Loans And Leases (Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Institutional [Member]
Financing Receivable, Impaired [Line Items]
Additional allowance for loan losses	$ 22		$ 22
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	205	380	222	398
Interest Revenue Recognized	4	5	8	10
Impaired Financing Receivable, Recorded Investment	204		204		238
Unpaid Principal Balance	327		327		367
CRE - Property Development [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	199		199		199
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	227		227		227
CRE - Property Development - Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	34		34		34
CRE - Other - Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5		5		8
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		31
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	66		66		69
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		37
With No Related Allowance Recorded [Member] | CRE - Property Development [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	199	201	199	203
Interest Revenue Recognized	4	4	8	8
With No Related Allowance Recorded [Member] | CRE - Other - Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6	16	23	16
Interest Revenue Recognized	0	0	0	0
With No Related Allowance Recorded [Member] | CRE - Other [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	2	0	8
Interest Revenue Recognized	0	0	0	1
With Allowance Recorded [Member] | CRE - Property Development [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	79	0	79
Interest Revenue Recognized	0	0	0	0
With Allowance Recorded [Member] | CRE - Property Development - Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	0	0	10
Interest Revenue Recognized	0	0	0	0
With Allowance Recorded [Member] | CRE - Other - Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	75	0	75
Interest Revenue Recognized	0	1	0	1
With Allowance Recorded [Member] | CRE - Other [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	7	0	7
Interest Revenue Recognized	$ 0	$ 0	$ 0	$ 0