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Loans and Leases - Impaired Loans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
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
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 22 22
Total CRE    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 0 0
Unpaid principal balance with no related allowance recorded 56 56
Commercial and Financial    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 15 0
Unpaid principal balance with related allowance recorded 15 0
Related allowance 1 0
Average Recorded Investment 15  
Interest Revenue Recognized 0  
Total Institutional    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 15 0
Unpaid principal balance with related allowance recorded 15 0
Related allowance 1 0
Average Recorded Investment 15  
Interest Revenue Recognized 0  
Total CRE and institutional    
Financing Receivable, Impaired [Line Items]    
Related allowance 1 0
Total recorded investment 15 0
Total unpaid principal balance 71 $ 56
Total average recorded investment 15  
Total interest income $ 0