CONCENTRATIONS OF CREDIT RISK (Details) - Total investments - Geographic - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
U.S.
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	$ 517.2	$ 431.6
Germany
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	39.8	48.3
Mexico
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	32.8	31.1
Japan
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	29.6	40.0
U.K.
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	23.8	31.7
State and Municipalities
Concentration Risk [Line Items]
Credit exposure from investment securities, loans and trading assets	$ 17.6	$ 20.1