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COMMERCIAL MORTGAGE LOANS - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
troubled_debt_restructuring
loan
Sep. 30, 2019
USD ($)
troubled_debt_restructuring
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]          
Commercial mortgage loans on real estate, net $ 9,765,312,000   $ 9,765,312,000   $ 9,379,401,000
Write-offs 0   0    
Increase in allowance for credit loss on mortgage loans due to deterioration in macroeconomic forecasts as a result of COVID-19     99,100,000    
Commercial Mortgage Loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Commercial mortgage loans, before allowance for credit losses 9,940,362,000   9,940,362,000    
Commercial mortgage loans on real estate, net 9,765,312,000   $ 9,765,312,000    
Mortgage call option period     10 years    
Amount that would become due in remainder of 2020, if loans are called at their next call dates 8,100,000   $ 8,100,000    
Amount that would become due in 2021 through 2025, if loans are called at their next call dates 763,700,000   763,700,000    
Amount that would become due in 2026 through 2030, if loans are called at their next call dates 56,700,000   56,700,000    
Mortgage loans having participation feature 805,200,000   805,200,000   $ 717,000,000.0
Income recognized on participating mortgage loans 900,000 $ 17,300,000 3,800,000 $ 18,000,000.0  
Loans not subject to pooling and servicing agreement, non performing or restructured amount 1,200,000 $ 3,200,000 $ 1,200,000 $ 3,200,000  
Number of troubled debt restructurings | troubled_debt_restructuring     2 4  
Write-offs 0   $ 0    
Commercial Mortgage Loans | CARES Act, Loan Modification Program          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Commercial mortgage loans, before allowance for credit losses $ 2,200,000,000   $ 2,200,000,000    
Number of loans modified and not considered troubled debt restructuring | loan 308   308    
Maximum | Commercial Mortgage Loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loan-to-value ratio with participating interest (as a percent) 85.00%   85.00%