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CONCENTRATIONS OF CREDIT RISK (Details) - Total investments - Geographic - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
U.S.    
Concentration Risk [Line Items]    
Credit exposure from investment securities, loans and trading assets $ 370.1 $ 250.9
GERMANY    
Concentration Risk [Line Items]    
Credit exposure from investment securities, loans and trading assets 51.8 29.8
JAPAN    
Concentration Risk [Line Items]    
Credit exposure from investment securities, loans and trading assets 35.5 33.3
State and Municipalities    
Concentration Risk [Line Items]    
Credit exposure from investment securities, loans and trading assets $ 24.4 $ 31.4