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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
On-balance sheet assets          
Trading account assets $ 187,849,000,000   $ 187,849,000,000   $ 176,527,000,000
Debt securities carried at fair value 322,505,000,000   322,505,000,000   322,380,000,000
Held-to-maturity securities 112,409,000,000   112,409,000,000   84,508,000,000
Loans and leases 905,008,000,000   905,008,000,000   896,983,000,000
All other assets 111,365,000,000   111,365,000,000   114,688,000,000
Total assets 2,195,314,000,000 $ 2,152,962,000,000 2,195,314,000,000 $ 2,152,962,000,000 2,144,287,000,000
On-balance sheet liabilities          
Long-term debt 225,136,000,000   225,136,000,000   236,764,000,000
Total liabilities 1,925,231,000,000   1,925,231,000,000   1,888,111,000,000
Unpaid principal balance of mortgage loans eligible for repurchase 326,000,000   326,000,000   222,000,000
Principal amount that would be payable to the securitization vehicles 326,000,000   326,000,000   222,000,000
Loans and leases, measured at fair value 8,108,000,000   8,108,000,000   6,938,000,000
Recurring          
On-balance sheet assets          
Trading account assets 187,849,000,000   187,849,000,000   176,527,000,000
On-balance sheet liabilities          
Loans and leases, measured at fair value 8,108,000,000   8,108,000,000   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 24,492,000,000   24,492,000,000   28,192,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 13,000,000   13,000,000   15,000,000
Total assets 24,492,000,000   24,492,000,000   28,192,000,000
Principal amount outstanding 284,246,000,000   284,246,000,000   313,613,000,000
Unconsolidated VIEs | Agency | Senior Lien          
On-balance sheet assets          
Trading account assets 1,345,000,000   1,345,000,000   1,297,000,000
Debt securities carried at fair value 19,322,000,000   19,322,000,000   24,369,000,000
Held-to-maturity securities 3,812,000,000   3,812,000,000   2,511,000,000
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 778,000,000   778,000,000   1,027,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 29,000,000   29,000,000   40,000,000
Total assets 531,000,000   531,000,000   708,000,000
Principal amount outstanding 13,767,000,000   13,767,000,000   16,087,000,000
Unconsolidated VIEs | Non-agency | Prime | Senior Lien          
On-balance sheet assets          
Trading account assets 14,000,000   14,000,000   42,000,000
Debt securities carried at fair value 478,000,000   478,000,000   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 2,626,000,000   2,626,000,000   2,905,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 0   0   0
Total assets 2,359,000,000   2,359,000,000   2,613,000,000
Principal amount outstanding 24,396,000,000   24,396,000,000   27,854,000,000
Unconsolidated VIEs | Non-agency | Subprime | Senior Lien          
On-balance sheet assets          
Trading account assets 54,000,000   54,000,000   94,000,000
Debt securities carried at fair value 2,274,000,000   2,274,000,000   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 29,000,000   29,000,000   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 539,000,000   539,000,000   622,000,000
On-balance sheet assets          
Residual interests held 0   0   0
All other assets 114,000,000   114,000,000   153,000,000
Total assets 539,000,000   539,000,000   622,000,000
Principal amount outstanding 35,969,000,000   35,969,000,000   40,848,000,000
Unconsolidated VIEs | Non-agency | Alt-A Loan | Senior Lien          
On-balance sheet assets          
Trading account assets 84,000,000   84,000,000   99,000,000
Debt securities carried at fair value 315,000,000   315,000,000   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 25,000,000   25,000,000   28,000,000
Held-to-maturity securities 0   0   0
Unconsolidated VIEs | Commercial Mortgage          
Variable Interest Entity [Line Items]          
Maximum loss exposure 332,000,000   332,000,000   326,000,000
On-balance sheet assets          
Residual interests held 32,000,000   32,000,000   48,000,000
All other assets 0   0   0
Total assets 199,000,000   199,000,000   233,000,000
Principal amount outstanding 21,032,000,000   21,032,000,000   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 55,000,000   55,000,000   37,000,000
Unconsolidated VIEs | Commercial Mortgage | Junior Lien          
On-balance sheet assets          
Trading account assets 16,000,000   16,000,000   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 655,000,000   655,000,000    
Consolidated VIEs | Agency          
Variable Interest Entity [Line Items]          
Maximum loss exposure 19,384,000,000   19,384,000,000   26,878,000,000
On-balance sheet assets          
Trading account assets 383,000,000   383,000,000   1,101,000,000
Loans and leases 18,562,000,000   18,562,000,000   25,328,000,000
All other assets 441,000,000   441,000,000   449,000,000
Total assets 19,386,000,000   19,386,000,000   26,878,000,000
On-balance sheet liabilities          
Long-term debt 2,000,000   2,000,000   0
All other liabilities 3,000,000   3,000,000   1,000,000
Total liabilities 5,000,000   5,000,000   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 153,000,000   153,000,000   232,000,000
On-balance sheet assets          
Trading account assets 0   0   188,000,000
Loans and leases 572,000,000   572,000,000   675,000,000
All other assets 70,000,000   70,000,000   54,000,000
Total assets 642,000,000   642,000,000   917,000,000
On-balance sheet liabilities          
Long-term debt 613,000,000   613,000,000   840,000,000
All other liabilities 0   0   0
Total liabilities 613,000,000   613,000,000   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