Annual report pursuant to Section 13 and 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
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
On-balance sheet assets          
Trading account assets $ 198,854 $ 229,826      
Debt securities carried at fair value 246,601 256,467      
Held-to-maturity securities 438,279 215,730      
Total assets 2,819,627 2,434,079      
Loans and leases 927,861 983,426      
Allowance for loan and lease losses (1) (18,802) (9,416) $ (9,601) $ (9,601) $ (10,393)
Other assets 135,203 129,690      
On-balance sheet liabilities          
Long-term debt 262,934 240,856      
Total liabilities 2,546,703 2,169,269      
Consolidated VIEs          
On-balance sheet assets          
Trading account assets 5,225 5,811      
Total assets 28,555 44,381      
Loans and leases 23,636 38,837      
Allowance for loan and lease losses (1) (1,693) (807)      
Other assets 1,387 540      
On-balance sheet liabilities          
Long-term debt 7,053 8,718      
All other liabilities (1) 16 22      
Total liabilities 7,523 10,915      
Home equity | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum loss exposure 206 412      
On-balance sheet assets          
Total retained positions 2 11      
Total assets 609 1,023      
Home equity | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum loss exposure 58 64      
On-balance sheet assets          
Trading account assets 0 0      
Total assets 236 123      
Loans and leases 218 122      
Allowance for loan and lease losses (1) 14 (2)      
Other assets 4 3      
On-balance sheet liabilities          
Short-term borrowings 0 0      
Long-term debt 178 64      
All other liabilities (1) 0 0      
Total liabilities 178 64      
Home equity | Senior securities: | Unconsolidated VIEs          
On-balance sheet assets          
Trading account assets 0 0      
Debt securities carried at fair value 2 11      
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 14,606 17,915      
On-balance sheet assets          
Trading account assets 0 0      
Total assets 20,895 26,304      
Loans and leases 21,310 26,985      
Allowance for loan and lease losses (1) (1,704) (800)      
Other assets 1,289 119      
On-balance sheet liabilities          
Short-term borrowings 0 0      
Long-term debt 6,273 8,372      
All other liabilities (1) 16 17      
Total liabilities 6,289 8,389      
Residual interests 7,600 10,500      
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 8,543 7,526      
On-balance sheet assets          
Total retained positions 8,543 7,526      
Total assets 17,250 21,234      
Resecuritization Trusts | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum loss exposure 217 54      
On-balance sheet assets          
Trading account assets 217 73      
Total assets 217 73      
Loans and leases 0 0      
Allowance for loan and lease losses (1) 0 0      
Other assets 0 0      
On-balance sheet liabilities          
Short-term borrowings 0 0      
Long-term debt 0 19      
All other liabilities (1) 0 0      
Total liabilities 0 19      
Resecuritization Trusts | Senior securities: | Unconsolidated VIEs          
On-balance sheet assets          
Trading account assets 948 2,188      
Debt securities carried at fair value 2,727 1,126      
Held-to-maturity securities 4,868 4,212      
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum loss exposure 3,507 3,701      
On-balance sheet assets          
Total retained positions 0 0      
Total assets 4,042 4,395      
Municipal Bond Trusts | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum loss exposure 1,030 2,656      
On-balance sheet assets          
Trading account assets 990 2,480      
Total assets 1,030 2,656      
Loans and leases 0 0      
Allowance for loan and lease losses (1) 0 0      
Other assets 40 176      
On-balance sheet liabilities          
Short-term borrowings 432 2,175      
Long-term debt 0 0      
All other liabilities (1) 0 0      
Total liabilities 432 2,175      
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