INVESTMENTS - Realized Investment Gains (Losses), Net (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	$ (75)	$ (254)		$ 109
Realized gains (losses) on investments	(212)	(1,044)		(231)
Investment gains (losses), net	(287)	(1,298)	$ 481	(122)
Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(61)	(295)		95
Realized gains (losses) on investments	(341)	187		(467)
Investment gains (losses), net	(402)	(108)		(372)
Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(14)	41		14
Realized gains (losses) on investments	129	(1,231)		236
Investment gains (losses), net	115	(1,190)		250
Fixed maturity securities
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(73)	(235)		104
Realized gains (losses) on investments	(10)	(409)		(36)
Investment gains (losses), net	(83)	(644)	(21)	68
Fixed maturity securities | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(61)	(295)		95
Realized gains (losses) on investments	(2)	(71)		(28)
Investment gains (losses), net	(63)	(366)		67
Fixed maturity securities | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(12)	60		9
Realized gains (losses) on investments	(8)	(338)		(8)
Investment gains (losses), net	(20)	(278)		1
Secured receivable
Net Investment Income [Line Items]
Unrealized gains (losses) on investments		0
Realized gains (losses) on investments		(51)
Investment gains (losses), net		(51)
Secured receivable | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments		0
Realized gains (losses) on investments		0
Investment gains (losses), net
Secured receivable | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments		0
Realized gains (losses) on investments		(51)
Investment gains (losses), net		(51)
Equity securities
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(2)	(19)		5
Realized gains (losses) on investments	0	0		0
Investment gains (losses), net	(2)	(19)		5
Equity securities | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0		0
Realized gains (losses) on investments	0	0		0
Investment gains (losses), net	0	0		0
Equity securities | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	(2)	(19)		5
Realized gains (losses) on investments	0	0		0
Investment gains (losses), net	(2)	(19)		5
Derivative instruments
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0		0
Realized gains (losses) on investments	(202)	(584)		(195)
Investment gains (losses), net	(202)	(584)	$ 502	(195)
Derivative instruments | Retained Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0		0
Realized gains (losses) on investments	(339)	258		(439)
Investment gains (losses), net	(339)	258		(439)
Derivative instruments | Ceded Business
Net Investment Income [Line Items]
Unrealized gains (losses) on investments	0	0		0
Realized gains (losses) on investments	137	(842)		244
Investment gains (losses), net	$ 137	$ (842)		$ 244