CONCENTRATIONS OF CREDIT RISK (Details) - Total investments - Geographic - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
U.S.
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	$ 431.6	$ 414.5
Germany
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	48.3	48.9
Japan
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	40.0	30.1
United Kingdom
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	31.7	31.1
State and Municipalities
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	$ 20.1	$ 22.0