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SIGNIFICANT ACCOUNTING POLICIES - Investments and Commercial and Agricultural Mortgage Loans on Real Estate (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]    
Carrying value of COLI $ 962 $ 942
Real estate held for the production of income | Minimum    
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]    
Real estate held for the production of income, useful lives 40 years  
Real estate held for the production of income | Maximum    
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]    
Real estate held for the production of income, useful lives 50 years