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Loans and Leases - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
loan
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
loan
Financing Receivable, Recorded Investment [Line Items]          
Aggregate short-duration advances $ 4,560   $ 4,560   $ 3,540
Loans and leases, allowance for losses 48   $ 48   $ 38
Loans modified in troubled debt restructurings | loan     0   0
Provision for loan losses 5 $ 2 $ 11 $ 6  
Commercial and Financial          
Financing Receivable, Recorded Investment [Line Items]          
Loans and leases, allowance for losses 11   11    
Commercial and Financial | Senior Secured Bank Loans          
Financing Receivable, Recorded Investment [Line Items]          
Loans and leases, allowance for losses 37   $ 37   $ 26
Institutional          
Financing Receivable, Recorded Investment [Line Items]          
Loans more than 90 days past due | loan     0   0
Provision for loan losses 5 $ 2 $ 11 $ 6  
Institutional | Senior Secured Bank Loans          
Financing Receivable, Recorded Investment [Line Items]          
Commercial and financial $ 2,930   $ 2,930   $ 2,070
Commercial Real Estate          
Financing Receivable, Recorded Investment [Line Items]          
Loans more than 90 days past due | loan     0   0