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RELATED-PARTY TRANSACTIONS - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
1 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
shares
Jan. 31, 2024
EUR (€)
Jan. 31, 2022
EUR (€)
Dec. 31, 2021
GBP (£)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]              
Shares received in exchange from affiliated entity for transfer | shares   1,773.214          
Preferred shares par value | $   $ 1          
Annual dividend rate   1.75%          
Shares transferred to affiliated entity | shares   9,719,971          
Subject loss reserves | $ $ 2,300            
Amount transferred | $ 1,000            
Bermuda Re              
Related Party Transaction [Line Items]              
Adverse development coverage | $ 500            
Everest Re Group, Ltd. | Bermuda Re | Catastrophe Reinsurance              
Related Party Transaction [Line Items]              
Reinsurance agreement | £         £ 110    
Reinsurance agreement, threshold | £         29    
Payments for coverage | £         £ 4    
Everest Re Group, Ltd. | Ireland Re | Catastrophe Reinsurance              
Related Party Transaction [Line Items]              
Reinsurance agreement | €       € 121      
Reinsurance agreement, threshold | €       18      
Payments for coverage | €       € 10      
Everest Re Group, Ltd. | Ireland Re | Catastrophe Reinsurance | Forecast              
Related Party Transaction [Line Items]              
Reinsurance agreement | €     € 61        
Reinsurance agreement, threshold | €     139        
Payments for coverage | €     € 2        
Bermuda Re              
Related Party Transaction [Line Items]              
Amount transferred | $ $ 970            
Reinsurance recoverables - affiliated | $           $ 803 $ 804