Loan Sale and Servicing Activities and Variable Interest Entities (Consolidated VIEs) (Details) (Variable Interest Entity, Primary Beneficiary [Member], USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Market Street [Member]
Aggregate Assets	$ 4,412	[1]	$ 3,584	[1]
Aggregate Liabilities	4,415	[1]	3,588	[1]
Credit Card Securitization Trust [Member]
Aggregate Assets	2,014	[1]	2,269	[1]
Aggregate Liabilities	495	[1]	1,004	[1]
Tax Credit Investments [Member]
Aggregate Assets	2,333	[1],[2]	1,590	[1],[2]
Aggregate Liabilities	$ 736	[1],[2]	$ 420	[1],[2]

[1] Amounts in this table differ from total assets and liabilities in the preceding "Consolidated VIEs - Carrying Value" table as amounts in the preceding table reflect the elimination of intercompany assets and liabilities.

[2] Amounts primarily represent LIHTC investments.