Quarterly report pursuant to Section 13 or 15(d)

Allowance for Credit Losses - Additional Information (Details)

v3.2.0.727
Allowance for Credit Losses - Additional Information (Details) - Financing Receivable Portfolio Segment [Domain] - Class of Financing Receivable [Domain] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]          
Provision for loan and lease losses $ 729 $ 417 $ 1,485 $ 1,401  
Loans and leases charged off (1,553) (1,844) (3,198) (3,712)  
Allowance for credit losses 13,656 16,314 13,656 16,314  
Receivables Acquired with Deteriorated Credit Quality [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Provision for loan and lease losses 78 (106) 28 (106)  
Loans and leases charged off (290) (160) (578) (551)  
Financing receivable allowance sold 65 $ 28 175 $ 186  
Allowance for credit losses $ 1,102   $ 1,102   $ 1,652