Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Home Equity Loans (Details)

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Securitizations and Other Variable Interest Entities - Home Equity Loans (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
On-balance sheet assets            
Trading account assets $ 180,018   $ 191,785      
Debt securities carried at fair value 325,078   320,695      
Loans and leases 887,689   881,391      
Allowance for loan and lease losses (12,657) $ (13,068) (14,419) $ (15,106) $ (15,811) $ (17,428)
All other assets 108,871   112,063      
Total assets 2,153,006   2,104,534 $ 2,123,613    
On-balance sheet liabilities            
Long-term debt 237,288   243,139      
Total liabilities 1,897,101   1,861,063      
Home equity            
Variable Interest Entity [Line Items]            
Maximum loss exposure 4,673   6,215      
On-balance sheet assets            
Trading account assets 43   14      
Debt securities carried at fair value 59   39      
Loans and leases 347   1,014      
Allowance for loan and lease losses (16)   (56)      
All other assets 8   33      
Total assets 441   1,044      
On-balance sheet liabilities            
Long-term debt 202   1,076      
Total liabilities 202   1,076      
Principal amount outstanding 6,515   7,376      
Trust certificates outstanding 4,400   6,300      
Remaining borrowing capacity on home equity line 11   39      
Assets of deconsolidated securitization vehicles 488          
Liabilities of deconsolidated securitization vehicles 611          
Gain on sale of securitization vehicles 123          
Home equity | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 239   991      
On-balance sheet assets            
Trading account assets 0   0      
Debt securities carried at fair value 0   0      
Loans and leases 347   1,014      
Allowance for loan and lease losses (16)   (56)      
All other assets 8   33      
Total assets 339   991      
On-balance sheet liabilities            
Long-term debt 202   1,076      
Total liabilities 202   1,076      
Principal amount outstanding 347   1,014      
Home equity | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 4,434   5,224      
On-balance sheet assets            
Trading account assets 43   14      
Debt securities carried at fair value 59   39      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 0   0      
Total assets 102   53      
On-balance sheet liabilities            
Long-term debt 0   0      
Total liabilities 0   0      
Principal amount outstanding $ 6,168   $ 6,362