INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	$ (192)
(Addition to) release of allowance for credit losses	146		$ 18	$ (6)
Balance, end of period	(274)		(192)
Balance, beginning of period	(7)
(Addition to) release of allowance for credit losses	(1)		0	(1)
Balance, end of period	(5)		(7)
Balance, beginning of period	0
(Addition to) release of allowance for credit losses	0		0	(38)
Balance, end of period	0		0
Balance, beginning of period	(8)
Balance, end of period	(10)		(8)
Balance, beginning of period	(223)		(213)	(263)
(Addition to) release of allowance for credit losses	(139)	[1]	(17)	37
Write-offs, net of recoveries	66		6	12
Change in foreign exchange	1			1
Balance, end of period	(295)		(223)	(213)
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(54)		(68)	(63)
(Addition to) release of allowance for credit losses	(124)	[1]	14	(5)
Write-offs, net of recoveries	66		0	0
Change in foreign exchange	0		0	0
Balance, end of period	(112)		(54)	(68)
Allowance for credit loss accounted for as purchased financial assets with credit deterioration	4
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(9)		(10)	(32)
(Addition to) release of allowance for credit losses	(7)	[1]	1	22
Write-offs, net of recoveries	0		0	0
Change in foreign exchange	0		0	0
Balance, end of period	(16)		(9)	(10)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(129)		(96)	(85)
(Addition to) release of allowance for credit losses	(17)	[1]	(39)	(11)
Write-offs, net of recoveries	0		6	0
Change in foreign exchange	0		0	0
Balance, end of period	(146)		(129)	(96)
Other loans and loan commitments
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(24)		(31)	(35)
(Addition to) release of allowance for credit losses	8	[1]	7	4
Write-offs, net of recoveries	0		0	0
Change in foreign exchange	0		0	0
Balance, end of period	(16)		(24)	(31)
Held-to-maturity securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(7)		(8)	(10)
(Addition to) release of allowance for credit losses	1	[1]	0	1
Write-offs, net of recoveries	0		0	0
Change in foreign exchange	1		1	1
Balance, end of period	(5)		(7)	(8)
Available-for-sale securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	0		0	(38)
(Addition to) release of allowance for credit losses	0	[1]	0	26
Write-offs, net of recoveries	0		0	12
Change in foreign exchange	0		0	0
Balance, end of period	$ 0		$ 0	$ 0

[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.