GUARANTEES AND COMMITMENTS - Performance Risk (Details) - USD ($) $ in Billions	Jun. 30, 2023	Dec. 31, 2022
Guarantor Obligations
Maximum potential amount of future payments	$ 390.2	$ 386.1
Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	96.0	99.8
Investment grade
Guarantor Obligations
Maximum potential amount of future payments	74.1	77.9
Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	18.6	18.9
Not rated
Guarantor Obligations
Maximum potential amount of future payments	3.3	3.0
Financial standby letters of credit
Guarantor Obligations
Maximum potential amount of future payments	84.6	89.6
Financial standby letters of credit | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	84.6	89.6
Financial standby letters of credit | Investment grade
Guarantor Obligations
Maximum potential amount of future payments	73.0	77.9
Financial standby letters of credit | Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	10.1	10.4
Financial standby letters of credit | Not rated
Guarantor Obligations
Maximum potential amount of future payments	1.5	1.3
Loans sold with recourse
Guarantor Obligations
Maximum potential amount of future payments	1.8	1.7
Loans sold with recourse | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	1.8	1.7
Loans sold with recourse | Investment grade
Guarantor Obligations
Maximum potential amount of future payments	0.0	0.0
Loans sold with recourse | Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	0.0	0.0
Loans sold with recourse | Not rated
Guarantor Obligations
Maximum potential amount of future payments	1.8	1.7
Other
Guarantor Obligations
Maximum potential amount of future payments	9.6	8.5
Other | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	9.6	8.5
Other | Investment grade
Guarantor Obligations
Maximum potential amount of future payments	1.1	0.0
Other | Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	8.5	8.5
Other | Not rated
Guarantor Obligations
Maximum potential amount of future payments	$ 0.0	$ 0.0