Loans and Leases (Impaired Loans) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011		Jun. 30, 2011		Dec. 31, 2010
Recorded Investment	$ 348		$ 348		$ 463
Unpaid Principal Balance	523		523		619
Related Allowance	32	[1]	32	[1]	69	[1]
Average Recorded Investment	380		398
Interest Revenue Recognized	5		10
Additional allowance for loan losses			22		31
With No Related Allowance Recorded [Member] | CRE - Property Development [Member]
Recorded Investment	201		201		209
Unpaid Principal Balance	231		231		240
Average Recorded Investment	201		203
Interest Revenue Recognized	4		8
With No Related Allowance Recorded [Member] | CRE - Property Development - Acquired Credit-Impaired [Member]
Unpaid Principal Balance	34		34		34
With No Related Allowance Recorded [Member] | CRE - Other - Acquired Credit-Impaired [Member]
Recorded Investment	16		16		16
Unpaid Principal Balance	48		48		47
Average Recorded Investment	16		16
With No Related Allowance Recorded [Member] | CRE - Other [Member]
Recorded Investment	2		2		27
Unpaid Principal Balance	3		3		29
Average Recorded Investment	2		8
Interest Revenue Recognized			1
With an Allowance Recorded [Member] | CRE - Property Development [Member]
Recorded Investment	74		74		79
Unpaid Principal Balance	114		114		113
Related Allowance	24	[1]	24	[1]	24	[1]
Average Recorded Investment	79		79
With an Allowance Recorded [Member] | CRE - Property Development - Acquired Credit-Impaired [Member]
Recorded Investment					42
Unpaid Principal Balance					47
Related Allowance					19	[1]
Average Recorded Investment			10
With an Allowance Recorded [Member] | CRE - Other - Acquired Credit-Impaired [Member]
Recorded Investment	48		48		83
Unpaid Principal Balance	84		84		100
Related Allowance	8	[1]	8	[1]	26	[1]
Average Recorded Investment	75		75
Interest Revenue Recognized	1		1
With an Allowance Recorded [Member] | CRE - Other [Member]
Recorded Investment	7		7		7
Unpaid Principal Balance	9		9		9
Average Recorded Investment	$ 7		$ 7

[1] As of June 30, 2011 and December 31, 2010, we maintained an additional allowance for loan losses of $22 million and $31 million respectively, associated with loans and leases that were not impaired.