Loans - Consumer Loans Excluding Credit Card, Junior Lien Delinquencies (Details 6d) (USD $) In Millions, unless otherwise specified																																																																						9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Sep. 30, 2011 Home Equity Junior Lien [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member] Home Equity Loans [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Days Past Due 150 Or More [Member] Home Equity Loans [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Loans [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Loans [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Loans [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Loans [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Home Equity Loans [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Home Equity Loans [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Home Equity Junior Lien [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Home Equity Junior Lien [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 PCI Home Equity [Member]	Dec. 31, 2010 PCI Home Equity [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member] Home Equity Loans [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 150 Or More [Member] Home Equity Loans [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Revolving Period [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Lines of Credit [Member] Within the Required Amortization Period [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Loans [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Loans [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Loans [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Loans [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Loans [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Home Equity Loans [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due, 30 to 89 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due, 30 to 89 [Member]	Sep. 30, 2011 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 90 to 149 [Member]	Dec. 31, 2010 Purchased Credit-Impaired Home Equity Junior Liens [Member] Days Past Due 90 to 149 [Member]	Sep. 30, 2011 Within the Revolving Period [Member]	Sep. 30, 2011 Within the Required Amortization Period [Member]
Consumer Loans Excluding Credit Card, Junior Lien Delinquencies [Line Items]
Approximate percentage of the PCI home equity portfolio consisting of senior lien loans																																				20.00%
Retained loans	$ 692,944	$ 685,498	$ 687,049	$ 57,914	$ 64,009	$ 214	$ 186	$ 160	$ 145	$ 13	$ 10	$ 41	$ 31	$ 49,312	$ 54,434	$ 660	$ 665	$ 285	$ 384	$ 1,541	$ 1,177	$ 46	$ 41	$ 17	$ 19	$ 7,061	$ 8,398	$ 203	$ 250	$ 110	$ 149	$ 909	$ 956	$ 412	$ 552	$ 23,105	$ 24,459	$ 20,611	$ 22,782	$ 555	$ 475	$ 506	$ 428	$ 2	$ 1	$ 47	$ 46	$ 18,885	$ 21,172	$ 525	$ 601	$ 293	$ 404	$ 337	$ 37	$ 14	$ 1	$ 6	$ 0	$ 1,389	$ 1,573	$ 56	$ 79	$ 33	$ 49	$ 595	$ 681	$ 332	$ 453
Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans				2.65%	2.65%									2.24%	2.19%					4.93%	5.95%					5.01%	5.12%									9.11%	8.93%	7.19%	7.06%									7.01%	6.77%					6.53%	5.41%					9.79%	11.06%
Home Equity Line of Credit, Open-ended Revolving Period																																																																						10 years
Home Equity Line of Credit, Amortization Period																																																																							20 years