Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Purchased Credit-Impaired Loans (Details)

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Outstanding Loans and Leases - Purchased Credit-Impaired Loans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Accretable yield, beginning of period $ 4,968   $ 5,608  
Accretion (208)   (661)  
Disposals/transfers (66)   (330)  
Reclassifications from nonaccretable difference 290   367  
Accretable yield, September 30, 2015 4,984   4,984  
Purchased credit impaired loans sold 220 $ 1,300 1,200 $ 1,900
Purchased Credit - impaired        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing receivable allowance sold $ 38 $ 131 $ 213 $ 317