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INVESTMENTS - Mortgage Loan Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 35,650,926 $ 29,250,836
Financing receivable, before allowance for credit loss, to total, percent 100.00% 100.00%
Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 29,519,752 $ 22,549,676
Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 36.20% 38.70%
Residential | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 10,688,972 $ 8,724,904
Office building    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 15.60% 18.60%
Office building | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 4,594,238 $ 4,185,146
Apartment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 32.90% 27.50%
Apartment | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 9,698,728 $ 6,194,819
Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 10.60% 8.80%
Industrial | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 3,139,163 $ 1,981,713
Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 2.10% 3.50%
Retail | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 630,455 $ 780,071
Other property types    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 2.00% 2.10%
Other property types | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 582,479 $ 483,560
Warehouse    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 0.60% 0.80%
Warehouse | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 185,717 $ 199,463
Pacific    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 24.40% 29.60%
Pacific | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 7,197,110 $ 6,675,064
West South Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 12.10% 11.90%
West South Central | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 3,582,648 $ 2,675,890
South Atlantic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 27.30% 22.20%
South Atlantic | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 8,051,653 $ 4,996,043
Middle Atlantic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 12.20% 13.90%
Middle Atlantic | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 3,590,530 $ 3,142,973
East North Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 4.20% 2.60%
East North Central | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 1,240,264 $ 590,911
Mountain    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 10.70% 8.70%
Mountain | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 3,152,895 $ 1,957,099
New England    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 4.80% 4.90%
New England | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 1,414,897 $ 1,099,157
East South Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 2.40% 4.60%
East South Central | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 712,886 $ 1,035,764
West North Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 1.20% 1.60%
West North Central | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 349,079 $ 350,546
Other regions    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, before allowance for credit loss, to total, percent 0.70% 0.00%
Other regions | Residential And Commercial Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 227,790 $ 26,229