Loans - Consumer, Excluding Credit Card Loan Portfolio, PCI Loans (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 804,293	$ 747,508	$ 735,304
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	331,732	294,979	$ 288,379
Consumer, excluding credit card | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	201,097	162,719
Consumer, excluding credit card | Residential real estate | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	52,342	39,227
Consumer, excluding credit card | Residential real estate | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	29,644	27,717
Consumer, excluding credit card | Residential real estate | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	14,279	10,772
Consumer, excluding credit card | Residential real estate | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	10,892	8,044
Consumer, excluding credit card | Residential real estate | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	9,336	8,522
Consumer, excluding credit card | Residential real estate | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	7,769	6,475
Consumer, excluding credit card | Residential real estate | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	5,257	4,241
Consumer, excluding credit card | Residential real estate | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	5,116	4,439
Consumer, excluding credit card | Residential real estate | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,219	2,908
Consumer, excluding credit card | Residential real estate | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,869	2,655
Consumer, excluding credit card | Residential real estate | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	60,374	47,719
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	332	618
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	158	302
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,681	4,049
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,063	1,630
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	9,139	11,409
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,914	3,802
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	161,657	116,469
Consumer, excluding credit card | Residential real estate | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	12,105	12,330
Consumer, excluding credit card | Residential real estate | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	4,604	5,388
Consumer, excluding credit card | Residential real estate | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,810	7,779
Consumer, excluding credit card | Mortgages | Prime
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	150,114	104,921
Consumer, excluding credit card | Mortgages | Prime | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	42,588	28,133
Consumer, excluding credit card | Mortgages | Prime | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	19,695	16,550
Consumer, excluding credit card | Mortgages | Prime | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	10,588	6,654
Consumer, excluding credit card | Mortgages | Prime | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	8,143	4,935
Consumer, excluding credit card | Mortgages | Prime | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,388	5,106
Consumer, excluding credit card | Mortgages | Prime | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	4,930	3,361
Consumer, excluding credit card | Mortgages | Prime | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,662	2,410
Consumer, excluding credit card | Mortgages | Prime | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	2,800	1,805
Consumer, excluding credit card | Mortgages | Prime | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,718	1,203
Consumer, excluding credit card | Mortgages | Prime | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,061	615
Consumer, excluding credit card | Mortgages | Prime | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	48,541	34,149
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	62	120
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	62	103
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	434	648
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	267	340
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,497	3,863
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	852	1,026
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	128,678	81,805
Consumer, excluding credit card | Mortgages | Prime | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	5,214	4,906
Consumer, excluding credit card | Mortgages | Prime | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,513	4,091
Consumer, excluding credit card | Mortgages | Prime | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	6,022	6,879
Consumer, excluding credit card | Mortgages | Subprime mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,853	5,056
Consumer, excluding credit card | Mortgages | Subprime mortgage | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	541	718
Consumer, excluding credit card | Mortgages | Subprime mortgage | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	539	677
Consumer, excluding credit card | Mortgages | Subprime mortgage | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	151	207
Consumer, excluding credit card | Mortgages | Subprime mortgage | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	148	177
Consumer, excluding credit card | Mortgages | Subprime mortgage | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	432	632
Consumer, excluding credit card | Mortgages | Subprime mortgage | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	178	227
Consumer, excluding credit card | Mortgages | Subprime mortgage | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	84	109
Consumer, excluding credit card | Mortgages | Subprime mortgage | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	77	112
Consumer, excluding credit card | Mortgages | Subprime mortgage | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	84	121
Consumer, excluding credit card | Mortgages | Subprime mortgage | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	85	112
Consumer, excluding credit card | Mortgages | Subprime mortgage | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,534	1,964
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3	10
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	20	51
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	36	118
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	139	298
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	178	432
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	468	770
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,406	1,586
Consumer, excluding credit card | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	1,603	1,791
Consumer, excluding credit card | Mortgages | Subprime mortgage | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	396	489
Consumer, excluding credit card | Mortgages | Subprime mortgage | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	213	271
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	42,236	46,696
Related allowance for loan losses	2,788	3,325
Total loans	$ 44,004	$ 49,137
% of 30 days past due to total loans	11.29%	13.33%
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 24,234	$ 26,964
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,642	2,944
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,187	1,332
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	657	731
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,756	4,257
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,187	1,345
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,481	1,674
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	728	802
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	469	531
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	190	209
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,473	8,348
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	387	681
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	367	680
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,410	3,491
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,850	2,755
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,467	9,262
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,695	5,965
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	17,238	16,799
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,590	9,504
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	39,037	42,586
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,910	2,339
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,057	4,212
Consumer, excluding credit card | Residential real estate – PCI | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	15,490	17,095
Related allowance for loan losses	1,708	1,758
Total loans	$ 15,867	$ 17,740
% of 30 days past due to total loans	6.47%	8.15%
Consumer, excluding credit card | Residential real estate – PCI | Home equity | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 9,521	$ 10,671
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	809	876
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	371	405
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	235	273
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,533	1,696
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	319	348
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	850	959
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	289	323
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	46	53
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	18	20
Consumer, excluding credit card | Residential real estate – PCI | Home equity | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,876	2,116
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	298	513
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	159	273
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,676	2,245
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	774	1,073
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,668	4,171
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,443	1,647
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,878	5,824
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,971	1,994
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	14,840	16,295
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	317	445
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	710	1,000
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	9,196	10,220
Related allowance for loan losses	1,031	1,193
Total loans	$ 9,220	$ 10,249
% of 30 days past due to total loans	11.51%	13.05%
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,349	$ 5,965
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	594	672
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	272	301
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	97	92
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	611	689
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	243	279
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	199	225
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	150	167
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	148	166
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	46	48
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,511	1,645
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	19	45
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	50	97
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	269	456
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	259	402
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,579	2,154
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	973	1,316
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,859	3,663
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,212	2,116
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,159	8,912
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	423	500
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	638	837
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	3,329	3,673
Related allowance for loan losses	0	180
Total loans	$ 4,151	$ 4,652
% of 30 days past due to total loans	20.38%	23.37%
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,036	$ 1,138
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	405	463
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	201	229
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	248	281
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	381	432
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	142	165
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	84	95
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	79	85
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	116	130
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	64	72
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,395	1,562
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	22	34
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	88	160
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	127	215
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	318	509
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	405	519
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	788	1,006
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	827	719
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,576	1,490
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,305	3,565
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	465	536
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	381	551
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	14,221	15,708
Related allowance for loan losses	49	194
Total loans	$ 14,766	$ 16,496
% of 30 days past due to total loans	13.77%	16.26%
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 8,328	$ 9,190
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	834	933
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	343	397
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	77	85
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,231	1,440
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	483	553
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	348	395
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	210	227
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Michigan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	159	182
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	62	69
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,691	3,025
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	48	89
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	70	150
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	338	575
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	499	771
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,815	2,418
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,491	1,996
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	6,674	6,593
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,831	3,904
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	12,733	13,814
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 30–149 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	705	858
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 150 or more days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,328	$ 1,824