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 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Accretable yield, beginning of period $ 4,569 $ 5,608 $ 5,608
Accretion (192)   (861)
Disposals/transfers (111)   (465)
Reclassifications (to) from nonaccretable difference (16)   287
Accretable yield, end of period 4,250   $ 4,569
Purchased credit impaired loans sold 174 586  
Purchased Credit - impaired      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing receivable allowance sold $ 20 $ 110