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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% |  |

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