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, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
On-balance sheet assets            
Trading account assets $ 219,118   $ 209,358      
Debt securities carried at fair value 251,635   315,117      
Held-to-maturity securities 194,472   125,013      
Securities 446,107   440,130      
Loans and leases 929,801   936,749      
Allowance for loan and lease losses (9,734) $ (10,050) (10,393) $ (10,693) $ (10,875) $ (11,237)
All other assets 125,795   135,043      
Total assets 2,338,833   2,281,234 $ 2,284,174    
On-balance sheet liabilities            
Long-term debt 234,100   227,402      
Total liabilities 2,076,675   2,014,088      
Consolidated VIEs            
On-balance sheet assets            
Trading account assets 6,145   6,521      
Loans and leases 44,163   48,929      
Allowance for loan and lease losses (920)   (1,016)      
All other assets 357   1,721      
Total assets 49,745   56,155      
On-balance sheet liabilities            
Long-term debt 11,024   9,873      
All other liabilities 39   37      
Total liabilities 11,968   10,222      
Home Equity Loan | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,101   1,522      
On-balance sheet assets            
Total assets 29   36      
Unconsolidated total assets of VIEs 1,944   2,432      
Home Equity Loan | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 91   112      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 143   177      
Allowance for loan and lease losses (6)   (9)      
All other assets 4   6      
Total assets 141   174      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 59   76      
All other liabilities 0   0      
Total liabilities 59   76      
Home Equity Loan | Senior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 0   0      
Debt securities carried at fair value 29   36      
Held-to-maturity securities 0   0      
Home Equity Loan | Junior Lien | Unconsolidated VIEs            
On-balance sheet assets            
All other assets 0   0      
Credit Card | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 0   0      
On-balance sheet assets            
Total assets 0   0      
Unconsolidated total assets of VIEs 0   0      
Credit Card | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 18,600   24,337      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 29,726   32,554      
Allowance for loan and lease losses (907)   (988)      
All other assets 128   1,385      
Total assets 28,947   32,951      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 10,320   8,598      
All other liabilities 27   16      
Total liabilities 10,347   8,614      
Residual interests 10,800   15,600      
Credit Card | Senior Lien | 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      
Credit Card | Junior Lien | Unconsolidated VIEs            
On-balance sheet assets            
All other assets 0   0      
Resecuritization Trusts | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 8,185   8,204      
On-balance sheet assets            
All other assets 0          
Total assets 8,185   8,204      
Unconsolidated total assets of VIEs 18,469   19,281      
Resecuritization Trusts | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 109   628      
On-balance sheet assets            
Trading account assets 376   1,557      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 0   0      
Total assets 376   1,557      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 267   929      
All other liabilities 0   0      
Total liabilities 267   929      
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 1,757   869      
Debt securities carried at fair value 1,380   1,661      
Held-to-maturity securities 5,048   5,644      
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs            
On-balance sheet assets            
All other assets     30      
Municipal Bond Trusts | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,837   1,631      
On-balance sheet assets            
Total assets 22   33      
Unconsolidated total assets of VIEs 2,560   2,287      
Municipal Bond Trusts | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,726   1,453      
On-balance sheet assets            
Trading account assets 1,740   1,452      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 1   1      
Total assets 1,741   1,453      
On-balance sheet liabilities            
Short-term borrowings 905   312      
Long-term debt 12   0      
All other liabilities 0   0      
Total liabilities 917   312      
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 22   33      
Debt securities carried at fair value 0   0      
Held-to-maturity securities 0   0      
Municipal Bond Trusts | Junior Lien | Unconsolidated VIEs            
On-balance sheet assets            
All other assets $ 0   $ 0