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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Measurements of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Financial assets |  |  |
Equity securities, at fair value | $ 1,142 | $ 1,404 |
Short-term investments, at estimated fair value | 4,177 | 2,397 |
Derivative assets | 1,346 | 227 |
Other assets - market risk benefits | 856 | 34 |
Separate account assets | 1,343 | 1,189 |
Financial liabilities |  |  |
Market risk benefits | 3,655 | 34 |
Separate account liabilities | 1,343 | 1,189 | $ 1,045
Separate account, asset (liability), not subject to fair value | 31 | 26 |
Total Fair Value |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 47,292 | 12,877 |
Equity securities, at fair value | 1,142 | 1,404 |
Real estate at fair value | 1,283 |  |
Real estate partnerships | 932 |  |
Investments funds | 124 |  |
Short-term investments, at estimated fair value | 4,177 | 2,397 |
Derivative assets | 1,341 | 227 |
Collaterals received on derivatives (excluding excess collateral) | (1,298) | (226) |
Separately managed accounts | 71 | 105 |
Other | 315 |  |
Cash and cash equivalents | 11,330 | 3,192 |
Other assets - market risk benefits | 857 | 34 |
Separate account assets | 1,312 | 1,163 |
Total financial assets | 68,878 | 21,173 |
Financial liabilities |  |  |
Policyholders’ account balances – embedded derivative | 1,123 | 872 |
Market risk benefits | 3,655 | 34 |
Funds withheld for reinsurance liabilities | 37 |  |
Separate account liabilities | 1,312 | 1,163 |
Total financial liabilities | 6,127 | 2,069 |
Total Fair Value | U.S. treasury and government |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 86 | 62 |
Total Fair Value | U.S. states and political subdivisions |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 3,207 | 578 |
Total Fair Value | Foreign governments |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 1,541 | 9 |
Total Fair Value | Corporate debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 32,848 | 10,784 |
Total Fair Value | Residential mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 1,106 | 127 |
Total Fair Value | Commercial mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 2,796 |  |
Total Fair Value | Collateralized debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 5,708 | 1,317 |
Total Fair Value | Common stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 747 | 1,307 |
Total Fair Value | Preferred Stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 391 | 97 |
Total Fair Value | Private equity and other |  |  |
Financial assets |  |  |
Equity securities, at fair value | 4 |  |
Level 1 |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 76 | 62 |
Equity securities, at fair value | 628 | 336 |
Real estate at fair value | 0 |  |
Real estate partnerships | 0 |  |
Investments funds | 0 |  |
Short-term investments, at estimated fair value | 3,003 | 1,100 |
Derivative assets | 0 | 0 |
Collaterals received on derivatives (excluding excess collateral) | (1,298) | 0 |
Separately managed accounts | 0 | 0 |
Other | 0 |  |
Cash and cash equivalents | 11,330 | 3,192 |
Other assets - market risk benefits | 0 | 0 |
Separate account assets | 258 | 406 |
Total financial assets | 13,997 | 5,096 |
Financial liabilities |  |  |
Policyholders’ account balances – embedded derivative | 0 | 0 |
Market risk benefits | 0 | 0 |
Funds withheld for reinsurance liabilities | 0 |  |
Separate account liabilities | 258 | 406 |
Total financial liabilities | 258 | 406 |
Level 1 | U.S. treasury and government |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 76 | 62 |
Level 1 | U.S. states and political subdivisions |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 1 | Foreign governments |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 1 | Corporate debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 1 | Residential mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 1 | Commercial mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 |  |
Level 1 | Collateralized debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 1 | Common stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 606 | 314 |
Level 1 | Preferred Stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 22 | 22 |
Level 1 | Private equity and other |  |  |
Financial assets |  |  |
Equity securities, at fair value | 0 |  |
Level 2 |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 41,779 | 9,700 |
Equity securities, at fair value | 37 | 0 |
Real estate at fair value | 0 |  |
Real estate partnerships | 0 |  |
Investments funds | 0 |  |
Short-term investments, at estimated fair value | 821 | 0 |
Derivative assets | 1,118 | 0 |
Collaterals received on derivatives (excluding excess collateral) | 0 | 0 |
Separately managed accounts | 0 | 0 |
Other | 11 |  |
Cash and cash equivalents | 0 | 0 |
Other assets - market risk benefits | 0 | 0 |
Separate account assets | 1,054 | 757 |
Total financial assets | 44,820 | 10,457 |
Financial liabilities |  |  |
Policyholders’ account balances – embedded derivative | 0 | 0 |
Market risk benefits | 0 | 0 |
Funds withheld for reinsurance liabilities | 0 |  |
Separate account liabilities | 1,054 | 757 |
Total financial liabilities | 1,054 | 757 |
Level 2 | U.S. treasury and government |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 10 | 0 |
Level 2 | U.S. states and political subdivisions |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 3,151 | 578 |
Level 2 | Foreign governments |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 1,541 | 9 |
Level 2 | Corporate debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 30,192 | 8,570 |
Level 2 | Residential mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 1,087 | 127 |
Level 2 | Commercial mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 2,721 |  |
Level 2 | Collateralized debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 3,077 | 416 |
Level 2 | Common stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 25 | 0 |
Level 2 | Preferred Stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 12 | 0 |
Level 2 | Private equity and other |  |  |
Financial assets |  |  |
Equity securities, at fair value | 0 |  |
Level 3 |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 5,437 | 3,115 |
Equity securities, at fair value | 477 | 1,068 |
Real estate at fair value | 1,283 |  |
Real estate partnerships | 932 |  |
Investments funds | 124 |  |
Short-term investments, at estimated fair value | 353 | 1,297 |
Derivative assets | 223 | 227 |
Collaterals received on derivatives (excluding excess collateral) | 0 | (226) |
Separately managed accounts | 71 | 105 |
Other | 304 |  |
Cash and cash equivalents | 0 | 0 |
Other assets - market risk benefits | 857 | 34 |
Separate account assets | 0 | 0 |
Total financial assets | 10,061 | 5,620 |
Financial liabilities |  |  |
Policyholders’ account balances – embedded derivative | 1,123 | 872 |
Market risk benefits | 3,655 | 34 |
Funds withheld for reinsurance liabilities | 37 |  |
Separate account liabilities | 0 | 0 |
Total financial liabilities | 4,815 | 906 |
Level 3 | U.S. treasury and government |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 3 | U.S. states and political subdivisions |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 56 | 0 |
Level 3 | Foreign governments |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |
Level 3 | Corporate debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 2,656 | 2,214 |
Level 3 | Residential mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 19 | 0 |
Level 3 | Commercial mortgage-backed securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 75 |  |
Level 3 | Collateralized debt securities |  |  |
Financial assets |  |  |
Available-for-sale fixed maturity securities | 2,631 | 901 |
Level 3 | Common stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 116 | 993 |
Level 3 | Preferred Stock |  |  |
Financial assets |  |  |
Equity securities, at fair value | 357 | 75 |
Level 3 | Private equity and other |  |  |
Financial assets |  |  |
Equity securities, at fair value | 4 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |
Financial assets |  |  |
Investments funds | $ 353 | $ 1,600 |

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