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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Hierarchy Measurements of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Financial assets |  |  |  |
Available-for-sale fixed maturity securities | $ 56,222 |  |  |
Equity securities | 7,530 | $ 3,854 |  |
Investment real estate | 2,593 | 2,366 |  |
Real estate partnerships | 4,205 | 3,438 |  |
Investment funds | 6,421 | 6,111 |  |
Short-term investments | 4,454 | 4,400 |  |
Cash and cash equivalents | 13,091 | 12,243 |  |
Other assets – market risk benefit assets | 2,668 | 2,461 |  |
Separate account assets | 1,322 | 1,343 |  |
Financial liabilities |  |  |  |
Policyholders’ account balances – embedded derivative | 6,320 | 1,160 |  |
Market risk benefits | 4,227 | 3,655 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 253 | 57 |  |
Separate account liabilities | 1,322 | 1,343 | $ 1,266 | $ 1,189
Not subject to fair value hierarchy |  |  |  |
Financial assets |  |  |  |
Investment funds | 375 | 380 |  |
Other | 649 | 637 |  |
Separate account assets | 30 | 31 |  |
Total Fair Value |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 56,222 | 53,802 |  |
Equity securities | 7,530 | 3,854 |  |
Investment real estate | 1,271 | 1,283 |  |
Real estate partnerships | 2,329 | 1,529 |  |
Investment funds | 141 | 124 |  |
Short-term investments | 4,454 | 4,400 |  |
Derivative assets | 1,160 | 1,361 |  |
Separately managed accounts | 61 | 71 |  |
Other | 197 | 319 |  |
Cash and cash equivalents | 13,091 | 12,243 |  |
Reinsurance funds withheld – embedded derivative | 6 | 18 |  |
Premiums due and other receivables – derivative asset | 22 | 22 |  |
Other assets – market risk benefit assets | 1,034 | 856 |  |
Separate account assets | 1,292 | 1,312 |  |
Total financial assets | 88,810 | 81,194 |  |
Financial liabilities |  |  |  |
Policyholders’ account balances – embedded derivative | 6,257 | 1,123 |  |
Market risk benefits | 4,227 | 3,655 |  |
Funds withheld for reinsurance liabilities – embedded derivative | 63 | 37 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 169 | 27 |  |
Separate account liabilities | 1,292 | 1,312 |  |
Total financial liabilities | 12,008 | 6,154 |  |
Other invested assets | 197 | 171 |  |
Total Fair Value | U.S. treasury and government |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 365 | 369 |  |
Total Fair Value | U.S. state and municipal |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 3,182 | 3,289 |  |
Total Fair Value | Foreign governments |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 1,889 | 2,042 |  |
Total Fair Value | Corporate debt securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 39,493 | 37,380 |  |
Total Fair Value | Residential mortgage-backed securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 1,196 | 1,310 |  |
Total Fair Value | Commercial mortgage-backed securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 3,877 | 3,320 |  |
Total Fair Value | Collateralized debt securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 6,220 | 6,092 |  |
Total Fair Value | Common stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 7,049 | 3,412 |  |
Total Fair Value | Preferred stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 481 | 438 |  |
Total Fair Value | Private equity and other |  |  |  |
Financial assets |  |  |  |
Equity securities |  | 4 |  |
Level 1 |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 302 | 310 |  |
Equity securities | 6,661 | 2,894 |  |
Investment real estate | 0 | 0 |  |
Real estate partnerships | 0 | 0 |  |
Investment funds | 0 | 0 |  |
Short-term investments | 2,912 | 3,213 |  |
Derivative assets | 0 | 0 |  |
Separately managed accounts | 0 | 0 |  |
Other | 0 | 0 |  |
Cash and cash equivalents | 13,091 | 12,243 |  |
Reinsurance funds withheld – embedded derivative | 0 | 0 |  |
Premiums due and other receivables – derivative asset | 0 | 0 |  |
Other assets – market risk benefit assets | 0 | 0 |  |
Separate account assets | 976 | 258 |  |
Total financial assets | 23,942 | 18,918 |  |
Financial liabilities |  |  |  |
Policyholders’ account balances – embedded derivative | 0 | 0 |  |
Market risk benefits | 0 | 0 |  |
Funds withheld for reinsurance liabilities – embedded derivative | 0 | 0 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 0 | 0 |  |
Separate account liabilities | 976 | 258 |  |
Total financial liabilities | 976 | 258 |  |
Level 1 | U.S. treasury and government |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 302 | 310 |  |
Level 1 | U.S. state and municipal |  |  |  |
