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Loans and Leases (Impaired Loans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
CRE - property development
   
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance $ 130 $ 197
Unpaid principal balance with no related allowance recorded 143 224
Related allowance 0 [1] 0 [1]
Average recorded investment 148 198
Interest revenue with related allowance recognized 19 16
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 64
Related allowance 0 [1] 0 [1]
Average recorded investment 0 13
Interest revenue with related allowance recognized 0 0
Commercial Real Estate
   
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 130 197
Unpaid principal balance with no related allowance recorded 198 322
Related allowance 0 [1] 0 [1]
Additional allowance for loan losses 22  
Average recorded investment 148 211
Interest revenue recognized $ 19 $ 16
[1] As of December 31, 2013 and 2012, all of the allowance for loan losses of $28 million and $22 million, respectively, related to loans that were not impaired.