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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Measurements of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Financial assets |  |  |  |  |  |
Equity securities | $ 1,200 |  | $ 1,404 |  |  |
Short-term investments | 1,945 |  | 2,397 |  |  |
Derivative assets | 1,610 |  | 227 |  |  |
Other assets - market risk benefit assets | 704 |  | 34 |  |  |
Separate account assets | 1,266 |  | 1,189 |  |  |
Financial liabilities |  |  |  |  |  |
Market risk benefits | 3,276 |  | 34 |  |  |
Separate account liabilities | 1,266 | $ 1,285 | 1,189 | $ 1,145 | $ 1,098 | $ 1,045
Separate accounts not subject to fair value hierarchy | 32 |  | 26 |  |  |
Total Fair Value |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 46,480 |  | 12,877 |  |  |
Equity securities | 1,200 |  | 1,404 |  |  |
Real estate at fair value | 1,279 |  | 0 |  |  |
Real estate partnerships at fair value | 39 |  | 0 |  |  |
Investment funds (fair value option) | 111 |  | 0 |  |  |
Short-term investments | 1,945 |  | 2,397 |  |  |
Derivative assets | 1,610 |  | 227 |  |  |
Collaterals received on derivatives (excluding excess collateral) | (1,587) |  | (226) |  |  |
Separately managed accounts | 89 |  | 105 |  |  |
Other invested assets - other | 425 |  | 0 |  |  |
Cash and cash equivalents | 13,895 |  | 3,192 |  |  |
Other assets - market risk benefit assets | 704 |  | 34 |  |  |
Separate account assets | 1,234 |  | 1,163 |  |  |
Total financial assets | 67,424 |  | 21,173 |  |  |
Financial liabilities |  |  |  |  |  |
Policyholders’ account balances – embedded derivative | 1,196 |  | 873 |  |  |
Market risk benefits | 3,276 |  | 34 |  |  |
Funds withheld liabilities | 79 |  | 0 |  |  |
Separate account liabilities | 1,234 |  | 1,163 |  |  |
Total financial liabilities | 5,785 |  | 2,070 |  |  |
Total Fair Value | U.S. treasury and government |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 83 |  | 62 |  |  |
Total Fair Value | U.S. states and political subdivisions |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 3,299 |  | 578 |  |  |
Total Fair Value | Foreign governments |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 453 |  | 9 |  |  |
Total Fair Value | Corporate debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 31,949 |  | 10,784 |  |  |
Total Fair Value | Residential mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 1,079 |  | 127 |  |  |
Total Fair Value | Commercial mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 2,766 |  | 0 |  |  |
Total Fair Value | Collateralized debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 6,851 |  | 1,317 |  |  |
Total Fair Value | Common stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 1,081 |  | 1,307 |  |  |
Total Fair Value | Preferred stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 114 |  | 97 |  |  |
Total Fair Value | Private equity and other |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 5 |  | 0 |  |  |
Level 1 |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 83 |  | 62 |  |  |
Equity securities | 407 |  | 336 |  |  |
Real estate at fair value | 0 |  | 0 |  |  |
Real estate partnerships at fair value | 0 |  | 0 |  |  |
Investment funds (fair value option) | 0 |  | 0 |  |  |
Short-term investments | 823 |  | 1,100 |  |  |
Derivative assets | 0 |  | 0 |  |  |
Collaterals received on derivatives (excluding excess collateral) | (1,587) |  | 0 |  |  |
Separately managed accounts | 0 |  | 0 |  |  |
Other invested assets - other | 0 |  | 0 |  |  |
Cash and cash equivalents | 13,895 |  | 3,192 |  |  |
Other assets - market risk benefit assets | 0 |  | 0 |  |  |
Separate account assets | 200 |  | 406 |  |  |
Total financial assets | 13,821 |  | 5,096 |  |  |
Financial liabilities |  |  |  |  |  |
Policyholders’ account balances – embedded derivative | 0 |  | 0 |  |  |
Market risk benefits | 0 |  | 0 |  |  |
Funds withheld liabilities | 0 |  | 0 |  |  |
Separate account liabilities | 200 |  | 406 |  |  |
Total financial liabilities | 200 |  | 406 |  |  |
Level 1 | U.S. treasury and government |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 83 |  | 62 |  |  |
Level 1 | U.S. states and political subdivisions |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 1 | Foreign governments |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 1 | Corporate debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 1 | Residential mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 1 | Commercial mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 1 | Collateralized debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 1 | Common stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 384 |  | 314 |  |  |
