Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Mortgage and Home Equity Securitizations (Details)

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Securitizations and Other Variable Interest Entities - Mortgage and Home Equity Securitizations (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
On-balance sheet assets            
Trading account assets $ 342,135   $ 277,354      
Debt securities carried at fair value 325,436   276,852      
Held-to-maturity securities 567,589   594,591      
Loans and leases 1,075,800   1,053,732      
Allowance for loan and lease losses (13,251) $ (13,238) (13,342) $ (13,287) $ (12,950) $ (12,682)
All other assets 168,320   160,875      
Total assets 3,324,293   3,180,151 $ 3,153,090    
Total liabilities 3,027,781   2,888,505      
Consolidated VIEs            
On-balance sheet assets            
Trading account assets 6,280   6,054      
Loans and leases 19,267   18,276      
Allowance for loan and lease losses (923)   (826)      
All other assets 278   269      
Total assets 24,902   23,773      
Total liabilities 12,437   11,432      
Agency | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 7,737   8,190      
On-balance sheet assets            
All other assets 0   0      
Total assets 7,737   8,190      
Principal balance outstanding 70,513   76,134      
Agency | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,327   1,164      
On-balance sheet assets            
Trading account assets 1,327   1,171      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 0   0      
Total assets 1,327   1,171      
Total liabilities 0   7      
Agency | Senior securities: | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 250   235      
Debt securities carried at fair value 2,379   2,541      
Held-to-maturity securities 5,108   5,414      
Residential Mortgage | Prime and Alt-A | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 87   92      
On-balance sheet assets            
All other assets 2   4      
Total assets 13   17      
Principal balance outstanding 12,994   13,963      
Residential Mortgage | Prime and Alt-A | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 0   0      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 0   0      
Total assets 0   0      
Total liabilities 0   0      
Residential Mortgage | Prime and Alt-A | Senior securities: | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 11   13      
Debt securities carried at fair value 0   0      
Held-to-maturity securities 0   0      
Residential Mortgage | Subprime | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 619   657      
On-balance sheet assets            
All other assets 24   23      
Total assets 344   384      
Principal balance outstanding 5,038   4,508      
Residential Mortgage | Subprime | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 0   0      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 0   0      
Total assets 0   0      
Total liabilities 0   0      
Residential Mortgage | Subprime | Senior securities: | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 20   20      
Debt securities carried at fair value 300   341      
Held-to-maturity securities 0   0      
Home Equity | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 0   0      
On-balance sheet assets            
All other assets 0   0      
Total assets 0   0      
Principal balance outstanding 196   252      
Home Equity | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 10   12      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 24   31      
Allowance for loan and lease losses 6   7      
All other assets 1   1      
Total assets 31   39      
Total liabilities 21   27      
Home Equity | Senior securities: | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 0   0      
Debt securities carried at fair value 0   0      
Held-to-maturity securities 0   0      
Commercial Mortgage            
On-balance sheet assets            
Debt securities carried at fair value 18,997          
Commercial Mortgage | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,556   1,558      
On-balance sheet assets            
All other assets 37   79      
Total assets 1,463   1,436      
Principal balance outstanding 85,274   80,078      
Commercial Mortgage | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 0   0      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All 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 207   70      
Debt securities carried at fair value 0   0      
Held-to-maturity securities $ 1,219   $ 1,287