Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - First Lien Mortgage VIEs (Details)

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Securitizations and Other Variable Interest Entities - First Lien Mortgage VIEs (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
On-balance sheet assets          
Trading account assets $ 175,365,000,000   $ 175,365,000,000   $ 176,527,000,000
Debt securities carried at fair value 309,670,000,000   309,670,000,000   322,380,000,000
Held-to-maturity securities 102,279,000,000   102,279,000,000   84,625,000,000
Loans and leases 903,153,000,000   903,153,000,000   896,983,000,000
All other assets 108,700,000,000   108,700,000,000   114,600,000,000
Total assets 2,186,609,000,000 $ 2,149,034,000,000 2,186,609,000,000 $ 2,149,034,000,000 2,144,316,000,000
On-balance sheet liabilities          
Long-term debt 229,617,000,000   229,617,000,000   236,764,000,000
Total liabilities 1,919,540,000,000   1,919,540,000,000   1,888,111,000,000
Unpaid principal balance of mortgage loans eligible for repurchase 214,000,000   214,000,000   222,000,000
Principal amount that would be payable to the securitization vehicles 214,000,000   214,000,000   222,000,000
Loans and leases, measured at fair value 8,660,000,000   8,660,000,000   6,938,000,000
Recurring          
On-balance sheet assets          
Trading account assets 175,365,000,000   175,365,000,000   176,527,000,000
On-balance sheet liabilities          
Loans and leases, measured at fair value 8,660,000,000   8,660,000,000   6,938,000,000
Unconsolidated VIEs | First Lien Mortgage Securitization Trusts | Available-for-sale Securities          
On-balance sheet liabilities          
Other than temporary impairment losses recorded on debt securities 0 $ 0 0 $ 0  
Unconsolidated VIEs | Agency          
Variable Interest Entity [Line Items]          
Maximum loss exposure 25,595,000,000   25,595,000,000   28,188,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 14,000,000   14,000,000   15,000,000
Total assets 25,595,000,000   25,595,000,000   28,188,000,000
Principal amount outstanding 296,116,000,000   296,116,000,000   313,613,000,000
Unconsolidated VIEs | Agency | Senior Lien          
On-balance sheet assets          
Trading account assets 1,137,000,000   1,137,000,000   1,297,000,000
Debt securities carried at fair value 20,476,000,000   20,476,000,000   24,369,000,000
Held-to-maturity securities 3,968,000,000   3,968,000,000   2,507,000,000
Unconsolidated VIEs | Agency | Junior Lien          
On-balance sheet assets          
Trading account assets 0   0   0
Debt securities carried at fair value 0   0   0
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Non-agency | Prime          
Variable Interest Entity [Line Items]          
Maximum loss exposure 854,000,000   854,000,000   1,027,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 33,000,000   33,000,000   40,000,000
Total assets 581,000,000   581,000,000   708,000,000
Principal amount outstanding 14,548,000,000   14,548,000,000   16,087,000,000
Unconsolidated VIEs | Non-agency | Prime | Senior Lien          
On-balance sheet assets          
Trading account assets 21,000,000   21,000,000   42,000,000
Debt securities carried at fair value 517,000,000   517,000,000   613,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Non-agency | Prime | Junior Lien          
On-balance sheet assets          
Trading account assets 1,000,000   1,000,000   1,000,000
Debt securities carried at fair value 9,000,000   9,000,000   12,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Non-agency | Subprime          
Variable Interest Entity [Line Items]          
Maximum loss exposure 2,681,000,000   2,681,000,000   2,905,000,000
On-balance sheet assets          
Residual interests held 6,000,000   6,000,000   0
All other assets 0   0   0
Total assets 2,403,000,000   2,403,000,000   2,613,000,000
Principal amount outstanding 25,329,000,000   25,329,000,000   27,854,000,000
Unconsolidated VIEs | Non-agency | Subprime | Senior Lien          
On-balance sheet assets          
Trading account assets 67,000,000   67,000,000   94,000,000
Debt securities carried at fair value 2,288,000,000   2,288,000,000   2,479,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Non-agency | Subprime | Junior Lien          
On-balance sheet assets          
Trading account assets 40,000,000   40,000,000   37,000,000
Debt securities carried at fair value 2,000,000   2,000,000   3,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Non-agency | Alt-A Loan          
