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DEBT AND FINANCING ARRANGEMENTS - Senior and Notes payable, Dekania Notes (Details) - USD ($)
12 Months Ended
Dec. 06, 2017
Mar. 13, 2014
Mar. 23, 2010
Sep. 29, 2004
Jun. 30, 2004
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Senior notes [Line Items]                
Net proceeds from issuance of debt           $ 0 $ 346,362,000 $ 0
Senior Notes                
Senior notes [Line Items]                
Interest Expense           64,000,000 51,000,000 $ 50,000,000
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes                
Senior notes [Line Items]                
Face amount           $ 500,000,000    
Interest rate           5.875%    
Issue price (percentage of face amount)     99.624%          
Net proceeds from issuance of debt     $ 495,000,000          
Senior Notes | Senior Notes Due 2019 Axis Specialty Finance PLC 2014                
Senior notes [Line Items]                
Face amount           $ 250,000,000    
Interest rate           2.65%    
Issue price (percentage of face amount)   99.896%            
Net proceeds from issuance of debt   $ 248,000,000            
Senior Notes | Senior Notes Due 2045 Axis Specialty Finance PLC 2014                
Senior notes [Line Items]                
Face amount           $ 250,000,000    
Interest rate           5.15%    
Issue price (percentage of face amount)   99.474%            
Net proceeds from issuance of debt   $ 246,000,000            
Senior Notes | Senior Notes Axis Specialty Finance PLC 2017                
Senior notes [Line Items]                
Face amount           $ 350,000,000    
Interest rate           4.00%    
Issue price (percentage of face amount) 99.78%              
Net proceeds from issuance of debt $ 347,000,000              
Subordinated Debt                
Senior notes [Line Items]                
Net proceeds from issuance of debt         $ 35,000,000      
Interest Expense           $ 2,000,000 $ 2,000,000  
Subordinated Debt | Dekania Notes, 15 Million                
Senior notes [Line Items]                
Face amount         15,000,000      
Subordinated Debt | Dekania Notes, 11 Million                
Senior notes [Line Items]                
Face amount         $ 11,000,000      
Subordinated Debt | Dekania Notes, 10 Million                
Senior notes [Line Items]                
Face amount       $ 10,000,000        
AXIS Specialty Finance LLC                
Senior notes [Line Items]                
Percentage ownership in subsidiary           100.00%    
AXIS Specialty Finance PLC                
Senior notes [Line Items]                
Percentage ownership in subsidiary 100.00%              
London Interbank Offered Rate (LIBOR) | Subordinated Debt | Dekania Notes, 15 Million                
Senior notes [Line Items]                
Basis spread on variable rate         3.50%      
London Interbank Offered Rate (LIBOR) | Subordinated Debt | Dekania Notes, 11 Million                
Senior notes [Line Items]                
Basis spread on variable rate         4.05%      
London Interbank Offered Rate (LIBOR) | Subordinated Debt | Dekania Notes, 10 Million                
Senior notes [Line Items]                
Basis spread on variable rate       3.50%