LOANS - Corporate Loan Delinquency and Non-Accruals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans receivable
Total loans	$ 657,221	$ 667,767
Loans held at fair value	5,360	6,082
Lease financing
Loans receivable
Total loans	$ 400	500
Corporate
Loans receivable
Number of days past due, non-accrual status	90 days
Number of days past due for reversal of accrued interest and charging to earnings	90 days
Total loans past due and accruing	$ 1,898	1,895
Loans, total non-accrual	1,122	1,553
Total loans	289,154	291,233
Loans held at fair value	$ 5,123	6,070
Loans less than this number of days past due are considered current	30 days
Corporate | Commercial and industrial
Loans receivable
Total loans past due and accruing	$ 1,357	1,311
Loans, total non-accrual	860	1,263
Total loans	147,803	147,004
Corporate | Financial institutions
Loans receivable
Total loans past due and accruing	335	486
Loans, total non-accrual	152	2
Total loans	64,907	71,767
Corporate | Mortgage and real estate
Loans receivable
Total loans past due and accruing	42	2
Loans, total non-accrual	33	136
Total loans	21,949	20,291
Corporate | Lease financing
Loans receivable
Total loans past due and accruing	1	0
Loans, total non-accrual	10	14
Total loans	354	455
Corporate | Other
Loans receivable
Total loans past due and accruing	163	96
Loans, total non-accrual	67	138
Total loans	49,018	45,646
Corporate | 30 to 89 days past due
Loans receivable
Total loans past due and accruing	1,171	1,470
Corporate | 30 to 89 days past due | Commercial and industrial
Loans receivable
Total loans past due and accruing	763	1,072
Corporate | 30 to 89 days past due | Financial institutions
Loans receivable
Total loans past due and accruing	233	320
Corporate | 30 to 89 days past due | Mortgage and real estate
Loans receivable
Total loans past due and accruing	30	1
Corporate | 30 to 89 days past due | Lease financing
Loans receivable
Total loans past due and accruing	0	0
Corporate | 30 to 89 days past due | Other
Loans receivable
Total loans past due and accruing	145	77
Corporate | Equal to greater than 90 days past due
Loans receivable
Total loans past due and accruing	727	425
Corporate | Equal to greater than 90 days past due | Commercial and industrial
Loans receivable
Total loans past due and accruing	594	239
Corporate | Equal to greater than 90 days past due | Financial institutions
Loans receivable
Total loans past due and accruing	102	166
Corporate | Equal to greater than 90 days past due | Mortgage and real estate
Loans receivable
Total loans past due and accruing	12	1
Corporate | Equal to greater than 90 days past due | Lease financing
Loans receivable
Total loans past due and accruing	1	0
Corporate | Equal to greater than 90 days past due | Other
Loans receivable
Total loans past due and accruing	18	19
Corporate | Current
Loans receivable
Total loans	281,011	281,715
Corporate | Current | Commercial and industrial
Loans receivable
Total loans	145,586	144,430
Corporate | Current | Financial institutions
Loans receivable
Total loans	64,420	71,279
Corporate | Current | Mortgage and real estate
Loans receivable
Total loans	21,874	20,153
Corporate | Current | Lease financing
Loans receivable
Total loans	343	441
Corporate | Current | Other
Loans receivable
Total loans	$ 48,788	$ 45,412