Loans - Consumer Loans excluding Credit Card, FICO and LTV (Details 6b) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [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 FICO Score, by LTV Ratio [Line Items]
Retained loans	164,553	174,211
Loans guaranteed by the U.S. government	13,611	12,949
Residential real estate, excluding PCI [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	9,817	10,668
Residential real estate, excluding PCI [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	4,664	5,439
Residential real estate, excluding PCI [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	6,002	6,383
Residential real estate, excluding PCI [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	14,880	15,261
Residential real estate, excluding PCI [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	24,338	26,878
Residential real estate, excluding PCI [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	7,493	8,553
Residential real estate, excluding PCI [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	71,427	74,638
Residential real estate, excluding PCI [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	12,321	13,442
Subprime Mortgage [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	10,045	11,287
Loans guaranteed by the U.S. government	0	0
Subprime Mortgage [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	349	338
Subprime Mortgage [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	1,072	1,153
Subprime Mortgage [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	504	506
Subprime Mortgage [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	1,349	1,486
Subprime Mortgage [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	835	925
Subprime Mortgage [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	1,656	1,955
Subprime Mortgage [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,003	2,252
Subprime Mortgage [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,277	2,672
Prime Mortgages, including option ARMs [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	74,230	74,539
Loans guaranteed by the U.S. government	13,611	12,949
Prime Mortgages, including option ARMs [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,901	3,039
Prime Mortgages, including option ARMs [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	1,321	1,595
Prime Mortgages, including option ARMs [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	4,708	4,733
Prime Mortgages, including option ARMs [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	1,735	1,775
Prime Mortgages, including option ARMs [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	9,767	10,720
Prime Mortgages, including option ARMs [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,432	2,786
Prime Mortgages, including option ARMs [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	33,382	32,385
Prime Mortgages, including option ARMs [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	4,373	4,557
Home Equity Senior Lien [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	22,364	24,376
Loans guaranteed by the U.S. government	0	0
Home Equity Senior Lien [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	319	363
Home Equity Senior Lien [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	162	196
Home Equity Senior Lien [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	654	619
Home Equity Senior Lien [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	253	249
Home Equity Senior Lien [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	1,867	1,900
Home Equity Senior Lien [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	635	657
Home Equity Senior Lien [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	15,819	17,474
Home Equity Senior Lien [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,655	2,918
Home Equity Junior Lien [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	57,914	64,009
Loans guaranteed by the U.S. government	0	0
Home Equity Junior Lien [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	6,248	6,928
Home Equity Junior Lien [Member] | Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,109	2,495
Home Equity Junior Lien [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	9,014	9,403
Home Equity Junior Lien [Member] | Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,665	2,873
Home Equity Junior Lien [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	11,869	13,333
Home Equity Junior Lien [Member] | Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	2,770	3,155
Home Equity Junior Lien [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	20,223	22,527
Home Equity Junior Lien [Member] | Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member]
Consumer Loans Excluding Credit Card Portfolio Segment, by Class, by FICO Score, by LTV Ratio [Line Items]
Retained loans	$ 3,016	$ 3,295