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
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
On-balance sheet assets      
Trading account assets $ 291,733 $ 198,854  
Debt securities carried at fair value 288,913 246,601  
Held-to-maturity securities 651,434 438,279  
Other assets 159,522 135,203  
Total assets 3,029,894 2,819,627 $ 2,741,688
Total liabilities 2,752,775 2,546,703  
Consolidated VIEs      
On-balance sheet assets      
Trading account assets 4,418 5,225  
Other assets 1,134 1,387  
Total assets 21,475 28,555  
Total liabilities 5,476 7,523  
Agency | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 12,573 13,477  
On-balance sheet assets      
Other assets 0 0  
Total assets 12,573 13,477  
Principal balance outstanding 114,769 133,497  
Agency | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 1,080 1,328  
On-balance sheet assets      
Trading account assets 1,080 1,328  
Other assets 0 0  
Total assets 1,080 1,328  
Total liabilities 0 0  
Agency | Senior securities: | Unconsolidated VIEs      
On-balance sheet assets      
Trading account assets 195 152  
Debt securities carried at fair value 6,260 7,588  
Held-to-maturity securities 6,118 5,737  
Non-agency | Prime | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 219 250  
On-balance sheet assets      
Other assets 6 6  
Total assets 98 111  
Principal balance outstanding 5,400 6,081  
Non-agency | Prime | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 17 66  
On-balance sheet assets      
Trading account assets 122 350  
Other assets 0 0  
Total assets 122 350  
Total liabilities 105 284  
Non-agency | Prime | Senior securities: | Unconsolidated VIEs      
On-balance sheet assets      
Trading account assets 5 2  
Debt securities carried at fair value 87 103  
Held-to-maturity securities 0 0  
Non-agency | Subprime | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 1,015 1,031  
On-balance sheet assets      
Other assets 28 26  
Total assets 704 710  
Principal balance outstanding 6,409 6,691  
Non-agency | Subprime | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 23 53  
On-balance sheet assets      
Trading account assets 226 260  
Other assets 0 0  
Total assets 226 260  
Total liabilities 203 207  
Non-agency | Subprime | Senior securities: | Unconsolidated VIEs      
On-balance sheet assets      
Trading account assets 25 8  
Debt securities carried at fair value 651 676  
Held-to-maturity securities 0 0  
Non-agency | Alt-A | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 55 46  
On-balance sheet assets      
Other assets 0 1  
Total assets 55 46  
Principal balance outstanding 15,181 16,554  
Non-agency | Alt-A | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0 0  
On-balance sheet assets      
Trading account assets 0 0  
Other assets 0 0  
Total assets 0 0  
Total liabilities 0 0  
Non-agency | Alt-A | Senior securities: | Unconsolidated VIEs      
On-balance sheet assets      
Trading account assets 24 12  
Debt securities carried at fair value 31 33  
Held-to-maturity securities 0 0  
Commercial Mortgage      
On-balance sheet assets      
Debt securities carried at fair value 18,932    
Commercial Mortgage | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 1,252 1,169  
On-balance sheet assets      
Other assets 57 50  
Total assets 1,080 1,035  
Principal balance outstanding 70,340 59,268  
Commercial Mortgage | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0 0  
On-balance sheet assets      
Trading account assets 0 0  
Other assets 0 0  
Total assets 0 0  
Total liabilities 0 0  
Commercial Mortgage | Senior securities: | Unconsolidated VIEs      
On-balance sheet assets      
Trading account assets 7 60  
Debt securities carried at fair value 0 0  
Held-to-maturity securities $ 1,016 $ 925