LOANS - Credit Quality Indicators (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Loans receivable
Loans, net of unearned income	$ 694,488	$ 689,362
Unallocated portfolio layer cumulative basis adjustments	(72)
Consumer
Loans receivable
Loans, net of unearned income	393,102	389,197
Unallocated portfolio layer cumulative basis adjustments	(224)
Consumer | In North America offices | 90+ days past due | Personal Banking and Wealth Management
Loans receivable
Loans, net of unearned income	25,900	29,200
Consumer | Outside U.S. | 90+ days past due | Personal Banking and Wealth Management
Loans receivable
Loans, net of unearned income	17,600
Consumer | Residential first mortgages
Loans receivable
Loans, net of unearned income	114,593	108,711
Consumer | Residential first mortgages | In offices outside North America
Loans receivable
Loans, net of unearned income	24,456	26,426
Consumer | Home equity loans
Loans receivable
Loans, net of unearned income	3,141	3,592
Consumer | Credit cards
Loans receivable
Loans, net of unearned income	170,497	164,110
Consumer | Credit cards | Outside U.S.
Loans receivable
Revolving loans converted to term loans	33	51
Consumer | Personal, small business and other
Loans receivable
Revolving loans converted to term loans	22	37
Loans, net of unearned income	$ 32,400	$ 35,258
Consumer | Personal, small business and other | In offices outside North America | Internal Investment Grade
Loans receivable
Percentage internal risk rating	83.00%	92.00%
Consumer | Less than or equal to 80%
Loans receivable
Loans, net of unearned income	$ 107,142	$ 101,290
Consumer | Less than or equal to 80% | Residential first mortgages
Loans receivable
2024	9,196	13,907
2023	13,973	17,736
2022	18,546	18,795
2021	18,247	16,094
2020	15,434	8,198
Prior	28,797	23,120
Loans, net of unearned income	104,193	97,850
Consumer | Less than or equal to 80% | Residential first mortgages | In offices outside North America
Loans receivable
2024	2,808	2,756
2023	2,406	3,229
2022	2,579	3,257
2021	2,505	2,286
2020	1,739	2,525
Prior	7,642	8,000
Loans, net of unearned income	$ 19,679	$ 22,053
Loan to value ratio	58.00%	55.00%
Consumer | Less than or equal to 80% | Home equity line of credit (pre-reset)
Loans receivable
Loans, net of unearned income	$ 2,514	$ 2,964
Consumer | Less than or equal to 80% | Home equity line of credit (post-reset)
Loans receivable
Loans, net of unearned income	435	476
Consumer | Less than or equal to 80% | Home equity loans
Loans receivable
Loans, net of unearned income	2,949	3,440
Consumer | 80% but less than or equal to 100%
Loans receivable
Loans, net of unearned income	8,742	9,119
Consumer | 80% but less than or equal to 100% | Residential first mortgages
Loans receivable
2024	3,550	3,769
2023	2,036	3,900
2022	2,078	728
2021	472	306
2020	226	191
Prior	351	191
Loans, net of unearned income	8,713	9,085
Consumer | 80% but less than or equal to 100% | Residential first mortgages | In offices outside North America
Loans receivable
2024	421	1,007
2023	654	807
2022	462	754
2021	426	454
2020	326	84
Prior	148	84
Loans, net of unearned income	2,437	3,190
Consumer | 80% but less than or equal to 100% | Home equity line of credit (pre-reset)
Loans receivable
Loans, net of unearned income	26	29
Consumer | 80% but less than or equal to 100% | Home equity line of credit (post-reset)
Loans receivable
Loans, net of unearned income	3	5
Consumer | 80% but less than or equal to 100% | Home equity loans
Loans receivable
Loans, net of unearned income	29	34
Consumer | Greater than 100%
Loans receivable
Loans, net of unearned income	158	207
Consumer | Greater than 100% | Residential first mortgages
Loans receivable
2024	1	3
2023	2	52
2022	42	33
2021	33	1
2020	1	26
Prior	25	23
Loans, net of unearned income	104	138
Consumer | Greater than 100% | Residential first mortgages | In offices outside North America
Loans receivable
2024	0	112
2023	412	439
2022	698	382
2021	657	62
2020	176	2
Prior	8	3
Loans, net of unearned income	1,951	1,000
Consumer | Greater than 100% | Home equity line of credit (pre-reset)
Loans receivable
Loans, net of unearned income	45	57
Consumer | Greater than 100% | Home equity line of credit (post-reset)
Loans receivable
Loans, net of unearned income	9	12
Consumer | Greater than 100% | Home equity loans
Loans receivable
Loans, net of unearned income	54	69
Consumer | LTV not available
Loans receivable
Loans, net of unearned income	1,692	1,687
Consumer | LTV not available | Residential first mortgages
Loans receivable
Loans, net of unearned income	1,583	1,638
Consumer | LTV not available | Residential first mortgages | In offices outside North America
Loans receivable
Loans, net of unearned income	389	183
Consumer | LTV not available | Home equity loans
Loans receivable
Loans, net of unearned income	109	49
Consumer | Total
Loans receivable
Loans, net of unearned income	117,734	112,303
Consumer | Less than 660
Loans receivable
Loans, net of unearned income	27,952	26,297
Consumer | Less than 660 | Residential first mortgages
Loans receivable
2024	123	163
2023	223	339
