Loans and Allowance for Credit Losses (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Loans and Allowance for Credit Losses (Textuals) [Abstract]
Loans pledged at the Federal Home Loan Bank ("FHLB")	$ 60,400,000,000		$ 60,400,000,000		$ 62,800,000,000
Loans pledged at the Federal Reserve Bank	44,600,000,000		44,600,000,000		44,600,000,000
Unearned interest and deferred fees and costs on loans	1,200,000,000		1,200,000,000		1,300,000,000
Expected reimbursements from the FDIC	2,800,000,000		2,800,000,000		3,100,000,000
Purchased impaired loans nonperforming assets	300,000,000		300,000,000		500,000,000
Fair value of impaired loans			238,000,000
Receivables of impaired loans acquired in FCB transactions, including covered and uncovered portion			502,000,000
Cash Receivables of impaired loans to be collected with interest			338,000,000
Fair value of non-impaired loans			828,000,000
Receivables of non-impaired loans acquired in FCB transactions			1,200,000,000
Cash Receivables of non-impaired loans not expected to be collected			184,000,000
Period of accruing loans related nonperforming assets and related ratios			90 days
Partial Charge Off Period Of Loans Secured By Family Properties			180 days
Charge Off Period Of Revolving Consumer Lines And Credit Cards			180 days
Charge Off Period Of Closed End Consumer Loans Other Than Loans Secured By Family Properties			120 days
Non accrual commercial lease financing loans	43,000,000		43,000,000		78,000,000
Net gains on the sale of loan	$ 51,000,000	$ 92,000,000	$ 266,000,000	$ 203,000,000