INVESTMENTS - Troubled Debt Restructuring (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023	Dec. 31, 2027
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of mortgage loans on real estate, interest rate	0.35%
Forecast
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of mortgage loans on real estate, interest rate		5.00%
Commercial mortgages:
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, troubled debt restructuring	$ 56

Amount of financing receivable modified as troubled debt restructuring.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant