INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		$ (180)
(Addition to) release of allowance for credit losses	[1]	0	$ 0		$ 18
Balance, end of period		(174)	(180)
Transitional real estate loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		(63)	(22)	[1]
Transition impact to retained earnings					(2)
(Addition to) release of allowance for credit losses		(5)	(39)
Write-offs, net of recoveries		0	0
Change in foreign exchange		0
Balance, end of period		(68)	(63)		(22)	[1]
Commercial mortgage loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		(32)	(3)	[1]
Transition impact to retained earnings					(8)
(Addition to) release of allowance for credit losses		22	(21)
Write-offs, net of recoveries		0	0
Change in foreign exchange		0
Balance, end of period		(10)	(32)		(3)	[1]
Middle market loans
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		(85)	(20)	[1]
Transition impact to retained earnings					(33)
(Addition to) release of allowance for credit losses		(11)	(41)
Write-offs, net of recoveries		0	9
Change in foreign exchange		0
Balance, end of period		(96)	(85)		(20)	[1]
Held-to-maturity securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		(10)	0	[1]
Transition impact to retained earnings					(10)
(Addition to) release of allowance for credit losses		1	0
Write-offs, net of recoveries		0	0
Change in foreign exchange		1
Balance, end of period		(8)	(10)		0	[1]
Available-for-sale securities
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		(38)	0	[1]
Transition impact to retained earnings					0
(Addition to) release of allowance for credit losses		26	(75)
Write-offs, net of recoveries		12	37
Change in foreign exchange		0
Balance, end of period		0	(38)		0	[1]
Reinsurance recoverables
Allowance for Loan Losses by Portfolio Segment [Roll Forward]
Balance, beginning of period		(12)	0	[1]
Transition impact to retained earnings					(11)
(Addition to) release of allowance for credit losses		(2)	(1)
Write-offs, net of recoveries		0	0
Change in foreign exchange		1
Balance, end of period		$ (13)	$ (12)		$ 0	[1]

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