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 ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
On-balance sheet assets      
Trading account assets $ 198,477 $ 209,358  
Debt securities carried at fair value 303,298 315,117  
Held-to-maturity securities 123,539 125,013  
Securities 426,837 440,130  
Loans and leases 934,078 936,749  
All other assets 128,833 135,043  
Total assets 2,328,478 2,281,234 $ 2,247,794
On-balance sheet liabilities      
Long-term debt 232,256 227,402  
Total liabilities 2,062,254 2,014,088  
Unpaid principal balance of mortgage loans eligible for repurchase 65 148  
Principal amount that would be payable to the securitization vehicles 65 148  
Unconsolidated VIEs | Residential Mortgage - Agency      
Variable Interest Entity [Line Items]      
Maximum loss exposure 18,120 19,110  
On-balance sheet assets      
Residual interests 0 0  
All other assets 0 10  
Total assets 18,120 19,110  
Principal balance outstanding 216,493 232,761  
Unconsolidated VIEs | Residential Mortgage - Agency | Senior Lien      
On-balance sheet assets      
Trading account assets 658 716  
Debt securities carried at fair value 14,214 15,036  
Held-to-maturity securities 3,248 3,348  
Unconsolidated VIEs | Residential Mortgage - Agency | Junior Lien      
On-balance sheet assets      
Securities 0 0  
Unconsolidated VIEs | Non-agency | Prime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 652 689  
On-balance sheet assets      
Residual interests 0 0  
All other assets 0 0  
Total assets 460 488  
Principal balance outstanding 10,305 10,549  
Unconsolidated VIEs | Non-agency | Prime | Senior Lien      
On-balance sheet assets      
Trading account assets 7 6  
Debt securities carried at fair value 447 477  
Held-to-maturity securities 0 0  
Unconsolidated VIEs | Non-agency | Prime | Junior Lien      
On-balance sheet assets      
Securities 6 5  
Unconsolidated VIEs | Non-agency | Subprime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 2,659 2,643  
On-balance sheet assets      
Residual interests 0 0  
All other assets 0 0  
Total assets 2,283 2,269  
Principal balance outstanding 10,118 10,254  
Unconsolidated VIEs | Non-agency | Subprime | Senior Lien      
On-balance sheet assets      
Trading account assets 15 10  
Debt securities carried at fair value 2,204 2,221  
Held-to-maturity securities 0 0  
Unconsolidated VIEs | Non-agency | Subprime | Junior Lien      
On-balance sheet assets      
Securities 64 38  
Unconsolidated VIEs | Non-agency | Alt-A      
Variable Interest Entity [Line Items]      
Maximum loss exposure 419 403  
On-balance sheet assets      
Residual interests 0 0  
All other assets 0 0  
Total assets 419 403  
Principal balance outstanding 26,865 28,129  
Unconsolidated VIEs | Non-agency | Alt-A | Senior Lien      
On-balance sheet assets      
Trading account assets 74 50  
Debt securities carried at fair value 343 351  
Held-to-maturity securities 0 0  
Unconsolidated VIEs | Non-agency | Alt-A | Junior Lien      
On-balance sheet assets      
Securities 2 2  
Unconsolidated VIEs | Commercial Mortgage      
Variable Interest Entity [Line Items]      
Maximum loss exposure 565 585  
On-balance sheet assets      
Residual interests 24 19  
All other assets 0 0  
Total assets 463 470  
Principal balance outstanding 26,092 26,504  
Unconsolidated VIEs | Commercial Mortgage | Senior Lien      
On-balance sheet assets      
Trading account assets 77 108  
Debt securities carried at fair value 0 0  
Held-to-maturity securities 298 274  
Unconsolidated VIEs | Commercial Mortgage | Junior Lien      
On-balance sheet assets      
Securities 64 69  
Consolidated VIEs      
On-balance sheet assets      
Trading account assets 6,065 6,521  
Loans and leases 46,590 48,929  
All other assets 399 1,694  
Total assets 52,083 56,155  
On-balance sheet liabilities      
Long-term debt 10,051 9,873  
All other liabilities 38 37  
Total liabilities 10,375 10,222  
Consolidated VIEs | Residential Mortgage - Agency      
Variable Interest Entity [Line Items]      
Maximum loss exposure 13,872 14,502  
On-balance sheet assets      
Trading account assets 203 232  
Loans and leases 13,476 14,030  
All other assets 194 240  
Total assets 13,873 14,502  
On-balance sheet liabilities      
Long-term debt 1 0  
All other liabilities 3 3  
Total liabilities 4 3  
Consolidated VIEs | Non-agency | Prime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 662 571  
On-balance sheet assets      
Trading account assets 683 571  
Loans and leases 0 0  
All other assets 0 0  
Total assets 683 571  
On-balance sheet liabilities      
Long-term debt 21 0  
All other liabilities 0 0  
Total liabilities 21 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 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 | 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