Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Home Equity Loan, Credit Card and Other Asset-backed VIEs (Details)

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Securitizations and Other Variable Interest Entities - Home Equity Loan, Credit Card and Other Asset-backed VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
On-balance sheet assets            
Trading account assets $ 288,566   $ 198,854      
Debt securities carried at fair value 285,377   246,601      
Held-to-maturity securities 683,274   438,279      
Total assets 3,085,446   2,819,627 $ 2,738,452    
Loans and leases 927,736   927,861      
Allowance for loan and lease losses (13,155) $ (14,095) (18,802) $ (19,596) $ (19,389) $ (12,358)
Other assets 160,427   135,203      
On-balance sheet liabilities            
Long-term debt 278,621   262,934      
Total liabilities 2,812,982   2,546,703      
Consolidated VIEs            
On-balance sheet assets            
Trading account assets 4,432   5,225      
Total assets 20,431   28,555      
Loans and leases 16,857   23,636      
Allowance for loan and lease losses (994)   (1,693)      
Other assets 136   1,387      
On-balance sheet liabilities            
Long-term debt 3,830   7,053      
All other liabilities 10   16      
Total liabilities 4,170   7,523      
Home equity | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 167   206      
On-balance sheet assets            
Total retained positions 1   2      
Total assets 455   609      
Home equity | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 48   58      
On-balance sheet assets            
Trading account assets 0   0      
Total assets 185   236      
Loans and leases 168   218      
Allowance for loan and lease losses 14   14      
Other assets 3   4      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 138   178      
All other liabilities 0   0      
Total liabilities 138   178      
Home equity | Senior securities: | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 0   0      
Debt securities carried at fair value 1   2      
Held-to-maturity securities 0   0      
Credit card | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 0   0      
On-balance sheet assets            
Total retained positions 0   0      
Total assets 0   0      
Credit card | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 9,944   14,606      
On-balance sheet assets            
Trading account assets 0   0      
Total assets 13,201   20,895      
Loans and leases 14,139   21,310      
Allowance for loan and lease losses (1,005)   (1,704)      
Other assets 67   1,289      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 3,247   6,273      
All other liabilities 10   16      
Total liabilities 3,257   6,289      
Residual interests 4,000   7,600      
Credit card | 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      
Resecuritization Trusts | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 6,896   8,543      
On-balance sheet assets            
Total retained positions 6,896   8,543      
Total assets 16,665   17,250      
Resecuritization Trusts | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 211   217      
On-balance sheet assets            
Trading account assets 219   217      
Total assets 219   217      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
Other assets 0   0      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 8   0      
All other liabilities 0   0      
Total liabilities 8   0      
Resecuritization Trusts | Senior securities: | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 1,306   948      
Debt securities carried at fair value 2,087   2,727      
Held-to-maturity securities 3,503   4,868      
Municipal Bond Trusts | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 3,862   3,507      
On-balance sheet assets            
Total retained positions 0   0      
Total assets 4,417   4,042      
Municipal Bond Trusts | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 301   1,030      
On-balance sheet assets            
Trading account assets 261   990      
Total assets 301   1,030      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
Other assets 40   40      
On-balance sheet liabilities            
Short-term borrowings 280   432      
Long-term debt 0   0      
All other liabilities 0   0      
Total liabilities 280   432      
Municipal Bond Trusts | 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