INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023		Sep. 30, 2024	Sep. 30, 2023
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period				$ (274)
Balance, end of period	$ (284)			(284)
Balance, beginning of period	(5)	$ (5)		(5)	$ (7)
(Addition to) release of allowance for credit losses	0	1	[1]	0	1	[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	[1]	0	0	[1]
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	(256)	(250)		(295)	(223)
(Addition to) release of allowance for credit losses	(89)	(33)	[1]	(115)	(62)	[1]
Write-offs, net of recoveries	42	0		107	0
Change in foreign exchange	0	(1)		0	1
Balance, end of period	(303)	(284)		(303)	(284)
Allowance for credit loss accounted for as purchased financial assets with credit deterioration		4			4
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(123)	(76)		(112)	(54)
(Addition to) release of allowance for credit losses	(67)	(35)	[1]	(93)	(57)	[1]
Write-offs, net of recoveries	39	0		54	0
Change in foreign exchange	0	0		0	0
Balance, end of period	(151)	(111)		(151)	(111)
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(17)	(9)		(16)	(9)
(Addition to) release of allowance for credit losses	(16)	(3)	[1]	(17)	(3)	[1]
Write-offs, net of recoveries	3	0		3	0
Change in foreign exchange	0	0		0	0
Balance, end of period	(30)	(12)		(30)	(12)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(98)	(140)		(146)	(129)
(Addition to) release of allowance for credit losses	(5)	3	[1]	(7)	(8)	[1]
Write-offs, net of recoveries	0	0		50	0
Change in foreign exchange	0	0		0	0
Balance, end of period	(103)	(137)		(103)	(137)
Other loans and loan commitments
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(13)	(20)		(16)	(24)
(Addition to) release of allowance for credit losses	(1)	1	[1]	2	5	[1]
Write-offs, net of recoveries	0	0		0	0
Change in foreign exchange	0	0		0	0
Balance, end of period	$ (14)	$ (19)		$ (14)	$ (19)

[1] Includes an allowance for credit losses of $4 recognized on financial assets accounted for as purchased financial assets with credit deterioration that is not recorded in earnings upon recognition