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 | 0 |  |
Level 1 | Collateralized debt securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |  |
Level 1 | Common stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 6,641 | 2,858 |  |
Level 1 | Preferred stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 20 | 36 |  |
Level 1 | Private equity and other |  |  |  |
Financial assets |  |  |  |
Equity securities |  | 0 |  |
Level 2 |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 51,663 | 48,013 |  |
Equity securities | 25 | 14 |  |
Investment real estate | 0 | 0 |  |
Real estate partnerships | 0 | 0 |  |
Investment funds | 0 | 0 |  |
Short-term investments | 1,060 | 834 |  |
Derivative assets | 972 | 1,138 |  |
Separately managed accounts | 0 | 0 |  |
Other | 4 | 11 |  |
Cash and cash equivalents | 0 | 0 |  |
Reinsurance funds withheld – embedded derivative | 0 | 0 |  |
Premiums due and other receivables – derivative asset | 22 | 22 |  |
Other assets – market risk benefit assets | 0 | 0 |  |
Separate account assets | 316 | 1,054 |  |
Total financial assets | 54,062 | 51,086 |  |
Financial liabilities |  |  |  |
Policyholders’ account balances – embedded derivative | 0 | 0 |  |
Market risk benefits | 0 | 0 |  |
Funds withheld for reinsurance liabilities – embedded derivative | 0 | 0 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 169 | 27 |  |
Separate account liabilities | 316 | 1,054 |  |
Total financial liabilities | 485 | 1,081 |  |
Level 2 | U.S. treasury and government |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 63 | 59 |  |
Level 2 | U.S. state and municipal |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 3,127 | 3,233 |  |
Level 2 | Foreign governments |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 1,889 | 2,042 |  |
Level 2 | Corporate debt securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 38,701 | 34,696 |  |
Level 2 | Residential mortgage-backed securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 1,177 | 1,291 |  |
Level 2 | Commercial mortgage-backed securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 3,839 | 3,245 |  |
Level 2 | Collateralized debt securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 2,867 | 3,447 |  |
Level 2 | Common stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 2 | 2 |  |
Level 2 | Preferred stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 23 | 12 |  |
Level 2 | Private equity and other |  |  |  |
Financial assets |  |  |  |
Equity securities |  | 0 |  |
Level 3 |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 4,257 | 5,479 |  |
Equity securities | 844 | 946 |  |
Investment real estate | 1,271 | 1,283 |  |
Real estate partnerships | 2,329 | 1,529 |  |
Investment funds | 141 | 124 |  |
Short-term investments | 482 | 353 |  |
Derivative assets | 188 | 223 |  |
Separately managed accounts | 61 | 71 |  |
Other | 193 | 308 |  |
Cash and cash equivalents | 0 | 0 |  |
Reinsurance funds withheld – embedded derivative | 6 | 18 |  |
Premiums due and other receivables – derivative asset | 0 | 0 |  |
Other assets – market risk benefit assets | 1,034 | 856 |  |
Separate account assets | 0 | 0 |  |
Total financial assets | 10,806 | 11,190 |  |
Financial liabilities |  |  |  |
Policyholders’ account balances – embedded derivative | 6,257 | 1,123 |  |
Market risk benefits | 4,227 | 3,655 |  |
Funds withheld for reinsurance liabilities – embedded derivative | 63 | 37 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 0 | 0 |  |
Separate account liabilities | 0 | 0 |  |
Total financial liabilities | 10,547 | 4,815 |  |
Level 3 | U.S. treasury and government |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 0 | 0 |  |
Level 3 | U.S. state and municipal |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 55 | 56 |  |
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 | 792 | 2,684 |  |
Level 3 | Residential mortgage-backed securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 19 | 19 |  |
Level 3 | Commercial mortgage-backed securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 38 | 75 |  |
Level 3 | Collateralized debt securities |  |  |  |
Financial assets |  |  |  |
Available-for-sale fixed maturity securities | 3,353 | 2,645 |  |
Level 3 | Common stock |  |  |  |
Financial assets |  |  |  |
Equity securities | 406 | 552 |  |
Level 3 | Preferred stock |  |  |  |
Financial assets |  |  |  |
Equity securities | $ 438 | 390 |  |
Level 3 | Private equity and other |  |  |  |
Financial assets |  |  |  |
Equity securities |  | $ 4 |  |

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