Loans - Consumer, Excluding Credit Card Loan Portfolio, PCI Loans (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 943,841	$ 969,415	$ 925,611
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	359,715	373,637	$ 373,243
Consumer, excluding credit card | Total PCI
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	220,158	231,078
Unpaid principal balance of impaired loans	6,120	6,207
Consumer, excluding credit card | Total PCI | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	71,894	74,759
Consumer, excluding credit card | Total PCI | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	10,428	10,704
Consumer, excluding credit card | Total PCI | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	27,556	28,847
Consumer, excluding credit card | Total PCI | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	7,974	8,304
Consumer, excluding credit card | Total PCI | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	14,607	15,249
Consumer, excluding credit card | Total PCI | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,804	7,302
Consumer, excluding credit card | Total PCI | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,350	6,574
Consumer, excluding credit card | Total PCI | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	4,167	4,434
Consumer, excluding credit card | Total PCI | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	49,460	52,996
Consumer, excluding credit card | Total PCI | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	826	813
Consumer, excluding credit card | Total PCI | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	24	25
Consumer, excluding credit card | Total PCI | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	11	13
Consumer, excluding credit card | Total PCI | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	23	37
Consumer, excluding credit card | Total PCI | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	39	53
Consumer, excluding credit card | Total PCI | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	4,465	3,977
Consumer, excluding credit card | Total PCI | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	228	281
Consumer, excluding credit card | Total PCI | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	202,482	212,505
Consumer, excluding credit card | Total PCI | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,442	6,457
Consumer, excluding credit card | Total PCI | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	215,815	225,899
Consumer, excluding credit card | Total PCI | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,179	2,763
Consumer, excluding credit card | Total PCI | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,164	2,416
Consumer, excluding credit card | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	27,072	28,340
Unpaid principal balance of impaired loans	3,434	3,466
Consumer, excluding credit card | Home equity | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	5,518	5,695
Consumer, excluding credit card | Home equity | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,496	1,575
Consumer, excluding credit card | Home equity | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	5,488	5,769
Consumer, excluding credit card | Home equity | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	835	869
Consumer, excluding credit card | Home equity | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,026	2,131
Consumer, excluding credit card | Home equity | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,558	1,642
Consumer, excluding credit card | Home equity | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	225	236
Consumer, excluding credit card | Home equity | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,097	1,158
Consumer, excluding credit card | Home equity | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,585	6,925
Consumer, excluding credit card | Home equity | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	818	885
Consumer, excluding credit card | Home equity | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	5	6
Consumer, excluding credit card | Home equity | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1	1
Consumer, excluding credit card | Home equity | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	86	111
Consumer, excluding credit card | Home equity | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	29	38
Consumer, excluding credit card | Home equity | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	867	986
Consumer, excluding credit card | Home equity | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	270	326
Consumer, excluding credit card | Home equity | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	21,811	22,632
Consumer, excluding credit card | Home equity | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,185	3,355
Consumer, excluding credit card | Home equity | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	26,422	27,611
Consumer, excluding credit card | Home equity | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	399	453
Consumer, excluding credit card | Home equity | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	251	276
Consumer, excluding credit card | Residential real estate – PCI | Total PCI
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	23,207	24,034
Unpaid principal balance of impaired loans	$ 23,914	$ 24,741
% of 30 days past due to total loans	8.90%	9.16%
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	$ 12,935	$ 13,389
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	2,178	2,255
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,621	1,660
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	708	738
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	690	709
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	658	690
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	480	491
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	406	417
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	379	393
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	376	389
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	3,483	3,610
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	860	951
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	22	21
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	31	36
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	153	162
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	124	155
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,026	1,053
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	688	851
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	14,410	14,087
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	6,600	7,425
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	21,786	22,475
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,151	1,221
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	977	1,045
Consumer, excluding credit card | Residential real estate – PCI | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	8,584	8,963
Unpaid principal balance of impaired loans	$ 8,770	$ 9,144
% of 30 days past due to total loans	5.37%	5.69%
Consumer, excluding credit card | Residential real estate – PCI | Home equity | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	$ 5,196	$ 5,420
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	941	976
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	507	525
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	401	419
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	224	233
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	202	210
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	63	65
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	47	48
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	51	54
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	159	165
Consumer, excluding credit card | Residential real estate – PCI | Home equity | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	979	1,029
Consumer, excluding credit card | Residential real estate – PCI | Home equity | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	244	265
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	17	17
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	10	13
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	119	135
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	53	65
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	766	805
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	324	388
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	5,480	5,548
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,757	1,908
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	8,299	8,624
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	246	278
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	225	242
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	4,529	4,690
Unpaid principal balance of impaired loans	$ 4,550	$ 4,708
% of 30 days past due to total loans	10.07%	10.24%
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	$ 2,490	$ 2,578
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	317	332
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	359	365
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	94	98
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	150	154
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	128	134
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	111	113
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	94	95
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	88	91
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	66	69
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	653	679
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	198	228
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	2	1
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	6	7
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	8	6
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	19	22
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	78	75
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	86	112
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	2,788	2,689
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,365	1,568
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	4,092	4,226
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	256	259
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	202	223
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,909	1,945
Unpaid principal balance of impaired loans	$ 2,395	$ 2,442
% of 30 days past due to total loans	16.33%	16.75%
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	$ 583	$ 593
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	229	234
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	264	268
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	42	44
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	121	123
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	85	88
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	73	73
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	94	96
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	36	37
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	42	43
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	826	843
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	103	113
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	0	0
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	9	9
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	5	4
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	30	35
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	59	54
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	133	161
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	826	739
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,230	1,327
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	2,004	2,033
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	268	286
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	123	123
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	8,185	8,436
Unpaid principal balance of impaired loans	$ 8,199	$ 8,447
% of 30 days past due to total loans	9.85%	10.12%
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	$ 4,666	$ 4,798
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	691	713
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	491	502
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	171	177
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	195	199
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	243	258
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	233	240
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	171	178
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	204	211
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	109	112
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	1,025	1,059
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | No FICO/LTV available
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	315	345
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Greater than 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	3	3
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Greater than 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	6	7
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 101% to 125% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	21	17
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 101% to 125% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	22	33
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 80% to 100% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	123	119
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 80% to 100% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	145	190
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Less than 80% and refreshed FICO scores | Equal to or greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	5,316	5,111
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Less than 80% and refreshed FICO scores | Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	2,248	2,622
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	7,391	7,592
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	381	398
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of impaired loans	$ 427	$ 457