LOANS - Corporate Loan Delinquency and Non-Accruals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loans receivable
Total loans	$ 694,488	$ 689,362
Loans held at fair value	8,040	7,594
Unallocated portfolio layer cumulative basis adjustments	(72)
Lease financing
Loans receivable
Total loans	$ 300	300
Corporate
Loans receivable
Number of days past due, non-accrual status	90 days
Total loans past due and accruing	$ 313	594
Loans, total non-accrual	1,377	1,882
Total loans	301,386	300,165
Loans held at fair value	7,759	7,281
Loans held at fair value, excluding accrued interest	$ 301,458	300,072
Loans less than this number of days past due are considered current	30 days
Unallocated portfolio layer cumulative basis adjustments	$ (72)	93
Corporate | Commercial and industrial
Loans receivable
Total loans past due and accruing	218	426
Loans, total non-accrual	542	717
Total loans	148,674	151,451
Corporate | Financial institutions
Loans receivable
Total loans past due and accruing	8	16
Loans, total non-accrual	73	51
Total loans	68,378	65,060
Corporate | Mortgage and real estate
Loans receivable
Total loans past due and accruing	8	69
Loans, total non-accrual	567	868
Total loans	26,546	24,938
Corporate | Lease financing
Loans receivable
Total loans past due and accruing	1	0
Loans, total non-accrual	0	0
Total loans	276	275
Corporate | Other
Loans receivable
Total loans past due and accruing	78	83
Loans, total non-accrual	195	246
Total loans	49,825	51,067
Corporate | 30–89 days past due
Loans receivable
Total loans past due and accruing	259	449
Corporate | 30–89 days past due | Commercial and industrial
Loans receivable
Total loans past due and accruing	183	308
Corporate | 30–89 days past due | Financial institutions
Loans receivable
Total loans past due and accruing	8	9
Corporate | 30–89 days past due | Mortgage and real estate
Loans receivable
Total loans past due and accruing	6	66
Corporate | 30–89 days past due | Lease financing
Loans receivable
Total loans past due and accruing	0	0
Corporate | 30–89 days past due | Other
Loans receivable
Total loans past due and accruing	62	66
Corporate | 90+ days past due
Loans receivable
Total loans past due and accruing	54	145
Corporate | 90+ days past due | Commercial and industrial
Loans receivable
Total loans past due and accruing	35	118
Corporate | 90+ days past due | Financial institutions
Loans receivable
Total loans past due and accruing	0	7
Corporate | 90+ days past due | Mortgage and real estate
Loans receivable
Total loans past due and accruing	2	3
Corporate | 90+ days past due | Lease financing
Loans receivable
Total loans past due and accruing	1	0
Corporate | 90+ days past due | Other
Loans receivable
Total loans past due and accruing	16	17
Corporate | Current
Loans receivable
Total loans	292,009	290,315
Corporate | Current | Commercial and industrial
Loans receivable
Total loans	147,914	150,308
Corporate | Current | Financial institutions
Loans receivable
Total loans	68,297	64,993
Corporate | Current | Mortgage and real estate
Loans receivable
Total loans	25,971	24,001
Corporate | Current | Lease financing
Loans receivable
Total loans	275	275
Corporate | Current | Other
Loans receivable
Total loans	$ 49,552	$ 50,738