GUARANTEES AND COMMITMENTS - Guarantees (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Maximum potential amount of future payments
Expire within 1 year	$ 435,200	$ 317,400
Expire after 1 year	98,500	94,700
Total amount outstanding	533,700	412,100
Carrying value	1,040	1,156
Cash collateral available to reimburse losses realized under guarantees and indemnifications	53,500	52,500
Securities and other marketable assets held as collateral	71,300	67,700
Letters of credit in favor of the Company held as collateral	3,200	3,100
Financial standby letters of credit
Maximum potential amount of future payments
Expire within 1 year	17,600	17,800
Expire after 1 year	61,500	63,500
Total amount outstanding	79,100	81,300
Carrying value	653	674
Performance guarantees
Maximum potential amount of future payments
Expire within 1 year	4,400	4,800
Expire after 1 year	5,700	5,800
Total amount outstanding	10,100	10,600
Carrying value	33	49
Derivative instruments considered to be guarantees
Maximum potential amount of future payments
Expire within 1 year	45,700	24,200
Expire after 1 year	22,500	16,300
Total amount outstanding	68,200	40,500
Carrying value	306	362
Loans sold with recourse
Maximum potential amount of future payments
Expire within 1 year	0	600
Expire after 1 year	1,000	1,200
Total amount outstanding	1,000	1,800
Carrying value	0	16
Repurchase reserve for consumer mortgages representations and warranties	12	11
Securities lending indemnifications
Maximum potential amount of future payments
Expire within 1 year	108,100	104,100
Expire after 1 year	0	0
Total amount outstanding	108,100	104,100
Carrying value	0	0
Credit card merchant processing
Maximum potential amount of future payments
Expire within 1 year	123,800	138,000
Expire after 1 year	0	0
Total amount outstanding	123,800	138,000
Carrying value	0	0
Credit card arrangements with partners
Maximum potential amount of future payments
Expire within 1 year	200	200
Expire after 1 year	100	200
Total amount outstanding	300	400
Carrying value	4	5
Guarantees under the Fixed Income Clearing Corporation sponsored member repo program
Maximum potential amount of future payments
Expire within 1 year	135,300	27,700
Expire after 1 year	0	0
Total amount outstanding	135,300	27,700
Carrying value	0	0
Other
Maximum potential amount of future payments
Expire within 1 year	100	0
Expire after 1 year	7,700	7,700
Total amount outstanding	7,800	7,700
Carrying value	$ 44	$ 50