Allowance for Credit Losses (Details Textuals) (USD $) In Millions									3 Months Ended								3 Months Ended	9 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2009	Sep. 30, 2011 Commercial Portfolio Segment [Member]	Dec. 31, 2010 Commercial Portfolio Segment [Member]	Sep. 30, 2011 Consumer Portfolio Segment [Member]	Jun. 30, 2011 Consumer Portfolio Segment [Member]	Dec. 31, 2010 Consumer Portfolio Segment [Member]	Sep. 30, 2010 Consumer Portfolio Segment [Member]	Jun. 30, 2010 Consumer Portfolio Segment [Member]	Dec. 31, 2009 Consumer Portfolio Segment [Member]	Sep. 30, 2011 Small Business Commercial Loan [Member]	Dec. 31, 2010 Small Business Commercial Loan [Member]	Sep. 30, 2010 Purchased Credit Impaired Loans [Member]	Sep. 30, 2011 Purchased Credit Impaired Loans [Member]	Sep. 30, 2010 Purchased Credit Impaired Loans [Member]	Jun. 30, 2011 Purchased Credit Impaired Loans [Member]	Dec. 31, 2010 Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of Reserves to Loans Held For Sale Related to Business Segment Divestiture									$ 463
Allowance for Credit Losses (Textuals) [Abstract]
Allowance for Loan and Lease Losses, Loans Acquired																	281	2,000	1,400
Allowance for loan and lease losses associated with purchased credit-impaired loan portfolio	35,082	37,312	41,885	43,581	45,255	47,988			9,525	10,931	15,463	16,925	17,692	22,243				8,239		8,400	6,429
U.S. small business commercial renegotiated TDR loans															223	445
Loans Receivable, Fair Value Disclosure	$ 11,224		$ 3,321				$ 6,483	$ 3,321