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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
On-balance sheet assets          
Trading account assets $ 180,018,000,000   $ 180,018,000,000   $ 191,785,000,000
Debt securities carried at fair value 325,078,000,000   325,078,000,000   320,695,000,000
Held-to-maturity securities 66,573,000,000   66,573,000,000   59,766,000,000
Loans held-for-sale 8,842,000,000   8,842,000,000   12,836,000,000
All other assets 108,871,000,000   108,871,000,000   112,063,000,000
Total assets 2,153,006,000,000 $ 2,123,613,000,000 2,153,006,000,000 $ 2,123,613,000,000 2,104,534,000,000
On-balance sheet liabilities          
Short-term borrowings 233,756,000,000   233,756,000,000   232,449,000,000
Long-term debt 237,288,000,000   237,288,000,000   243,139,000,000
Total liabilities 1,897,101,000,000   1,897,101,000,000   1,861,063,000,000
Resecuritization Trusts          
On-balance sheet liabilities          
Cash proceeds from new securitizations 9,100,000,000 4,700,000,000 22,100,000,000 10,800,000,000  
Resecuritization Trusts | Available-for-sale Securities          
On-balance sheet liabilities          
Cash proceeds from new securitizations 0 549,000,000 0 1,500,000,000  
Gain on sale of resecuritizations   9,000,000   71,000,000  
Resecuritization Trusts | Other Security Investments          
On-balance sheet liabilities          
Gain on sale of resecuritizations 0 0 0 0  
Resecuritization Trusts | Debt securities          
On-balance sheet liabilities          
Cash proceeds from new securitizations 3,500,000,000 1,600,000,000 5,200,000,000 4,200,000,000  
Resecuritization Trusts | Held-to-maturity Securities          
On-balance sheet liabilities          
Cash proceeds from new securitizations 1,000,000,000   1,400,000,000    
Automobile and Other Securitization Trusts          
On-balance sheet liabilities          
Principal amount outstanding 370,000,000   370,000,000   1,900,000,000
Automobile Loan          
On-balance sheet liabilities          
Principal amount outstanding 175,000,000   175,000,000   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 195,000,000   195,000,000   876,000,000
Unconsolidated VIEs | Resecuritization Trusts          
On-balance sheet assets          
Unconsolidated total assets of VIEs 35,042,000,000   35,042,000,000   28,065,000,000
Unconsolidated VIEs | Municipal Bond Trusts          
On-balance sheet assets          
Unconsolidated total assets of VIEs 2,881,000,000   2,881,000,000   3,314,000,000
Unconsolidated VIEs | Automobile and Other Securitization Trusts          
On-balance sheet assets          
Unconsolidated total assets of VIEs 370,000,000   370,000,000   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 9,646,000,000   $ 9,646,000,000   8,569,000,000
On-balance sheet assets          
Residual interests held 0   0   7,000,000
All other assets 0   0   0
Total assets 9,646,000,000   9,646,000,000   8,569,000,000
Unconsolidated VIEs | Resecuritization Trusts | Senior Lien          
On-balance sheet assets          
Trading account assets 888,000,000   888,000,000   767,000,000
Debt securities carried at fair value 5,046,000,000   5,046,000,000   6,945,000,000
Held-to-maturity securities 3,559,000,000   3,559,000,000   740,000,000
Unconsolidated VIEs | Resecuritization Trusts | Junior Lien          
On-balance sheet assets          
Trading account assets 83,000,000   83,000,000   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 1,675,000,000   1,675,000,000   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 1,700,000,000   1,700,000,000   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 65,000,000   65,000,000   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 65,000,000   65,000,000   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 55,000,000   55,000,000   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 450,000,000   450,000,000   654,000,000
On-balance sheet assets          
Trading account assets 864,000,000   864,000,000   1,295,000,000
Loans held-for-sale 0   0   0
All other assets 0   0   0
Total assets 864,000,000   864,000,000   1,295,000,000
On-balance sheet liabilities          
Short-term borrowings 0   0   0
Long-term debt 414,000,000   414,000,000   641,000,000
All other liabilities 0   0   0
Total liabilities 414,000,000   414,000,000   641,000,000
Consolidated VIEs | Municipal Bond Trusts          
Variable Interest Entity [Line Items]          
Maximum loss exposure 1,888,000,000   1,888,000,000   2,440,000,000
On-balance sheet assets          
Trading account assets 1,899,000,000   1,899,000,000   2,452,000,000
Loans held-for-sale 0   0   0
All other assets 1,000,000   1,000,000   0
Total assets 1,900,000,000   1,900,000,000   2,452,000,000
On-balance sheet liabilities          
Short-term borrowings 567,000,000   567,000,000   1,032,000,000
Long-term debt 12,000,000   12,000,000   12,000,000
All other liabilities 0   0   0
Total liabilities 579,000,000   579,000,000   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