INVESTMENTS - Realized Investment Gains (Losses), Net (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]
Unrealized gains (losses) on investments	$ (84)	$ (75)	$ (166)	$ 109
Realized gains (losses) on investments	(63)	(212)	(302)	(231)
Investment losses, net	(147)	(287)	(468)	(122)
Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(80)	(61)	(152)	95
Realized gains (losses) on investments	(99)	(341)	(452)	(467)
Investment losses, net	(179)	(402)	(604)	(372)
Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(4)	(14)	(14)	14
Realized gains (losses) on investments	36	129	150	236
Investment losses, net	32	115	136	250
Fixed maturity securities
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(79)	(73)	(166)	104
Realized gains (losses) on investments	(1)	(10)	0	(36)
Investment losses, net	(80)	(83)	(166)	68
Fixed maturity securities | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(75)	(61)	(152)	95
Realized gains (losses) on investments	(1)	(2)	0	(28)
Investment losses, net	(76)	(63)	(152)	67
Fixed maturity securities | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(4)	(12)	(14)	9
Realized gains (losses) on investments	0	(8)	0	(8)
Investment losses, net	(4)	(20)	(14)	1
Mortgage loans
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(5)		0
Realized gains (losses) on investments	2		2
Investment losses, net	(3)		2
Mortgage loans | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(5)		0
Realized gains (losses) on investments	2		2
Investment losses, net	(3)		2
Mortgage loans | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0		0
Realized gains (losses) on investments	0		0
Investment losses, net	0		0
Equity securities
Net Investment Income [Line Items]
Unrealized gains (losses) on investments		(2)		5
Realized gains (losses) on investments		0		0
Investment losses, net		(2)		5
Equity securities | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments		0		0
Realized gains (losses) on investments		0		0
Investment losses, net		0		0
Equity securities | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments		(2)		5
Realized gains (losses) on investments		0		0
Investment losses, net		(2)		5
Derivative instruments
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0	0	0
Realized gains (losses) on investments	(64)	(202)	(304)	(195)
Investment losses, net	(64)	(202)	(304)	(195)
Derivative instruments | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0	0	0
Realized gains (losses) on investments	(100)	(339)	(454)	(439)
Investment losses, net	(100)	(339)	(454)	(439)
Derivative instruments | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0	0	0
Realized gains (losses) on investments	36	137	150	244
Investment losses, net	$ 36	$ 137	$ 150	$ 244