Loans - Residential RealEstate - PCI Loans, Delinquency (Details 8a) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Value	$ 64,061	$ 65,546
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	5,711	5,711
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	71,855	74,492
Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans	21.72%	23.30%
Purchased Credit Impaired [Member] | Current and less than 30 days past due and still accruing [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	56,247	57,137
Purchased Credit Impaired [Member] | 30 - 149 Days Past Due [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,704	4,291
Purchased Credit Impaired [Member] | Days Past Due 150 Or More [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	11,904	13,064
PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Value	22,105	22,693
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	1,494	1,494
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	25,098	26,139
Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans	29.46%	31.45%
PCI Option ARMs [Member] | Current and less than 30 days past due and still accruing [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	17,703	17,919
PCI Option ARMs [Member] | 30 - 149 Days Past Due [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,266	1,467
PCI Option ARMs [Member] | Days Past Due 150 Or More [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	6,129	6,753
PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Financing Receivables, Senior Liens, Percentage	20.00%
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Value	22,305	22,697
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	1,908	1,908
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	24,330	25,064	25,064
Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans	9.03%	9.50%
PCI Home Equity [Member] | Current and less than 30 days past due and still accruing [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	22,132	22,682
PCI Home Equity [Member] | 30 - 149 Days Past Due [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	955	1,130
PCI Home Equity [Member] | Days Past Due 150 Or More [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,243	1,252
PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Value	14,781	15,180
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	1,929	1,929
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	15,462	16,060	16,060
Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans	22.56%	24.36%
PCI Prime Mortgage [Member] | Current and less than 30 days past due and still accruing [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	11,973	12,148
PCI Prime Mortgage [Member] | 30 - 149 Days Past Due [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	810	912
PCI Prime Mortgage [Member] | Days Past Due 150 Or More [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,679	3,000
PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Value	4,870	4,976
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	380	380
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	6,965	7,229	7,229
Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans	36.27%	39.30%
PCI Subprime Mortgage [Member] | Current and less than 30 days past due and still accruing [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,439	4,388
PCI Subprime Mortgage [Member] | 30 - 149 Days Past Due [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	673	782
PCI Subprime Mortgage [Member] | Days Past Due 150 Or More [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,853	2,059
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	12,668	13,114
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,836	3,959
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,178	5,393
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,211	3,328
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	443	434
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	9,617	10,012
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,727	3,884
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,223	2,304
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,248	2,314
Current Estimated Ltv Between 101% And 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,419	1,510
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	9,015	9,223
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,665	3,740
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,392	3,482
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,601	1,629
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	357	372
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	6,695	6,953
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,961	3,035
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,265	1,264
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,340	1,457
Current Estimated LTV Between 80% To 100% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,129	1,197
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,962	6,072
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,165	2,189
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,358	2,409
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,237	1,276
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	202	198
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,633	5,743
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,177	2,215
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	996	998
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,383	1,424
Current Estimated LTV Less Than 80% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,077	1,106
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	10,781	11,210
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,394	2,509
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,683	5,915
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,236	2,313
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Equal to or greater than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	468	473
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	11,484	12,165
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,173	4,608
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,235	3,299
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,206	2,319
Current Estimated LTV Greater Than 125% [Member] | Refreshed FICO Scores Less than 660 [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,870	1,939
California [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	38,192	39,438
California [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	13,100	13,565
California [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	14,677	15,091
California [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	8,803	9,121
California [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,612	1,661
New York [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,338	4,454
New York [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,508	1,548
New York [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,147	1,179
New York [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	998	1,018
New York [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	685	709
Florida [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	7,128	7,585
Florida [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,967	3,201
Florida [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,221	2,307
Florida [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,187	1,265
Florida [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	753	812
Illinois [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,067	2,182
Illinois [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	659	702
Illinois [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	542	558
Illinois [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	482	511
Illinois [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	384	411
Texas [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,128	1,168
Texas [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	132	140
Texas [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	437	455
Texas [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	162	168
Texas [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	397	405
New Jersey [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,108	2,182
New Jersey [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	938	969
New Jersey [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	456	471
New Jersey [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	433	445
New Jersey [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	281	297
Arizona [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,153	1,210
Arizona [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	336	362
Arizona [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	454	468
Arizona [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	243	254
Arizona [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	120	126
Washington [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,479	2,565
Washington [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	624	649
Washington [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,329	1,368
Washington [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	370	388
Washington [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	156	160
Ohio [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	321	336
Ohio [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	104	111
Ohio [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	31	32
Ohio [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	77	79
Ohio [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	109	114
Michigan [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	741	775
Michigan [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	253	268
Michigan [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	78	81
Michigan [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	229	239
Michigan [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	181	187
All Other States [Member] | Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	12,200	12,597
All Other States [Member] | PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,477	4,624
All Other States [Member] | PCI Home Equity [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,958	3,054
All Other States [Member] | PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,478	2,572
All Other States [Member] | PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Delinquency [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 2,287	$ 2,347