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Loans and Leases - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
loan_segment
loan
Jun. 30, 2015
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Financing Receivable, Recorded Investment [Line Items]          
Number of Loan Segments | loan_segment     2    
Aggregate short-duration advances $ 4,320   $ 4,320   $ 2,620
Loans and leases, allowance for losses 51   $ 51   46
Loans modified in troubled debt restructurings | loan     0 0  
Charge-offs 0 $ 0 $ (3) $ 0  
Provision for loan losses 4 $ 2 8 $ 6  
Commercial and Financial          
Financing Receivable, Recorded Investment [Line Items]          
Loans and leases, allowance for losses 8   8    
Commercial and Financial | Senior Secured Bank Loans          
Financing Receivable, Recorded Investment [Line Items]          
Loans and leases, allowance for losses 43   $ 43   $ 35
Total Institutional          
Financing Receivable, Recorded Investment [Line Items]          
Loans more than 90 days past due | loan     0   0
Total Institutional | Senior Secured Bank Loans          
Financing Receivable, Recorded Investment [Line Items]          
Commercial and financial $ 3,300   $ 3,300   $ 3,140
Total CRE          
Financing Receivable, Recorded Investment [Line Items]          
Loans more than 90 days past due | loan     0   0