NET INVESTMENT-RELATED GAINS (LOSSES) - INSURANCE - Allowance for Credit Losses, Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 400,162	$ 303,900	$ 374,077	$ 120,259
Net provision (release)	12,298	(2,337)	38,383	181,304
Loans purchased with credit deterioration		1,637		1,637
Charge-offs	(575)	(5,274)	(575)	(5,274)
Balance, end of period	411,885	297,926	411,885	297,926
Commercial mortgage loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	81,536	80,056	65,970	58,203
Net provision (release)	22,408	(21,801)	37,974	52
Loans purchased with credit deterioration		0		0
Charge-offs	0	0	0	0
Balance, end of period	103,944	58,255	103,944	58,255
Residential mortgage loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	87,583	78,739	72,082	62,056
Net provision (release)	8,611	(3,002)	24,112	13,681
Loans purchased with credit deterioration		799		799
Charge-offs	0	0	0	0
Balance, end of period	96,194	76,536	96,194	76,536
Consumer and other loan receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	231,043	145,105	236,025	0
Net provision (release)	(18,721)	22,466	(23,703)	167,571
Loans purchased with credit deterioration		838		838
Charge-offs	(575)	(5,274)	(575)	(5,274)
Balance, end of period	$ 211,747	$ 163,135	$ 211,747	$ 163,135