INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period			$ (274)
(Addition to) release of allowance for credit losses	$ (21)	$ (2)	(28)	$ (33)
Balance, end of period	(238)		(238)
Balance, beginning of period	(5)	(6)	(5)	(7)
(Addition to) release of allowance for credit losses	0	0	0	1
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	1	0	1
Balance, end of period	(5)	(5)	(5)	(5)
Balance, beginning of period	0	0	0	0
(Addition to) release of allowance for credit losses	0	0	0	0
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	0	0	0	0
Balance, beginning of period	(252)	(250)	(295)	(223)
(Addition to) release of allowance for credit losses	(19)	(1)	(26)	(28)
Write-offs, net of recoveries	15	0	65	0
Change in foreign exchange	0	1	0	1
Balance, end of period	(256)	(250)	(256)	(250)
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(114)	(65)	(112)	(54)
(Addition to) release of allowance for credit losses	(24)	(11)	(26)	(22)
Write-offs, net of recoveries	15	0	15	0
Change in foreign exchange	0	0	0	0
Balance, end of period	(123)	(76)	(123)	(76)
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(19)	(9)	(16)	(9)
(Addition to) release of allowance for credit losses	2	0	(1)	0
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	(17)	(9)	(17)	(9)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(99)	(149)	(146)	(129)
(Addition to) release of allowance for credit losses	1	9	(2)	(11)
Write-offs, net of recoveries	0	0	50	0
Change in foreign exchange	0	0	0	0
Balance, end of period	(98)	(140)	(98)	(140)
Other loans and loan commitments
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(15)	(21)	(16)	(24)
(Addition to) release of allowance for credit losses	2	1	3	4
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	$ (13)	$ (20)	$ (13)	$ (20)