Loans And Leases (Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 238	$ 463
Unpaid Principal Balance	367	619
Related Allowance		69	[1]
Average Recorded Investment	243
Interest Revenue Recognized	16
Additional allowance for loan losses	22	31
With No Related Allowance Recorded [Member] | CRE-Property Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	199	209
Unpaid Principal Balance	227	240
Average Recorded Investment	200
Interest Revenue Recognized	15
With No Related Allowance Recorded [Member] | CRE-Property Development - Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	34	34
With No Related Allowance Recorded [Member] | CRE-Other-Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	8	16
Unpaid Principal Balance	69	47
Average Recorded Investment	12
With No Related Allowance Recorded [Member] | CRE-Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		27
Unpaid Principal Balance		29
With An Allowance Recorded [Member] | CRE-Property Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		79
Unpaid Principal Balance		113
Related Allowance		24	[1]
With An Allowance Recorded [Member] | CRE-Property Development - Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		42
Unpaid Principal Balance		47
Related Allowance		19	[1]
With An Allowance Recorded [Member] | CRE-Other-Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	31	83
Unpaid Principal Balance	37	100
Related Allowance		26	[1]
Average Recorded Investment	31
Interest Revenue Recognized	1
With An Allowance Recorded [Member] | CRE-Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		7
Unpaid Principal Balance		$ 9

[1] As of December 31, 2011 and December 31, 2010, we maintained allowances for loan losses of $22 million and $31 million, respectively, associated with loans and leases that were not impaired.