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INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net Investment Income [Line Items]
Gross investment income	$ 94	$ 85	$ 185	$ 172
Less: investment expenses	(19)	(7)	(40)	(18)
Net investment income	75	78	145	154
Retained Business
Net Investment Income [Line Items]
Gross investment income	78	65	155	130
Less: investment expenses	(19)	(7)	(40)	(16)
Net investment income	59	58	115	114
Ceded Business
Net Investment Income [Line Items]
Gross investment income	16	20	30	42
Less: investment expenses	0	0	0	(2)
Net investment income	16	20	30	40
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	75	64	147	125
Fixed maturity securities \| Retained Business
Net Investment Income [Line Items]
Gross investment income	62	51	122	98
Fixed maturity securities \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	13	13	25	27
Equity securities
Net Investment Income [Line Items]
Gross investment income		1		2
Equity securities \| Retained Business
Net Investment Income [Line Items]
Gross investment income		0		0
Equity securities \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		1		2
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	8	4	16	8
Mortgage loans \| Retained Business
Net Investment Income [Line Items]
Gross investment income	8	4	16	8
Mortgage loans \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	0	0	0	0
Other invested assets
Net Investment Income [Line Items]
Gross investment income	1	7	2	20
Other invested assets \| Retained Business
Net Investment Income [Line Items]
Gross investment income	0	7	3	19
Other invested assets \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	1	0	(1)	1
Short-term investments and cash equivalents
Net Investment Income [Line Items]
Gross investment income	10	9	20	17
Short-term investments and cash equivalents \| Retained Business
Net Investment Income [Line Items]
Gross investment income	8	3	14	5
Short-term investments and cash equivalents \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	2	6	6	12
Repurchase agreements
Net Investment Income [Line Items]
Less: investment expenses	$ (18)	$ (4)
Repurchase agreements \| Retained Business
Net Investment Income [Line Items]
Less: investment expenses			$ (33)	$ (9)