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Fair Value of Financial Instruments - Schedule of Carrying Amount and Fair Value 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 |  |  |
Policy loans | 401 |  | 390 |  |  |
Short-term investments | 1,945 |  | 2,397 |  |  |
Derivative assets | $ 1,610 |  | $ 227 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other invested assets |  | Other invested assets |  |  |
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 |  |  |
Other invested assets | 955 |  | 120 |  |  |
Carrying Amount |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Fixed maturity securities, available for sale | 46,480 |  | 12,877 |  |  |
Equity securities | 1,200 |  | 1,404 |  |  |
Policy loans | 401 |  | 390 |  |  |
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 | 832 |  | 14 |  |  |
Cash and cash equivalents | 13,895 |  | 3,192 |  |  |
Reinsurance recoverables and deposit assets | 15,261 |  | 0 |  |  |
Other assets - market risk benefit assets | 704 |  | 34 |  |  |
Separate account assets | 1,266 |  | 1,189 |  |  |
Total financial assets | 95,862 |  | 27,455 |  |  |
Financial liabilities: |  |  |  |  |  |
Policyholders’ account balances – embedded derivative | 1,196 |  | 873 |  |  |
Policyholders' account balances, excluding embedded derivative | 76,797 |  | 14,097 |  |  |
Market risk benefits | 3,276 |  | 34 |  |  |
Funds withheld liabilities | 79 |  | 0 |  |  |
Notes payable | 657 |  | 174 |  |  |
Long term borrowings | 2,476 |  | 1,493 |  |  |
Separate account liabilities | 1,266 |  | 1,189 |  |  |
Total financial liabilities | 85,747 |  | 17,860 |  |  |
Carrying Amount | Mortgage Receivable |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Financing receivables | 12,042 |  | 5,658 |  |  |
Carrying Amount | Private Loan |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Financing receivables | 1,724 |  | 194 |  |  |
Fair Value |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Fixed maturity securities, available for sale | 46,480 |  | 12,877 |  |  |
Equity securities | 1,200 |  | 1,404 |  |  |
Policy loans | 401 |  | 390 |  |  |
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 | 832 |  | 14 |  |  |
Cash and cash equivalents | 13,895 |  | 3,192 |  |  |
Reinsurance recoverables and deposit assets | 14,196 |  | 0 |  |  |
Other assets - market risk benefit assets | 704 |  | 34 |  |  |
Separate account assets | 1,266 |  | 1,189 |  |  |
Total financial assets | 94,572 |  | 27,202 |  |  |
Financial liabilities: |  |  |  |  |  |
Policyholders’ account balances – embedded derivative | 1,196 |  | 873 |  |  |
Policyholders' account balances, excluding embedded derivative | 76,797 |  | 14,097 |  |  |
Market risk benefits | 3,276 |  | 34 |  |  |
Funds withheld liabilities | 79 |  | 0 |  |  |
Notes payable | 657 |  | 174 |  |  |
Long term borrowings | 2,458 |  | 1,493 |  |  |
Separate account liabilities | 1,266 |  | 1,189 |  |  |
Total financial liabilities | 85,729 |  | 17,860 |  |  |
Fair Value | Mortgage Receivable |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Financing receivables | 11,812 |  | 5,405 |  |  |
Fair Value | Private Loan |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Financing receivables | 1,729 |  | 194 |  |  |
Portion at Other than Fair Value Measurement |  |  |  |  |  |
Financial liabilities: |  |  |  |  |  |
Other invested assets | $ 407 |  | $ 14 |  |  |

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