LONG-TERM SUBORDINATED NOTES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	May 17, 2017	Dec. 31, 2023	Dec. 31, 2022	Feb. 14, 2024	May 14, 2017
Long Term Subordinated Debt
Debt Instrument [Line Items]
Outstanding debt reduction			$ 6
Gain on repurchase and retirement of debt			$ 1
6.60% Long-Term Notes Due 2067 | Long Term Subordinated Debt
Debt Instrument [Line Items]
Other invested assets, at fair value					6.60%
Interest basis, 3 month LIBOR plus number of basis points, reset quarterly	2.385%
Right to defer interest on one or more occasions for up to number of consecutive years		10 years
Percentage of principal amount required for redemption		100.00%
6.60% Long-Term Notes Due 2067 | Long Term Subordinated Debt | Subsequent Events
Debt Instrument [Line Items]
Reset quarterly interest rate				8.03%
4.868% Senior Notes Due 2044 | Senior Notes
Debt Instrument [Line Items]
Other invested assets, at fair value		4.868%
3.50% Senior Notes Due 2050 | Senior Notes
Debt Instrument [Line Items]
Other invested assets, at fair value		3.50%
3.125% Senior Notes Due 2052 | Senior Notes
Debt Instrument [Line Items]
Other invested assets, at fair value		3.125%