Loans - Residential RealEstate - PCI Loans, Geographic (Details 8c) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Purchased Credit Impaired [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 77,082	$ 86,073
Purchased Credit Impaired [Member] | California [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	40,848	46,004
Purchased Credit Impaired [Member] | New York [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,553	4,866
Purchased Credit Impaired [Member] | Florida [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	7,926	8,936
Purchased Credit Impaired [Member] | Illinois [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,241	2,387
Purchased Credit Impaired [Member] | Texas [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,203	1,309
Purchased Credit Impaired [Member] | New Jersey [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,236	2,406
Purchased Credit Impaired [Member] | Arizona [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,276	1,591
Purchased Credit Impaired [Member] | Washington [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,648	2,909
Purchased Credit Impaired [Member] | Ohio [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	347	382
Purchased Credit Impaired [Member] | Michigan [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	807	933
Purchased Credit Impaired [Member] | All Other States [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	12,997	14,350
PCI Home Equity [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	25,800	28,312
PCI Home Equity [Member] | California [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	15,522	17,012
PCI Home Equity [Member] | New York [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,208	1,316
PCI Home Equity [Member] | Florida [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,374	2,595
PCI Home Equity [Member] | Illinois [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	575	627
PCI Home Equity [Member] | Texas [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	472	525
PCI Home Equity [Member] | New Jersey [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	489	540
PCI Home Equity [Member] | Arizona [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	485	539
PCI Home Equity [Member] | Washington [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,406	1,535
PCI Home Equity [Member] | Ohio [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	33	38
PCI Home Equity [Member] | Michigan [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	84	95
PCI Home Equity [Member] | All Other States [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,152	3,490
PCI Option ARMs [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	27,163	30,791
PCI Option ARMs [Member] | California [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	14,111	16,130
PCI Option ARMs [Member] | New York [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,592	1,703
PCI Option ARMs [Member] | Florida [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,375	3,916
PCI Option ARMs [Member] | Illinois [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	719	760
PCI Option ARMs [Member] | Texas [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	144	155
PCI Option ARMs [Member] | New Jersey [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	987	1,064
PCI Option ARMs [Member] | Arizona [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	387	528
PCI Option ARMs [Member] | Washington [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	673	745
PCI Option ARMs [Member] | Ohio [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	115	131
PCI Option ARMs [Member] | Michigan [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	285	345
PCI Option ARMs [Member] | All Other States [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,775	5,314
PCI Prime Mortgage [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	16,682	18,928
PCI Prime Mortgage [Member] | California [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	9,486	10,891
PCI Prime Mortgage [Member] | New York [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,037	1,111
PCI Prime Mortgage [Member] | Florida [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,332	1,519
PCI Prime Mortgage [Member] | Illinois [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	526	562
PCI Prime Mortgage [Member] | Texas [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	173	194
PCI Prime Mortgage [Member] | New Jersey [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	458	486
PCI Prime Mortgage [Member] | Arizona [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	271	359
PCI Prime Mortgage [Member] | Washington [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	402	451
PCI Prime Mortgage [Member] | Ohio [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	83	91
PCI Prime Mortgage [Member] | Michigan [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	246	279
PCI Prime Mortgage [Member] | All Other States [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,668	2,985
PCI Subprime Mortgage [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	7,437	8,042
PCI Subprime Mortgage [Member] | California [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,729	1,971
PCI Subprime Mortgage [Member] | New York [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	716	736
PCI Subprime Mortgage [Member] | Florida [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	845	906
PCI Subprime Mortgage [Member] | Illinois [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	421	438
PCI Subprime Mortgage [Member] | Texas [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	414	435
PCI Subprime Mortgage [Member] | New Jersey [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	302	316
PCI Subprime Mortgage [Member] | Arizona [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	133	165
PCI Subprime Mortgage [Member] | Washington [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	167	178
PCI Subprime Mortgage [Member] | Ohio [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	116	122
PCI Subprime Mortgage [Member] | Michigan [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	192	214
PCI Subprime Mortgage [Member] | All Other States [Member]
Residential Real Estate PCI Loans by Class by Geographic Region [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 2,402	$ 2,561