INVESTMENTS - Mortgage and Other Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	$ 35,650,926	$ 29,250,836
Allowance for credit losses	(560,228)	(374,077)	$ (120,259)
Total mortgage and other loan receivables, net of allowance for loan losses	35,090,698	28,876,759
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	18,830,780	13,824,772
Allowance for credit losses	(227,315)	(65,970)	(58,203)
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	10,688,972	8,724,904
Allowance for credit losses	(125,825)	(72,082)	$ (62,056)
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	5,228,534	5,617,925
Other Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	902,640	1,083,235
Other Portfolio Segment | Aircraft
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	282,300	850,100
Commercial mortgage loan, fair value option | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables	787,500	805,400
Total mortgage and other loan receivables, net of allowance for loan losses	871,200	794,100
Related party loans, fair value option
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables, net of allowance for loan losses		27,300
Related party loans, fair value option | Other Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total mortgage and other loan receivables		27,300
Purchase-Credit Deteriorated Mortgage and Other Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ (106,200)	$ (77,900)