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DEBT AND FINANCING ARRANGEMENTS - Senior and Notes Payable (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 10, 2019
Jun. 19, 2019
Dec. 06, 2017
Mar. 13, 2014
Senior Notes              
Debt Instrument [Line Items]              
Interest expense $ 40 $ 40 $ 40        
Senior Notes | 5.150% Senior Notes              
Debt Instrument [Line Items]              
Interest rate (percent)             5.15%
Senior Notes | 4.000% Senior Notes              
Debt Instrument [Line Items]              
Interest rate (percent)           4.00%  
Senior Notes | 3.900% Senior Notes              
Debt Instrument [Line Items]              
Interest rate (percent)         3.90%    
Junior Subordinated Notes              
Debt Instrument [Line Items]              
Interest rate (percent)       4.90%      
Interest expense $ 21 $ 21 $ 21        
AXIS Specialty Finance PLC | Subsidiary Issuer              
Debt Instrument [Line Items]              
Percentage ownership in subsidiary (percent) 100.00%         100.00% 100.00%
AXIS Specialty Finance LLC | Junior Subordinated Notes              
Debt Instrument [Line Items]              
Interest rate (percent)       4.90%      
AXIS Specialty Finance LLC | Subsidiary Issuer              
Debt Instrument [Line Items]              
Percentage ownership in subsidiary (percent) 100.00%       100.00%