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RELATED-PARTY TRANSACTIONS - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 72 Months Ended 96 Months Ended
Dec. 31, 2017
USD ($)
Jan. 31, 2024
EUR (€)
Dec. 31, 2015
USD ($)
shares
Mar. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jan. 31, 2022
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2009
Dec. 31, 2017
Dec. 31, 2023
USD ($)
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                
Reinsurance agreements, aggregate loss       $ 1,375   $ 1,394          
Subject loss reserves $ 2,300                    
Amount transferred 1,000                    
Coverage Period, 2002 Through 2017                      
Related Party Transaction [Line Items]                      
Reinsurance recoverables       718             $ 759
Coverage Period, 2007 Through 2017                      
Related Party Transaction [Line Items]                      
Reinsurance recoverables       41             45
Coverage Period, 2004 Through 2009                      
Related Party Transaction [Line Items]                      
Reinsurance recoverables       7             7
Minimum | Coverage Period, 2002 Through 2017                      
Related Party Transaction [Line Items]                      
Share reinsurance percentage                   20.00%  
Minimum | Coverage Period, 2007 Through 2017                      
Related Party Transaction [Line Items]                      
Share reinsurance percentage                   60.00%  
Minimum | Coverage Period, 2004 Through 2009                      
Related Party Transaction [Line Items]                      
Share reinsurance percentage                 2.00%    
Maximum | Coverage Period, 2002 Through 2017                      
Related Party Transaction [Line Items]                      
Share reinsurance percentage                   60.00%  
Maximum | Coverage Period, 2007 Through 2017                      
Related Party Transaction [Line Items]                      
Share reinsurance percentage                   75.00%  
Maximum | Coverage Period, 2004 Through 2009                      
Related Party Transaction [Line Items]                      
Share reinsurance percentage                 8.00%    
Everest Re Group, Ltd.                      
Related Party Transaction [Line Items]                      
Reinsurance agreements, aggregate loss         $ 37            
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 | £               £ 100      
Reinsurance agreement, threshold | £               24      
Payments for coverage | £               £ 5      
Everest Re Group, Ltd. | Ireland Re | Catastrophe Reinsurance                      
Related Party Transaction [Line Items]                      
Reinsurance agreement | €   € 61         € 210        
Reinsurance agreement, threshold | €   139         18        
Payments for coverage | €   € 2         € 14        
Bermuda Re                      
Related Party Transaction [Line Items]                      
Reinsurance recoverables       $ 807             $ 807
Amount transferred $ 970