Variable Interest Entity [Line Items]          
Maximum loss exposure 564,000,000   564,000,000   622,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 117,000,000   117,000,000   153,000,000
Total assets 564,000,000   564,000,000   622,000,000
Principal amount outstanding 37,861,000,000   37,861,000,000   40,848,000,000
Unconsolidated VIEs | Non-agency | Alt-A Loan | Senior Lien          
On-balance sheet assets          
Trading account assets 107,000,000   107,000,000   99,000,000
Debt securities carried at fair value 313,000,000   313,000,000   340,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Non-agency | Alt-A Loan | Junior Lien          
On-balance sheet assets          
Trading account assets 1,000,000   1,000,000   2,000,000
Debt securities carried at fair value 26,000,000   26,000,000   28,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Commercial Mortgage          
Variable Interest Entity [Line Items]          
Maximum loss exposure 327,000,000   327,000,000   326,000,000
On-balance sheet assets          
Residual interests held 27,000,000   27,000,000   48,000,000
All other assets 0   0   0
Total assets 193,000,000   193,000,000   233,000,000
Principal amount outstanding 26,205,000,000   26,205,000,000   34,243,000,000
Unconsolidated VIEs | Commercial Mortgage | Senior Lien          
On-balance sheet assets          
Trading account assets 29,000,000   29,000,000   59,000,000
Debt securities carried at fair value 0   0   0
Held-to-maturity securities 38,000,000   38,000,000   37,000,000
Unconsolidated VIEs | Commercial Mortgage | Junior Lien          
On-balance sheet assets          
Trading account assets 32,000,000   32,000,000   22,000,000
Debt securities carried at fair value 54,000,000   54,000,000   54,000,000
Held-to-maturity securities 13,000,000   13,000,000   13,000,000
Consolidated VIEs | Recurring          
On-balance sheet liabilities          
Loans and leases, measured at fair value 691,000,000   691,000,000    
Consolidated VIEs | Agency          
Variable Interest Entity [Line Items]          
Maximum loss exposure 21,246,000,000   21,246,000,000   26,878,000,000
On-balance sheet assets          
Trading account assets 402,000,000   402,000,000   1,101,000,000
Loans and leases 20,386,000,000   20,386,000,000   25,328,000,000
All other assets 459,000,000   459,000,000   449,000,000
Total assets 21,247,000,000   21,247,000,000   26,878,000,000
On-balance sheet liabilities          
Long-term debt 1,000,000   1,000,000   0
All other liabilities 3,000,000   3,000,000   1,000,000
Total liabilities 4,000,000   4,000,000   1,000,000
Consolidated VIEs | Non-agency | Prime          
Variable Interest Entity [Line Items]          
Maximum loss exposure 52,000,000   52,000,000   65,000,000
On-balance sheet assets          
Trading account assets 0   0   0
Loans and leases 83,000,000   83,000,000   111,000,000
All other assets 3,000,000   3,000,000   0
Total assets 86,000,000   86,000,000   111,000,000
On-balance sheet liabilities          
Long-term debt 34,000,000   34,000,000   46,000,000
All other liabilities 0   0   0
Total liabilities 34,000,000   34,000,000   46,000,000
Consolidated VIEs | Non-agency | Subprime          
Variable Interest Entity [Line Items]          
Maximum loss exposure 181,000,000   181,000,000   232,000,000
On-balance sheet assets          
Trading account assets 0   0   188,000,000
Loans and leases 608,000,000   608,000,000   675,000,000
All other assets 45,000,000   45,000,000   54,000,000
Total assets 653,000,000   653,000,000   917,000,000
On-balance sheet liabilities          
Long-term debt 623,000,000   623,000,000   840,000,000
All other liabilities 0   0   0
Total liabilities 623,000,000   623,000,000   840,000,000
Consolidated VIEs | Non-agency | Alt-A Loan          
Variable Interest Entity [Line Items]          
Maximum loss exposure 0   0   0
On-balance sheet assets          
Trading account assets 0   0   0
Loans and leases 0   0   0
All other assets 0   0   0
Total assets 0   0   0
On-balance sheet liabilities          
Long-term debt 0   0   0
All other liabilities 0   0   0
Total liabilities 0   0   0
Consolidated VIEs | Commercial Mortgage          
Variable Interest Entity [Line Items]          
Maximum loss exposure 0   0   0
On-balance sheet assets          
Trading account assets 0   0   0
Loans and leases 0   0   0
All other assets 0   0   0
Total assets 0   0   0
On-balance sheet liabilities          
Long-term debt 0   0   0
All other liabilities 0   0   0
Total liabilities $ 0   $ 0   $ 0