Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - First Lien Mortgages VIE (Details)

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Securitizations and Other Variable Interest Entities - First Lien Mortgages VIE (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
On-balance sheet assets      
Trading account assets $ 209,044,000,000   $ 180,209,000,000
Debt securities carried at fair value 312,012,000,000   313,660,000,000
Held-to-maturity securities 116,033,000,000   117,071,000,000
Loans and leases 906,242,000,000   906,683,000,000
All other assets 115,705,000,000   120,709,000,000
Total assets 2,247,701,000,000 $ 2,185,726,000,000 2,187,702,000,000
On-balance sheet liabilities      
Long-term debt 221,385,000,000   216,823,000,000
Total liabilities 1,979,548,000,000   1,920,862,000,000
Other than temporary impairment losses recorded on debt securities 27,000,000 7,000,000  
Unpaid principal balance of mortgage loans eligible for repurchase 118,000,000   189,000,000
Principal amount that would be payable to the securitization vehicles 118,000,000   189,000,000
Unconsolidated VIEs | Residential Mortgage - Agency      
Variable Interest Entity [Line Items]      
Maximum loss exposure 20,855,000,000   22,661,000,000
On-balance sheet assets      
Residual interests held 0   0
All other assets 12,000,000   12,000,000
Total assets 20,855,000,000   22,661,000,000
Principal balance outstanding 257,948,000,000   265,332,000,000
Unconsolidated VIEs | Residential Mortgage - Agency | Senior Lien      
On-balance sheet assets      
Trading account assets 519,000,000   1,399,000,000
Debt securities carried at fair value 16,774,000,000   17,620,000,000
Held-to-maturity securities 3,550,000,000   3,630,000,000
Unconsolidated VIEs | Residential Mortgage - Agency | Junior Lien      
On-balance sheet assets      
Trading account assets 0   0
Debt securities carried at fair value 0   0
Held-to-maturity securities 0   0
Unconsolidated VIEs | Non-agency | Prime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 704,000,000   757,000,000
On-balance sheet assets      
Residual interests held 0   0
All other assets 26,000,000   28,000,000
Total assets 464,000,000   498,000,000
Principal balance outstanding 12,408,000,000   16,280,000,000
Unconsolidated VIEs | Non-agency | Prime | Senior Lien      
On-balance sheet assets      
Trading account assets 18,000,000   20,000,000
Debt securities carried at fair value 411,000,000   441,000,000
Held-to-maturity securities 0   0
Unconsolidated VIEs | Non-agency | Prime | Junior Lien      
On-balance sheet assets      
Trading account assets 1,000,000   1,000,000
Debt securities carried at fair value 8,000,000   8,000,000
Held-to-maturity securities 0   0
Unconsolidated VIEs | Non-agency | Subprime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 2,642,000,000   2,750,000,000
On-balance sheet assets      
Residual interests held 0   0
All other assets 0   0
Total assets 2,262,000,000   2,372,000,000
Principal balance outstanding 18,385,000,000   19,373,000,000
Unconsolidated VIEs | Non-agency | Subprime | Senior Lien      
On-balance sheet assets      
Trading account assets 33,000,000   112,000,000
Debt securities carried at fair value 2,211,000,000   2,235,000,000
Held-to-maturity securities 0   0
Unconsolidated VIEs | Non-agency | Subprime | Junior Lien      
On-balance sheet assets      
Trading account assets 16,000,000   23,000,000
Debt securities carried at fair value 2,000,000   2,000,000
Held-to-maturity securities 0   0
Unconsolidated VIEs | Non-agency | Alt-A      
Variable Interest Entity [Line Items]      
Maximum loss exposure 529,000,000   560,000,000
On-balance sheet assets      
Residual interests held 0   0
All other assets 105,000,000   113,000,000
Total assets 529,000,000   560,000,000
Principal balance outstanding 32,779,000,000   35,788,000,000
Unconsolidated VIEs | Non-agency | Alt-A | Senior Lien      
On-balance sheet assets      
Trading account assets 99,000,000   118,000,000
Debt securities carried at fair value 302,000,000   305,000,000
Held-to-maturity securities 0   0
Unconsolidated VIEs | Non-agency | Alt-A | Junior Lien      
On-balance sheet assets      
Trading account assets 1,000,000   1,000,000
Debt securities carried at fair value 22,000,000   23,000,000
Held-to-maturity securities 0   0
Unconsolidated VIEs | Commercial Mortgage      
Variable Interest Entity [Line Items]      
Maximum loss exposure 271,000,000   344,000,000
On-balance sheet assets      
Residual interests held 23,000,000   25,000,000
All other assets 0   0
Total assets 155,000,000   221,000,000
Principal balance outstanding 17,400,000,000   23,826,000,000
Unconsolidated VIEs | Commercial Mortgage | Senior Lien      
On-balance sheet assets      
Trading account assets 35,000,000   51,000,000
Debt securities carried at fair value 0   0
Held-to-maturity securities 44,000,000   64,000,000
Unconsolidated VIEs | Commercial Mortgage | Junior Lien      
On-balance sheet assets      
Trading account assets 5,000,000   14,000,000
Debt securities carried at fair value 48,000,000   54,000,000
Held-to-maturity securities 0   13,000,000
Unconsolidated VIEs | First Lien Mortgage Securitization Trusts      
On-balance sheet liabilities      
Other than temporary impairment losses recorded on debt securities 15,000,000 2,000,000  
Other than temporary impairment losses recorded on held-to-maturity securities 0 $ 0  
Consolidated VIEs | Residential Mortgage - Agency      
Variable Interest Entity [Line Items]      
Maximum loss exposure 16,795,000,000   18,084,000,000
On-balance sheet assets      
Trading account assets 115,000,000   434,000,000
Loans and leases 16,416,000,000   17,223,000,000
All other assets 264,000,000   427,000,000
Total assets 16,795,000,000   18,084,000,000
On-balance sheet liabilities      
Long-term debt 0   0
All other liabilities 3,000,000   4,000,000
Total liabilities 3,000,000   4,000,000
Consolidated VIEs | Non-agency | Prime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0   0
On-balance sheet assets      
Trading account assets 0   0
Loans and leases 0   0
All other assets 0   0
Total assets 0   0
On-balance sheet liabilities      
Long-term debt 0   0
All other liabilities 0   0
Total liabilities 0   0
Consolidated VIEs | Non-agency | Subprime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0   0
On-balance sheet assets      
Trading account assets 0   0
Loans and leases 0   0
All other assets 0   0
Total assets 0   0
On-balance sheet liabilities      
Long-term debt 0   0
All other liabilities 0   0
Total liabilities 0   0
Consolidated VIEs | Non-agency | Alt-A      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0   25,000,000
On-balance sheet assets      
Trading account assets 0   99,000,000
Loans and leases 0   0
All other assets 0   0
Total assets 0   99,000,000
On-balance sheet liabilities      
Long-term debt 0   74,000,000
All other liabilities 0   0
Total liabilities 0   74,000,000
Consolidated VIEs | Commercial Mortgage      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0   0
On-balance sheet assets      
Trading account assets 0   0
Loans and leases 0   0
All other assets 0   0
Total assets 0   0
On-balance sheet liabilities      
Long-term debt 0   0
All other liabilities 0   0
Total liabilities $ 0   $ 0