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INVESTMENTS (Reverse Repurchase Agreements) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Value of reverse repurchase agreements $ 41 $ 91
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal (as a percent) 102.00%