |  | 1,234 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 3 |  | 3 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (47) |  | (51) |  |  |
Available for sale (AFS) fixed maturities | 968 |  | 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 | (44) |  | (48) |  |  |
Foreign government |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 242 |  | 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 | (14) |  | (14) |  |  |
Available for sale (AFS) fixed maturities | 228 |  | 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 | (14) |  | (14) |  |  |
Residential MBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,710 |  | 1,757 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 2 |  | 2 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 20 |  | 23 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (182) |  | (180) |  |  |
Available for sale (AFS) fixed maturities | 1,546 |  | 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 | (162) |  | (157) |  |  |
Commercial MBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 81 |  | 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 | 79 |  | 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 | 1,906 |  | 1,988 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 2 |  | 1 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 5 |  | 1 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (50) |  | (67) |  |  |
Available for sale (AFS) fixed maturities | 1,859 |  | 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 | (45) |  | (66) |  |  |
Other asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,338 |  | 2,435 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 7 |  | 7 |  |  |
Fixed maturities, available for sale, gross unrealized, gains | 0 |  | 1 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (162) |  | (184) |  |  |
Available for sale (AFS) fixed maturities | 2,169 |  | 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 | (162) |  | (183) |  |  |
Corporate and other |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,958 |  | 2,761 |  |  |
Fixed maturities, available for sale, allowance for expected credit losses | 5 | $ 5 | 1 | $ 0 | $ 1 | $ 1
Fixed maturities, available for sale, gross unrealized, gains | 12 |  | 11 |  |  |
Fixed maturities, available for sale, gross unrealized, losses | (158) |  | (156) |  |  |
Available for sale (AFS) fixed maturities | 2,807 |  | 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 | $ (146) |  | $ (145) |  |  |

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