INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	$ (174)
(Addition to) release of allowance for credit losses	18	$ (6)	$ 93
Balance, end of period	(192)	(174)
Balance, beginning of period	(8)
(Addition to) release of allowance for credit losses	0	(1)	(1)
Balance, end of period	(7)	(8)
Balance, beginning of period	0
(Addition to) release of allowance for credit losses	0	(38)	38
Balance, end of period	0	0
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(68)	(63)	(22)	[1]
Transition impact to retained earnings					$ (2)
(Addition to) release of allowance for credit losses	14	(5)	(39)
Write-offs, net of recoveries	0	0	0
Change in foreign exchange	0	0
Balance, end of period	(54)	(68)	(63)
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(10)	(32)	(3)	[1]
Transition impact to retained earnings					(8)
(Addition to) release of allowance for credit losses	1	22	(21)
Write-offs, net of recoveries	0	0	0
Change in foreign exchange	0	0
Balance, end of period	(9)	(10)	(32)
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period	(96)	(85)	(20)	[1]
Transition impact to retained earnings					(33)
(Addition to) release of allowance for credit losses	(39)	(11)	(41)
Write-offs, net of recoveries	6	0	9
Change in foreign exchange	0	0
Balance, end of period	(129)	(96)	(85)
Held-to-maturity securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Transition impact to retained earnings					(10)
Balance, beginning of period	(8)	(10)	0	[1]
(Addition to) release of allowance for credit losses	0	1	0
Write-offs, net of recoveries	0	0	0
Change in foreign exchange	1	1
Balance, end of period	(7)	(8)	(10)
Available-for-sale securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Transition impact to retained earnings					0
Balance, beginning of period	0	(38)	0	[1]
(Addition to) release of allowance for credit losses	0	26	(75)
Write-offs, net of recoveries	0	12	37
Change in foreign exchange	0	0
Balance, end of period	0	0	(38)
Reinsurance recoverables
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Transition impact to retained earnings					$ (11)
Balance, beginning of period	(13)	(12)	0	[1]
(Addition to) release of allowance for credit losses	2	(2)	(1)
Write-offs, net of recoveries	0	0	0
Change in foreign exchange	3	1
Balance, end of period	$ (8)	$ (13)	$ (12)

[1] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.