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Loans and Leases (Impaired Loans) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
CRE - property development
     
Financing Receivable, Impaired [Line Items]      
Recorded investment with no related allowance $ 130   $ 130
Unpaid principal balance with no related allowance recorded 143   143
Related allowance 0 [1]   0 [1]
Average recorded investment 130 195  
Interest revenue with related allowance recognized 2 4  
CRE - property development - acquired credit impaired
     
Financing Receivable, Impaired [Line Items]      
Recorded investment with no related allowance 0   0
Unpaid principal balance with no related allowance recorded 34   34
Related allowance 0 [1]   0 [1]
CRE - other - acquired credit impaired
     
Financing Receivable, Impaired [Line Items]      
Recorded investment with no related allowance 0   0
Unpaid principal balance with no related allowance recorded 21   21
Related allowance 0 [1]   0 [1]
Commercial Real Estate
     
Financing Receivable, Impaired [Line Items]      
Recorded investment with no related allowance 130   130
Unpaid principal balance with no related allowance recorded 198   198
Related allowance 0 [1]   0 [1]
Average recorded investment 130 195  
Interest revenue recognized $ 2 $ 4  
[1] As of March 31, 2014 and December 31, 2013, all of the allowance for loan losses of $30 million and $28 million, respectively, related to loans that were not impaired.