GUARANTEES AND COMMITMENTS - Guarantees (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Maximum potential amount of future payments
Expire within 1 year	$ 240,100	$ 395,900
Expire after 1 year	125,600	127,500
Total amount outstanding	365,700	523,400
Carrying value	976	964
Cash collateral available to reimburse losses realized under guarantees and indemnifications	53,100	49,000
Securities and other marketable assets held as collateral	77,500	62,500
Letters of credit in favor of the Company held as collateral	2,800	3,100
Financial standby letters of credit
Maximum potential amount of future payments
Expire within 1 year	15,400	15,500
Expire after 1 year	63,500	63,500
Total amount outstanding	78,900	79,000
Carrying value	500	546
Performance guarantees
Maximum potential amount of future payments
Expire within 1 year	4,400	4,200
Expire after 1 year	5,800	5,800
Total amount outstanding	10,200	10,000
Carrying value	29	27
Derivative instruments considered to be guarantees
Maximum potential amount of future payments
Expire within 1 year	21,800	15,800
Expire after 1 year	25,900	27,300
Total amount outstanding	47,700	43,100
Carrying value	372	332
Loans sold with recourse
Maximum potential amount of future payments
Expire within 1 year	0	0
Expire after 1 year	1,000	1,000
Total amount outstanding	1,000	1,000
Carrying value	0	0
Repurchase reserve for consumer mortgages representations and warranties	13	12
Securities lending indemnifications
Maximum potential amount of future payments
Expire within 1 year	113,500	96,300
Expire after 1 year	0	0
Total amount outstanding	113,500	96,300
Carrying value	0	0
Credit card merchant processing
Maximum potential amount of future payments
Expire within 1 year	79,500	124,300
Expire after 1 year	0	0
Total amount outstanding	79,500	124,300
Carrying value	0	0
Credit card arrangements with partners
Maximum potential amount of future payments
Expire within 1 year	700	200
Expire after 1 year	21,000	21,500
Total amount outstanding	21,700	21,700
Carrying value	2	2
Guarantees under the Fixed Income Clearing Corporation sponsored member repo program
Maximum potential amount of future payments
Expire within 1 year	4,800	139,500
Expire after 1 year	0	0
Total amount outstanding	4,800	139,500
Carrying value	0	0
Other
Maximum potential amount of future payments
Expire within 1 year	0	100
Expire after 1 year	8,400	8,400
Total amount outstanding	8,400	8,500
Carrying value	$ 73	$ 57