LOANS - Performance of Modified Consumer Loans (Details) - Consumer - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
In North America offices
Loans receivable
Total modified loans balance	$ 1,559	$ 1,238
Gross credit losses	293	205
In North America offices | Current
Loans receivable
Total modified loans balance	1,144	836
In North America offices | 30–89 days past due
Loans receivable
Total modified loans balance	232	203
In North America offices | 90+ days past due
Loans receivable
Total modified loans balance	183	199
Outside U.S.
Loans receivable
Total modified loans balance	84	404
Gross credit losses	1	5
Outside U.S. | Current
Loans receivable
Total modified loans balance	74	392
Outside U.S. | 30–89 days past due
Loans receivable
Total modified loans balance	7	8
Outside U.S. | 90+ days past due
Loans receivable
Total modified loans balance	3	4
Residential first mortgages | In North America offices
Loans receivable
Total modified loans balance	99	164
Gross credit losses	0	0
Residential first mortgages | In North America offices | Current
Loans receivable
Total modified loans balance	40	70
Residential first mortgages | In North America offices | 30–89 days past due
Loans receivable
Total modified loans balance	19	22
Residential first mortgages | In North America offices | 90+ days past due
Loans receivable
Total modified loans balance	40	72
Residential first mortgages | Outside U.S.
Loans receivable
Total modified loans balance	37	334
Gross credit losses	0	0
Residential first mortgages | Outside U.S. | Current
Loans receivable
Total modified loans balance	34	331
Residential first mortgages | Outside U.S. | 30–89 days past due
Loans receivable
Total modified loans balance	2	2
Residential first mortgages | Outside U.S. | 90+ days past due
Loans receivable
Total modified loans balance	1	1
Home equity loans | In North America offices
Loans receivable
Total modified loans balance	3	21
Gross credit losses	0	0
Home equity loans | In North America offices | Current
Loans receivable
Total modified loans balance	1	14
Home equity loans | In North America offices | 30–89 days past due
Loans receivable
Total modified loans balance	0	1
Home equity loans | In North America offices | 90+ days past due
Loans receivable
Total modified loans balance	2	6
Total credit cards | In North America offices
Loans receivable
Total modified loans balance	1,432	1,039
Gross credit losses	291	204
Total credit cards | In North America offices | Current
Loans receivable
Total modified loans balance	1,081	740
Total credit cards | In North America offices | 30–89 days past due
Loans receivable
Total modified loans balance	211	179
Total credit cards | In North America offices | 90+ days past due
Loans receivable
Total modified loans balance	140	120
Total credit cards | Outside U.S.
Loans receivable
Total modified loans balance	17	43
Gross credit losses	0	4
Total credit cards | Outside U.S. | Current
Loans receivable
Total modified loans balance	16	37
Total credit cards | Outside U.S. | 30–89 days past due
Loans receivable
Total modified loans balance	1	3
Total credit cards | Outside U.S. | 90+ days past due
Loans receivable
Total modified loans balance	0	3
Personal, small business and other | In North America offices
Loans receivable
Total modified loans balance	25	14
Gross credit losses	2	1
Personal, small business and other | In North America offices | Current
Loans receivable
Total modified loans balance	22	12
Personal, small business and other | In North America offices | 30–89 days past due
Loans receivable
Total modified loans balance	2	1
Personal, small business and other | In North America offices | 90+ days past due
Loans receivable
Total modified loans balance	1	1
Personal, small business and other | Outside U.S.
Loans receivable
Total modified loans balance	30	27
Gross credit losses	1	1
Personal, small business and other | Outside U.S. | Current
Loans receivable
Total modified loans balance	24	24
Personal, small business and other | Outside U.S. | 30–89 days past due
Loans receivable
Total modified loans balance	4	3
Personal, small business and other | Outside U.S. | 90+ days past due
Loans receivable
Total modified loans balance	$ 2	$ 0