INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period			$ (355)
Balance, end of period	$ (422)		(422)
Balance, beginning of period	(5)	$ (5)	(5)	$ (5)
(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	(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	(404)	(256)	(375)	(295)
(Addition to) release of allowance for credit losses	(53)	(89)	(167)	(115)
Write-offs, net of recoveries	13	42	98	107
Change in foreign exchange	0	0	0	0
Balance, end of period	(444)	(303)	(444)	(303)
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(243)	(123)	(199)	(112)
(Addition to) release of allowance for credit losses	(28)	(67)	(101)	(93)
Write-offs, net of recoveries	0	39	29	54
Change in foreign exchange	0	0	0	0
Balance, end of period	(271)	(151)	(271)	(151)
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(12)	(17)	(14)	(16)
(Addition to) release of allowance for credit losses	2	(16)	4	(17)
Write-offs, net of recoveries	0	3	0	3
Change in foreign exchange	0	0	0	0
Balance, end of period	(10)	(30)	(10)	(30)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(127)	(98)	(140)	(146)
(Addition to) release of allowance for credit losses	(25)	(5)	(68)	(7)
Write-offs, net of recoveries	13	0	69	50
Change in foreign exchange	0	0	0	0
Balance, end of period	(139)	(103)	(139)	(103)
Other Loans and Loan Commitments
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(17)	(13)	(17)	(16)
(Addition to) release of allowance for credit losses	(2)	(1)	(2)	2
Write-offs, net of recoveries	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, end of period	$ (19)	$ (14)	$ (19)	$ (14)