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DEBT AND FINANCING ARRANGEMENTS - Senior and notes payable, Dekania Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 10, 2019	Jun. 19, 2019	Dec. 06, 2017	Mar. 13, 2014
Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 52	$ 67	$ 64
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%
Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate				4.90%
Interest expense	$ 21	$ 1
AXIS Specialty Finance LLC
Debt Instrument [Line Items]
Percentage ownership in subsidiary	100.00%				100.00%	100.00%	100.00%
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%

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