Loans - Consumer, Excluding Credit Card Loans, Residential Real Estate, Excluding PCI Loans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	747,508	$ 724,177	$ 726,835
Consumer, excluding credit card
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	294,979	288,449	292,620
Consumer, excluding credit card | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria	150 days
Consumer, excluding credit card | Days Past Due, 30 or More
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria	30 days
Consumer, excluding credit card | Home equity - senior lien
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	16,367	17,113
% of 30 days past due to total retained loans	3.89%	3.76%
Consumer, excluding credit card | Home equity - senior lien | California
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,232	2,397
Consumer, excluding credit card | Home equity - senior lien | New York
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,805	2,732
Consumer, excluding credit card | Home equity - senior lien | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,306	1,248
Consumer, excluding credit card | Home equity - senior lien | Florida
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	861	847
Consumer, excluding credit card | Home equity - senior lien | Texas
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,845	2,044
Consumer, excluding credit card | Home equity - senior lien | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	654	630
Consumer, excluding credit card | Home equity - senior lien | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	927	1,019
Consumer, excluding credit card | Home equity - senior lien | Washington
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	506	555
Consumer, excluding credit card | Home equity - senior lien | Michigan
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	736	799
Consumer, excluding credit card | Home equity - senior lien | Ohio
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,150	1,298
Consumer, excluding credit card | Home equity - senior lien | All other
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,345	3,544
Consumer, excluding credit card | Home equity - senior lien | Current and less than 30 days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	15,730	16,470
Consumer, excluding credit card | Home equity - senior lien | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	275	298
Consumer, excluding credit card | Home equity - senior lien | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	362	345
Consumer, excluding credit card | Home equity - senior lien | 90 or more days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Home equity - senior lien | Nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	938	932
Consumer, excluding credit card | Home equity - senior lien | U.S. government-guaranteed
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Home equity - senior lien | U.S. government-guaranteed | Days Past Due, 90 or More
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	21	40
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	10	22
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	134	212
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	69	107
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	633	858
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	226	326
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	13,048	13,186
Consumer, excluding credit card | Home equity - senior lien | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,226	2,362
Consumer, excluding credit card | Home equity - junior lien
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	36,375	40,750
% of 30 days past due to total retained loans	2.20%	2.17%
Period past due, credit analysis factors, charge off criteria	180 days
Consumer, excluding credit card | Home equity - junior lien | California
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	8,144	9,240
Consumer, excluding credit card | Home equity - junior lien | New York
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	7,685	8,429
Consumer, excluding credit card | Home equity - junior lien | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,605	2,815
Consumer, excluding credit card | Home equity - junior lien | Florida
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,923	2,167
Consumer, excluding credit card | Home equity - junior lien | Texas
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,087	1,199
Consumer, excluding credit card | Home equity - junior lien | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,233	2,442
Consumer, excluding credit card | Home equity - junior lien | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,595	1,827
Consumer, excluding credit card | Home equity - junior lien | Washington
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,216	1,378
Consumer, excluding credit card | Home equity - junior lien | Michigan
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	848	976
Consumer, excluding credit card | Home equity - junior lien | Ohio
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	778	907
Consumer, excluding credit card | Home equity - junior lien | All other
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	8,261	9,370
Consumer, excluding credit card | Home equity - junior lien | Current and less than 30 days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	35,575	39,864
Consumer, excluding credit card | Home equity - junior lien | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	533	662
Consumer, excluding credit card | Home equity - junior lien | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	267	224
Consumer, excluding credit card | Home equity - junior lien | 90 or more days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Home equity - junior lien | Nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,590	1,876
Consumer, excluding credit card | Home equity - junior lien | U.S. government-guaranteed
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Home equity - junior lien | U.S. government-guaranteed | Days Past Due, 90 or More
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Home equity - junior lien | Minimum | U.S. government-guaranteed | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria	30 days
Consumer, excluding credit card | Home equity - junior lien | Minimum | U.S. government-guaranteed | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria	150 days
Consumer, excluding credit card | Home equity - junior lien | Maximum | U.S. government-guaranteed | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria	149 days
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	467	1,101
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	138	346
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,149	4,645
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	923	1,407
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	6,481	7,995
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,780	2,128
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	20,030	19,732
Consumer, excluding credit card | Home equity - junior lien | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,407	3,396
Consumer, excluding credit card | Mortgages - prime, including option ARMS
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	104,921	87,162
% of 30 days past due to total retained loans	1.42%	2.32%
Consumer, excluding credit card | Mortgages - prime, including option ARMS | California
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	28,133	21,876
Consumer, excluding credit card | Mortgages - prime, including option ARMS | New York
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	16,550	14,085
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	6,654	5,216
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Florida
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	5,106	4,598
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Texas
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,935	3,565
Consumer, excluding credit card | Mortgages - prime, including option ARMS | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,361	2,679
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,805	1,385
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Washington
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,410	1,951
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Michigan
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,203	998
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Ohio
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	615	466
Consumer, excluding credit card | Mortgages - prime, including option ARMS | All other
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	34,149	30,343
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current and less than 30 days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	93,951	76,108
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,091	3,155
