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
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
On-balance sheet assets        
Trading account assets $ 276,881 $ 198,854    
Debt securities carried at fair value 280,912 246,601    
Held-to-maturity securities 576,031 438,279    
Total assets 2,969,992 2,819,627 $ 2,619,954  
Loans and leases 903,088 927,861    
Allowance for loan and lease losses (16,168) (18,802) $ (15,766) $ (12,358)
Other assets 156,221 135,203    
On-balance sheet liabilities        
Long-term debt 251,211 262,934    
Total liabilities 2,695,992 2,546,703    
Consolidated VIEs        
On-balance sheet assets        
Trading account assets 4,530 5,225    
Total assets 24,002 28,555    
Loans and leases 19,346 23,636    
Allowance for loan and lease losses (1,261) (1,693)    
Other assets 1,387 1,387    
On-balance sheet liabilities        
Long-term debt 5,286 7,053    
All other liabilities 11 16    
Total liabilities 5,635 7,523    
Home equity | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 193 206    
On-balance sheet assets        
Total retained positions 2 2    
Total assets 557 609    
Home equity | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 55 58    
On-balance sheet assets        
Trading account assets 0 0    
Total assets 220 236    
Loans and leases 201 218    
Allowance for loan and lease losses 15 14    
Other assets 4 4    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 165 178    
All other liabilities 0 0    
Total liabilities 165 178    
Home equity | Senior securities: | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 0    
Debt securities carried at fair value 2 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 12,111 14,606    
On-balance sheet assets        
Trading account assets 0 0    
Total assets 16,820 20,895    
Loans and leases 16,798 21,310    
Allowance for loan and lease losses (1,273) (1,704)    
Other assets 1,295 1,289    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 4,698 6,273    
All other liabilities 11 16    
Total liabilities 4,709 6,289    
Residual interests 5,000 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 7,532 8,543    
On-balance sheet assets        
Total retained positions 7,532 8,543    
Total assets 16,056 17,250    
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 377 217    
On-balance sheet assets        
Trading account assets 381 217    
Total assets 381 217    
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 4 0    
All other liabilities 0 0    
Total liabilities 4 0    
Resecuritization Trusts | Senior securities: | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 638 948    
Debt securities carried at fair value 2,500 2,727    
Held-to-maturity securities 4,394 4,868    
Municipal Bond Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 3,569 3,507    
On-balance sheet assets        
Total retained positions 0 0    
Total assets 4,115 4,042    
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 565 1,030    
On-balance sheet assets        
Trading account assets 525 990    
Total assets 565 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 301 432    
Long-term debt 0 0    
All other liabilities 0 0    
Total liabilities 301 432    
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