Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Other Asset Backed (Details)

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Securitizations and Other Variable Interest Entities - Other Asset Backed (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
On-balance sheet assets          
Trading account assets $ 189,106,000,000   $ 189,106,000,000   $ 191,785,000,000
Debt securities carried at fair value 332,307,000,000   332,307,000,000   320,695,000,000
Held-to-maturity securities 60,072,000,000   60,072,000,000   59,766,000,000
Loans held-for-sale 6,914,000,000   6,914,000,000   12,836,000,000
All other assets 113,175,000,000   113,175,000,000   112,063,000,000
Total assets 2,149,034,000,000 $ 2,170,557,000,000 2,149,034,000,000 $ 2,170,557,000,000 2,104,534,000,000
On-balance sheet liabilities          
Short-term borrowings 252,927,000,000   252,927,000,000   232,449,000,000
Long-term debt 243,414,000,000   243,414,000,000   243,139,000,000
Total liabilities 1,897,375,000,000   1,897,375,000,000   1,861,063,000,000
Resecuritization Trusts          
On-balance sheet liabilities          
Cash proceeds from new securitizations 6,900,000,000 3,900,000,000 13,000,000,000 6,100,000,000  
Automobile and Other Securitization Trusts          
On-balance sheet liabilities          
Principal amount outstanding 440,000,000   440,000,000   1,900,000,000
Automobile Loan          
On-balance sheet liabilities          
Principal amount outstanding 238,000,000   238,000,000   400,000,000
Student Loan          
On-balance sheet liabilities          
Principal amount outstanding 0   0   609,000,000
Other Loan and Receivable          
On-balance sheet liabilities          
Principal amount outstanding 202,000,000   202,000,000   876,000,000
Unconsolidated VIEs | Resecuritization Trusts          
On-balance sheet assets          
Unconsolidated total assets of VIEs 33,339,000,000   33,339,000,000   28,065,000,000
Unconsolidated VIEs | Municipal Bond Trusts          
On-balance sheet assets          
Unconsolidated total assets of VIEs 2,781,000,000   2,781,000,000   3,314,000,000
Unconsolidated VIEs | Automobile and Other Securitization Trusts          
On-balance sheet assets          
Unconsolidated total assets of VIEs 440,000,000   440,000,000   1,276,000,000
Unconsolidated VIEs          
On-balance sheet liabilities          
Other than temporary impairment losses recorded on AFS debt securities 0 $ 0 $ 0 $ 0  
Weighted average remaining life of bonds held in the trusts in years     7 years 1 month    
Unconsolidated VIEs | Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 7,666,000,000   $ 7,666,000,000   8,569,000,000
On-balance sheet assets          
Residual interests held 0   0   7,000,000
All other assets 0   0   0
Total assets 7,666,000,000   7,666,000,000   8,569,000,000
Unconsolidated VIEs | Resecuritization Trusts | Senior Lien          
On-balance sheet assets          
Trading account assets 1,199,000,000   1,199,000,000   767,000,000
Debt securities carried at fair value 5,614,000,000   5,614,000,000   6,945,000,000
Held-to-maturity securities 710,000,000   710,000,000   740,000,000
Unconsolidated VIEs | Resecuritization Trusts | Junior Lien          
On-balance sheet assets          
Trading account assets 73,000,000   73,000,000   37,000,000
Debt securities carried at fair value 70,000,000   70,000,000   73,000,000
Unconsolidated VIEs | Municipal Bond Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 1,755,000,000   1,755,000,000   2,100,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 0   0   0
Total assets 2,000,000   2,000,000   25,000,000
On-balance sheet liabilities          
Liquidity commitments to unconsolidated securitization trusts 1,800,000,000   1,800,000,000   2,100,000,000
Unconsolidated VIEs | Municipal Bond Trusts | Senior Lien          
On-balance sheet assets          
Trading account assets 2,000,000   2,000,000   25,000,000
Debt securities carried at fair value 0   0   0
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Municipal Bond Trusts | Junior Lien          
On-balance sheet assets          
Trading account assets 0   0   0
Debt securities carried at fair value 0   0   0
Unconsolidated VIEs | Automobile and Other Securitization Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 67,000,000   67,000,000   77,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 10,000,000   10,000,000   10,000,000
Total assets 67,000,000   67,000,000   77,000,000
Unconsolidated VIEs | Automobile and Other Securitization Trusts | Senior Lien          
On-balance sheet assets          
Trading account assets 0   0   6,000,000
Debt securities carried at fair value 57,000,000   57,000,000   61,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Automobile and Other Securitization Trusts | Junior Lien          
On-balance sheet assets          
Trading account assets 0   0   0
Debt securities carried at fair value 0   0   0
Consolidated VIEs | Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 439,000,000   439,000,000   654,000,000
On-balance sheet assets          
Trading account assets 666,000,000   666,000,000   1,295,000,000
Loans held-for-sale 0   0   0
All other assets 0   0   0
Total assets 666,000,000   666,000,000   1,295,000,000
On-balance sheet liabilities          
Short-term borrowings 0   0   0
Long-term debt 227,000,000   227,000,000   641,000,000
All other liabilities 0   0   0
Total liabilities 227,000,000   227,000,000   641,000,000
Consolidated VIEs | Municipal Bond Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 1,682,000,000   1,682,000,000   2,440,000,000
On-balance sheet assets          
Trading account assets 1,693,000,000   1,693,000,000   2,452,000,000
Loans held-for-sale 0   0   0
All other assets 1,000,000   1,000,000   0
Total assets 1,694,000,000   1,694,000,000   2,452,000,000
On-balance sheet liabilities          
Short-term borrowings 358,000,000   358,000,000   1,032,000,000
Long-term debt 12,000,000   12,000,000   12,000,000
All other liabilities 0   0   0
Total liabilities 370,000,000   370,000,000   1,044,000,000
Consolidated VIEs | Automobile and Other Securitization Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 0   0   92,000,000
On-balance sheet assets          
Trading account assets 0   0   0
Loans held-for-sale 0   0   555,000,000
All other assets 0   0   54,000,000
Total assets 0   0   609,000,000
On-balance sheet liabilities          
Short-term borrowings 0   0   0
Long-term debt 0   0   516,000,000
All other liabilities 0   0   1,000,000
Total liabilities $ 0   $ 0   $ 517,000,000