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INVESTMENTS - Schedule of Changes in Net Unrealized Appreciation (Depreciation) for Company's Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]      
Change in unrealized appreciation (depreciation), pre-tax $ 1,129 $ (2,225)  
Deferred tax benefit (expense) (142) 277  
Total URA(D) on securities arising during the period 986 (1,948) $ (485)
Fixed maturity securities - available for sale and short-term investments      
Debt Securities, Available-for-Sale [Line Items]      
Change in unrealized appreciation (depreciation), pre-tax $ 1,129 $ (2,225)