Loans - Consumer Loans excluding Credit Card, Geographic Region (Details 6c) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	$ 692,944	$ 685,498	$ 687,049
Residential real estate, excluding PCI [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	164,553	174,211
Residential real estate, excluding PCI [Member] | California [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	36,079	39,012
Residential real estate, excluding PCI [Member] | New York [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	25,535	26,518
Residential real estate, excluding PCI [Member] | Florida [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	9,996	10,820
Residential real estate, excluding PCI [Member] | Illinois [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	9,731	10,116
Residential real estate, excluding PCI [Member] | Texas [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	8,215	8,747
Residential real estate, excluding PCI [Member] | New Jersey [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	6,525	6,909
Residential real estate, excluding PCI [Member] | Arizona [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	5,441	6,024
Residential real estate, excluding PCI [Member] | Washington [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	4,829	5,221
Residential real estate, excluding PCI [Member] | Ohio [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,894	4,315
Residential real estate, excluding PCI [Member] | Michigan [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,711	4,051
Residential real estate, excluding PCI [Member] | All Other States [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	50,597	52,478
Subprime Mortgage [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	10,045	11,287
Subprime Mortgage [Member] | California [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,527	1,730
Subprime Mortgage [Member] | New York [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,258	1,381
Subprime Mortgage [Member] | Florida [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,257	1,422
Subprime Mortgage [Member] | Illinois [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	407	468
Subprime Mortgage [Member] | Texas [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	310	345
Subprime Mortgage [Member] | New Jersey [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	473	534
Subprime Mortgage [Member] | Arizona [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	208	244
Subprime Mortgage [Member] | Washington [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	219	247
Subprime Mortgage [Member] | Ohio [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	242	275
Subprime Mortgage [Member] | Michigan [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	256	294
Subprime Mortgage [Member] | All Other States [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,888	4,347
Prime Mortgages, including option ARMs [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	74,230	74,539
Prime Mortgages, including option ARMs [Member] | California [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	18,141	19,278
Prime Mortgages, including option ARMs [Member] | New York [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	9,966	9,587
Prime Mortgages, including option ARMs [Member] | Florida [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	4,617	4,840
Prime Mortgages, including option ARMs [Member] | Illinois [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,894	3,765
Prime Mortgages, including option ARMs [Member] | Texas [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	2,795	2,569
Prime Mortgages, including option ARMs [Member] | New Jersey [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	2,027	2,026
Prime Mortgages, including option ARMs [Member] | Arizona [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,218	1,320
Prime Mortgages, including option ARMs [Member] | Washington [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,918	2,056
Prime Mortgages, including option ARMs [Member] | Ohio [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	453	462
Prime Mortgages, including option ARMs [Member] | Michigan [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	926	963
Prime Mortgages, including option ARMs [Member] | All Other States [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	28,275	27,673
Home Equity Senior Lien [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	22,364	24,376
Home Equity Senior Lien [Member] | California [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,135	3,348
Home Equity Senior Lien [Member] | New York [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,060	3,272
Home Equity Senior Lien [Member] | Florida [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,011	1,088
Home Equity Senior Lien [Member] | Illinois [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,530	1,635
Home Equity Senior Lien [Member] | Texas [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,160	3,594
Home Equity Senior Lien [Member] | New Jersey [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	701	732
Home Equity Senior Lien [Member] | Arizona [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,367	1,481
Home Equity Senior Lien [Member] | Washington [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	728	776
Home Equity Senior Lien [Member] | Ohio [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,814	2,010
Home Equity Senior Lien [Member] | Michigan [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,075	1,176
Home Equity Senior Lien [Member] | All Other States [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	4,783	5,264
Home Equity Junior Lien [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	57,914	64,009
Home Equity Junior Lien [Member] | California [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	13,276	14,656
Home Equity Junior Lien [Member] | New York [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	11,251	12,278
Home Equity Junior Lien [Member] | Florida [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,111	3,470
Home Equity Junior Lien [Member] | Illinois [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,900	4,248
Home Equity Junior Lien [Member] | Texas [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,950	2,239
Home Equity Junior Lien [Member] | New Jersey [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	3,324	3,617
Home Equity Junior Lien [Member] | Arizona [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	2,648	2,979
Home Equity Junior Lien [Member] | Washington [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,964	2,142
Home Equity Junior Lien [Member] | Ohio [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,385	1,568
Home Equity Junior Lien [Member] | Michigan [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	1,454	1,618
Home Equity Junior Lien [Member] | All Other States [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by Geographic Region [Line Items]
Retained loans	$ 13,651	$ 15,194