Consumer, excluding credit card | Mortgages - prime, including option ARMS | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	6,879	7,899
Consumer, excluding credit card | Mortgages - prime, including option ARMS | 90 or more days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,190	2,666
Consumer, excluding credit card | Mortgages - prime, including option ARMS | U.S. government-guaranteed
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	12,110	13,712
Consumer, excluding credit card | Mortgages - prime, including option ARMS | U.S. government-guaranteed | Days Past Due, 90 or More
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	7,544	7,823
Consumer, excluding credit card | Mortgages - prime, including option ARMS | U.S. government-guaranteed | Days Past Due, 30 or More
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	9,500	9,000
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	120	236
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	103	281
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	648	1,210
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	340	679
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,863	4,749
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,026	1,590
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	81,805	59,634
Consumer, excluding credit card | Mortgages - prime, including option ARMS | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,906	5,071
Consumer, excluding credit card | Mortgages - subprime
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	5,056	7,104
% of 30 days past due to total retained loans	15.03%	16.16%
Consumer, excluding credit card | Mortgages - subprime | California
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	718	1,069
Consumer, excluding credit card | Mortgages - subprime | New York
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	677	942
Consumer, excluding credit card | Mortgages - subprime | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	207	280
Consumer, excluding credit card | Mortgages - subprime | Florida
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	632	885
Consumer, excluding credit card | Mortgages - subprime | Texas
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	177	220
Consumer, excluding credit card | Mortgages - subprime | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	227	339
Consumer, excluding credit card | Mortgages - subprime | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	112	144
Consumer, excluding credit card | Mortgages - subprime | Washington
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	109	150
Consumer, excluding credit card | Mortgages - subprime | Michigan
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	121	178
Consumer, excluding credit card | Mortgages - subprime | Ohio
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	112	161
Consumer, excluding credit card | Mortgages - subprime | All other
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,964	2,736
Consumer, excluding credit card | Mortgages - subprime | Current and less than 30 days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,296	5,956
Consumer, excluding credit card | Mortgages - subprime | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	489	646
Consumer, excluding credit card | Mortgages - subprime | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	271	502
Consumer, excluding credit card | Mortgages - subprime | 90 or more days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Mortgages - subprime | Nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,036	1,390
Consumer, excluding credit card | Mortgages - subprime | U.S. government-guaranteed
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Mortgages - subprime | U.S. government-guaranteed | Days Past Due, 90 or More
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	10	52
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	51	197
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	118	249
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	298	597
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	432	614
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	770	1,141
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,586	1,961
Consumer, excluding credit card | Mortgages - subprime | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,791	2,293
Consumer, excluding credit card | Residential real estate – excluding PCI
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	162,719	152,129
% of 30 days past due to total retained loans	2.27%	3.09%
Consumer, excluding credit card | Residential real estate – excluding PCI | California
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	39,227	34,582
Consumer, excluding credit card | Residential real estate – excluding PCI | New York
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	27,717	26,188
Consumer, excluding credit card | Residential real estate – excluding PCI | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	10,772	9,559
Consumer, excluding credit card | Residential real estate – excluding PCI | Florida
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	8,522	8,497
Consumer, excluding credit card | Residential real estate – excluding PCI | Texas
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	8,044	7,028
Consumer, excluding credit card | Residential real estate – excluding PCI | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	6,475	6,090
Consumer, excluding credit card | Residential real estate – excluding PCI | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,439	4,375
Consumer, excluding credit card | Residential real estate – excluding PCI | Washington
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,241	4,034
Consumer, excluding credit card | Residential real estate – excluding PCI | Michigan
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,908	2,951
Consumer, excluding credit card | Residential real estate – excluding PCI | Ohio
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,655	2,832
Consumer, excluding credit card | Residential real estate – excluding PCI | All other
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	47,719	45,993
Consumer, excluding credit card | Residential real estate – excluding PCI | Current and less than 30 days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	149,552	138,398
Consumer, excluding credit card | Residential real estate – excluding PCI | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	5,388	4,761
Consumer, excluding credit card | Residential real estate – excluding PCI | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	7,779	8,970
Consumer, excluding credit card | Residential real estate – excluding PCI | 90 or more days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	0	0
Consumer, excluding credit card | Residential real estate – excluding PCI | Nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	5,754	6,864
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	12,110	13,712
Percentage of Principal Balance Insured and Interest Guaranteed	100.00%
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed | Current and less than 30 days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,600	4,700
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed | Days Past Due, 30 to 149
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,500	2,400
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed | 150 days past due
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	6,000	6,600
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed | 90 or more days past due and still accruing
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria	90 days
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed | Days Past Due, 90 or More
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	7,544	7,823
Consumer, excluding credit card | Residential real estate – excluding PCI | U.S. government-guaranteed | Nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,200	4,700
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	618	1,429
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Greater than 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	302	846
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	4,049	6,316
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Between 101% and 125% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,630	2,790
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	11,409	14,216
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Between 80% and 100% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,802	5,185
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Equal to or Greater than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	116,469	94,513
Consumer, excluding credit card | Residential real estate – excluding PCI | Current Estimated LTV Ratio Less than 80% | Refreshed FICO Scores Less than 660
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	12,330	$ 13,122