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RESERVE FOR LOSSES AND LAE - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 20, 2019
USD ($)
Dec. 31, 2024
USD ($)
group
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2015
USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Current year losses   $ 9,967 $ 8,432 $ 8,102  
Prior years   $ 1,337 (5) (2)  
Number of exposure groupings | group   250      
Contracts of insurance and reinsurance received claims during the past three years, in years   20 years      
Liabilities retroceded, percentage         100.00%
Retrocession agreement, consideration transferred         $ 140
Maximum liability retroceded $ 450       440
Total amount of liabilities retroceded         $ 300
Decrease in amount of liabilities retroceded $ 43        
Reinsurance recoverable for paid and unpaid losses   $ 3,100 2,300    
Asbestos And Environmental Reserves          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Prior years   54      
Munich Reinsurance Company          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Reinsurance recoverable for paid and unpaid losses   316      
Endurance Re          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Reinsurance recoverable for paid and unpaid losses   $ 187      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk | Munich Reinsurance Company          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage   10.10%      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk | Endurance Re          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage   6.00%      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk | Other Retrocessionaire          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage   5.00%      
Higher Premiums Earned          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Current year losses   $ 1,100      
Higher Premiums Earned | Reinsurance          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Prior years   684      
Catastrophe Losses          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Current year losses   423 585    
Attritional Losses          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Prior years     (401) $ 110  
Attritional Losses | Insurance          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Prior years   1,100 $ 285    
Attritional Losses | Other          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Prior years   403      
Mt Logan Re          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Reinsurance recoverable for paid and unpaid losses   $ 395      
Mt Logan Re | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage   12.60%