v3.26.1
FAIR VALUE - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value $ 21,152,000,000   $ 21,152,000,000   $ 20,978,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 $ 0 0 $ 0  
Other invested assets, at fair value 1,597,000,000   1,597,000,000   1,622,000,000
Fair Value | Investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other invested assets, at fair value $ 206,000,000   $ 206,000,000   233,000,000
4.868% Senior notes | Senior Notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Observable input constant maturity (in years)     10 years    
Stated rate (as a percent) 4.868%   4.868%    
Redeemable Convertible Preferred Stock          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Preferred stock term (in years)     25 years    
Annual dividend rate (as a percent)     1.75%    
Fixed maturities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value $ 2,800,000,000   $ 2,800,000,000   $ 2,500,000,000