INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	$ (355)
Balance, end of period	(368)
Balance, beginning of period	(5)	$ (5)
(Addition to) release of allowance for credit losses	0	0
Write-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Balance, end of period	(5)	(5)
Balance, beginning of period	0	0
(Addition to) release of allowance for credit losses	0	0
Write-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Balance, end of period	0	0
Balance, beginning of period	(375)	(295)
(Addition to) release of allowance for credit losses	(55)	(7)
Write-offs, net of recoveries	38	50
Change in foreign exchange	0	0
Balance, end of period	(392)	(252)
Other Loans and Loan Commitments
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(17)	(16)
(Addition to) release of allowance for credit losses	(2)	1
Write-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Balance, end of period	(19)	(15)
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(199)	(112)
(Addition to) release of allowance for credit losses	(28)	(2)
Write-offs, net of recoveries	24	0
Change in foreign exchange	0	0
Balance, end of period	(203)	(114)
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(14)	(16)
(Addition to) release of allowance for credit losses	(1)	(3)
Write-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Balance, end of period	(15)	(19)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(140)	(146)
(Addition to) release of allowance for credit losses	(24)	(3)
Write-offs, net of recoveries	14	50
Change in foreign exchange	0	0
Balance, end of period	$ (150)	$ (99)