Level 1 | Preferred stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 23 |  | 22 |  |  |
Level 1 | Private equity and other |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Level 2 |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 40,110 |  | 9,700 |  |  |
Equity securities | 2 |  | 0 |  |  |
Real estate at fair value | 0 |  | 0 |  |  |
Real estate partnerships at fair value | 0 |  | 0 |  |  |
Investment funds (fair value option) | 0 |  | 0 |  |  |
Short-term investments | 544 |  | 0 |  |  |
Derivative assets | 1,356 |  | 0 |  |  |
Collaterals received on derivatives (excluding excess collateral) | 0 |  | 0 |  |  |
Separately managed accounts | 0 |  | 0 |  |  |
Other invested assets - other | 0 |  | 0 |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Other assets - market risk benefit assets | 0 |  | 0 |  |  |
Separate account assets | 1,034 |  | 757 |  |  |
Total financial assets | 43,046 |  | 10,457 |  |  |
Financial liabilities |  |  |  |  |  |
Policyholders’ account balances – embedded derivative | 0 |  | 0 |  |  |
Market risk benefits | 0 |  | 0 |  |  |
Funds withheld liabilities | 0 |  | 0 |  |  |
Separate account liabilities | 1,034 |  | 757 |  |  |
Total financial liabilities | 1,034 |  | 757 |  |  |
Level 2 | U.S. treasury and government |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 2 | U.S. states and political subdivisions |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 3,047 |  | 578 |  |  |
Level 2 | Foreign governments |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 453 |  | 9 |  |  |
Level 2 | Corporate debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 29,035 |  | 8,570 |  |  |
Level 2 | Residential mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 1,057 |  | 127 |  |  |
Level 2 | Commercial mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 2,743 |  | 0 |  |  |
Level 2 | Collateralized debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 3,775 |  | 416 |  |  |
Level 2 | Common stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 2 |  | 0 |  |  |
Level 2 | Preferred stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Level 2 | Private equity and other |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Level 3 |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 6,287 |  | 3,115 |  |  |
Equity securities | 791 |  | 1,068 |  |  |
Real estate at fair value | 1,279 |  | 0 |  |  |
Real estate partnerships at fair value | 39 |  | 0 |  |  |
Investment funds (fair value option) | 111 |  | 0 |  |  |
Short-term investments | 578 |  | 1,297 |  |  |
Derivative assets | 254 |  | 227 |  |  |
Collaterals received on derivatives (excluding excess collateral) | 0 |  | (226) |  |  |
Separately managed accounts | 89 |  | 105 |  |  |
Other invested assets - other | 425 |  | 0 |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Other assets - market risk benefit assets | 704 |  | 34 |  |  |
Separate account assets | 0 |  | 0 |  |  |
Total financial assets | 10,557 |  | 5,620 |  |  |
Financial liabilities |  |  |  |  |  |
Policyholders’ account balances – embedded derivative | 1,196 |  | 873 |  |  |
Market risk benefits | 3,276 |  | 34 |  |  |
Funds withheld liabilities | 79 |  | 0 |  |  |
Separate account liabilities | 0 |  | 0 |  |  |
Total financial liabilities | 4,551 |  | 907 |  |  |
Level 3 | U.S. treasury and government |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 3 | U.S. states and political subdivisions |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 252 |  | 0 |  |  |
Level 3 | Foreign governments |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 0 |  | 0 |  |  |
Level 3 | Corporate debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 2,914 |  | 2,214 |  |  |
Level 3 | Residential mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 22 |  | 0 |  |  |
Level 3 | Commercial mortgage-backed securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 23 |  | 0 |  |  |
Level 3 | Collateralized debt securities |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Fixed maturity securities, available for sale | 3,076 |  | 901 |  |  |
Level 3 | Common stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 695 |  | 993 |  |  |
Level 3 | Preferred stock |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 91 |  | 75 |  |  |
Level 3 | Private equity and other |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Equity securities | 5 |  | $ 0 |  |  |
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |  |
Financial assets |  |  |  |  |  |
Investment funds (fair value option) | $ 360 |  |  |  |  |

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