2022	354	270
2021	312	232
2020	298	138
Prior	1,473	1,377
Loans, net of unearned income	2,783	2,519
Consumer | Less than 660 | Home equity line of credit (pre-reset)
Loans receivable
Loans, net of unearned income	266	300
Consumer | Less than 660 | Home equity line of credit (post-reset)
Loans receivable
Loans, net of unearned income	58	61
Consumer | Less than 660 | Home equity term loans
Loans receivable
2024	0	0
2023	0	0
2022	0	0
2021	0	2
2020	0	0
Prior	45	54
Loans, net of unearned income	45	56
Consumer | Less than 660 | Home equity loans
Loans receivable
Loans, net of unearned income	369	417
Consumer | Less than 660 | Credit cards
Loans receivable
Loans, net of unearned income	22,855	21,899
Consumer | Less than 660 | Credit cards
Loans receivable
Revolving loans converted to term loans	1,462	1,011
Loans, net of unearned income	24,317	22,910
Consumer | Less than 660 | Credit cards | Canada
Loans receivable
Loans, net of unearned income	562	610
Consumer | Less than 660 | Personal, small business and other
Loans receivable
2024	96	88
2023	132	204
2022	131	52
2021	28	6
2020	2	5
Prior	94	96
Loans, net of unearned income	483	451
Consumer | Less than 660 | Personal, small business and other | Canada
Loans receivable
Loans, net of unearned income	755	877
Consumer | 660 to 739
Loans receivable
Loans, net of unearned income	79,930	76,958
Consumer | 660 to 739 | Residential first mortgages
Loans receivable
2024	2,213	2,758
2023	2,451	3,423
2022	3,272	3,107
2021	2,745	2,143
2020	1,990	1,382
Prior	5,034	4,122
Loans, net of unearned income	17,705	16,935
Consumer | 660 to 739 | Home equity line of credit (pre-reset)
Loans receivable
Loans, net of unearned income	764	905
Consumer | 660 to 739 | Home equity line of credit (post-reset)
Loans receivable
Loans, net of unearned income	80	76
Consumer | 660 to 739 | Home equity term loans
Loans receivable
2024	0	0
2023	0	0
2022	0	0
2021	0	1
2020	1	1
Prior	86	109
Loans, net of unearned income	87	111
Consumer | 660 to 739 | Home equity loans
Loans receivable
Loans, net of unearned income	931	1,092
Consumer | 660 to 739 | Credit cards
Loans receivable
Loans, net of unearned income	59,574	57,479
Consumer | 660 to 739 | Credit cards
Loans receivable
Revolving loans converted to term loans	668	490
Loans, net of unearned income	60,242	57,969
Consumer | 660 to 739 | Personal, small business and other
Loans receivable
2024	398	343
2023	282	351
2022	180	83
2021	38	9
2020	2	7
Prior	152	169
Loans, net of unearned income	1,052	962
Consumer | Greater than or equal to 740
Loans receivable
Loans, net of unearned income	174,872	166,745
Consumer | Greater than or equal to 740 | Residential first mortgages
Loans receivable
2024	10,308	14,309
2023	12,936	16,834
2022	16,034	15,094
2021	14,651	12,827
2020	12,245	6,266
Prior	20,573	16,164
Loans, net of unearned income	86,747	81,494
Consumer | Greater than or equal to 740 | Home equity line of credit (pre-reset)
Loans receivable
Loans, net of unearned income	1,597	1,873
Consumer | Greater than or equal to 740 | Home equity line of credit (post-reset)
Loans receivable
Loans, net of unearned income	75	69
Consumer | Greater than or equal to 740 | Home equity term loans
Loans receivable
2024	0	0
2023	0	0
2022	0	1
2021	1	2
2020	2	2
Prior	111	131
Loans, net of unearned income	114	136
Consumer | Greater than or equal to 740 | Home equity loans
Loans receivable
Loans, net of unearned income	1,786	2,078
Consumer | Greater than or equal to 740 | Credit cards
Loans receivable
Loans, net of unearned income	83,935	81,168
Consumer | Greater than or equal to 740 | Credit cards
Loans receivable
Revolving loans converted to term loans	129	108
Loans, net of unearned income	84,064	81,276
Consumer | Greater than or equal to 740 | Personal, small business and other
Loans receivable
2024	1,219	996
2023	577	583
2022	271	128
2021	54	14
2020	4	8
Prior	150	168
Loans, net of unearned income	2,275	1,897
Consumer | Classifiably managed
Loans receivable
Loans, net of unearned income	25,860	29,209
Consumer | Classifiably managed | Residential first mortgages
Loans receivable
Loans, net of unearned income	0	0
Consumer | Classifiably managed | Home equity loans
Loans receivable
Loans, net of unearned income	0	0
Consumer | Classifiably managed | Credit cards
Loans receivable
Loans, net of unearned income	0	0
Consumer | Classifiably managed | Personal, small business and other
Loans receivable
Loans, net of unearned income	25,860	29,209
Consumer | FICO not available
Loans receivable
Loans, net of unearned income	12,017	12,462
Consumer | FICO not available | Residential first mortgages
Loans receivable
Loans, net of unearned income	7,358	7,763
Consumer | FICO not available | Home equity loans
Loans receivable
Loans, net of unearned income	55	5
Consumer | FICO not available | Credit cards
Loans receivable
Loans, net of unearned income	1,874	1,955
Consumer | FICO not available | Personal, small business and other
Loans receivable
Loans, net of unearned income	2,730	2,739
Consumer | Total loans
Loans receivable
Loans, net of unearned income	$ 320,631	$ 311,671