Loans and Leases (Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
CRE - property development
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance	$ 130			$ 130			$ 130
Unpaid principal balance with no related allowance recorded	143			143			143
Related allowance	0	[1]		0	[1]		0	[1]
Average recorded investment	130		130	130		160
Interest revenue with related allowance recognized	3		2	8		17
CRE - property development - acquired credit impaired
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance	0			0			0
Unpaid principal balance with no related allowance recorded	34			34			34
Related allowance	0	[1]		0	[1]		0	[1]
CRE - other - acquired credit impaired
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance	0			0			0
Unpaid principal balance with no related allowance recorded	22			22			21
Related allowance	0	[1]		0	[1]		0	[1]
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance	130			130			130
Unpaid principal balance with no related allowance recorded	199			199			198
Related allowance	0	[1]		0	[1]		0	[1]
Average recorded investment	130		130	130		160
Interest revenue recognized	$ 3		$ 2	$ 8		$ 17

[1] As of September 30, 2014 and December 31, 2013, all of the allowance for loan losses of $34 million and $28 million, respectively, related to loans that were not impaired. Three Months Ended September 30, Average Recorded Investment Interest Revenue Recognized 2014 2013 2014 2013(In millions) With no related allowance recorded: CRE—property development$130 $130 $3 $2Total CRE$130 $130 $3 $2