GUARANTEES AND COMMITMENTS - Performance Risk (Details) - USD ($) $ in Billions	Mar. 31, 2023	Dec. 31, 2022
Guarantor Obligations
Maximum potential amount of future payments	$ 394.4	$ 386.1
Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	101.3	100.4
Investment grade
Guarantor Obligations
Maximum potential amount of future payments	78.0	77.9
Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	18.8	18.9
Not rated
Guarantor Obligations
Maximum potential amount of future payments	4.5	3.6
Financial standby letters of credit
Guarantor Obligations
Maximum potential amount of future payments	90.5	89.6
Financial standby letters of credit | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	90.5	89.6
Financial standby letters of credit | Investment grade
Guarantor Obligations
Maximum potential amount of future payments	78.0	77.9
Financial standby letters of credit | Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	10.2	10.4
Financial standby letters of credit | Not rated
Guarantor Obligations
Maximum potential amount of future payments	2.3	1.3
Loans sold with recourse
Guarantor Obligations
Maximum potential amount of future payments	1.7	1.7
Loans sold with recourse | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	1.7	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	1.7	1.7
Credit card arrangements with partners
Guarantor Obligations
Maximum potential amount of future payments	0.5	0.6
Credit card arrangements with partners | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	0.5	0.6
Credit card arrangements with partners | Investment grade
Guarantor Obligations
Maximum potential amount of future payments	0.0	0.0
Credit card arrangements with partners | Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	0.0	0.0
Credit card arrangements with partners | Not rated
Guarantor Obligations
Maximum potential amount of future payments	0.5	0.6
Other
Guarantor Obligations
Maximum potential amount of future payments	8.6	8.5
Other | Classified based on internal and external credit ratings
Guarantor Obligations
Maximum potential amount of future payments	8.6	8.5
Other | Investment grade
Guarantor Obligations
Maximum potential amount of future payments	0.0	0.0
Other | Non-investment grade
Guarantor Obligations
Maximum potential amount of future payments	8.6	8.5
Other | Not rated
Guarantor Obligations
Maximum potential amount of future payments	$ 0.0	$ 0.0