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DEBT AND FINANCING ARRANGEMENTS - Senior and notes payable, Dekania Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 10, 2019	Jun. 19, 2019	Dec. 06, 2017	Mar. 13, 2014
Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 40	$ 52	$ 67
Senior Notes \| Senior Notes Due 2045 Axis Specialty Finance PLC 2014
Debt Instrument [Line Items]
Interest rate							5.15%
Senior Notes \| Senior Notes Axis Specialty Finance PLC 2017
Debt Instrument [Line Items]
Interest rate						4.00%
Senior Notes \| 3.9% Senior Notes
Debt Instrument [Line Items]
Interest rate					3.90%
Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate				4.90%
Interest expense	$ 21	$ 21
AXIS Specialty Finance LLC \| Senior Notes \| 3.9% Senior Notes
Debt Instrument [Line Items]
Interest rate					3.90%
AXIS Specialty Finance LLC \| Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate				4.90%
AXIS Specialty Finance LLC \| Subsidiary Issuer
Debt Instrument [Line Items]
Percentage ownership in subsidiary	100.00%				100.00%
AXIS Specialty Finance PLC \| Subsidiary Issuer
Debt Instrument [Line Items]
Percentage ownership in subsidiary	100.00%					100.00%	100.00%