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
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
On-balance sheet assets            
Trading account assets $ 203,420   $ 209,358      
Debt securities carried at fair value 275,256   315,117      
Held-to-maturity securities 163,013   125,013      
Securities 438,269   440,130      
Loans and leases 935,824   936,749      
Allowance for loan and lease losses (10,050) $ (10,260) (10,393) $ (10,875) $ (11,112) $ (11,237)
All other assets 130,288   135,043      
Total assets 2,291,670   2,281,234 $ 2,254,714    
On-balance sheet liabilities            
Long-term debt 226,595   227,402      
Total liabilities 2,027,454   2,014,088      
Consolidated VIEs            
On-balance sheet assets            
Trading account assets 5,692   6,521      
Loans and leases 45,483   48,929      
Allowance for loan and lease losses (959)   (1,016)      
All other assets 396   1,694      
Total assets 50,615   56,155      
On-balance sheet liabilities            
Long-term debt 9,865   9,873      
All other liabilities 39   37      
Total liabilities 10,300   10,222      
Home Equity Loan | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,238   1,522      
On-balance sheet assets            
Total assets 31   36      
Unconsolidated total assets of VIEs 2,085   2,432      
Home Equity Loan | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 97   112      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 154   177      
Allowance for loan and lease losses (7)   (9)      
All other assets 5   6      
Total assets 152   174      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 65   76      
All other liabilities 0   0      
Total liabilities 65   76      
Home Equity Loan | Senior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 0   0      
Debt securities carried at fair value 31   36      
Held-to-maturity securities 0   0      
Home Equity Loan | Junior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Securities 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 20,518   24,337      
On-balance sheet assets            
Trading account assets 0   0      
Loans and leases 30,433   32,554      
Allowance for loan and lease losses (944)   (988)      
All other assets 128   1,385      
Total assets 29,617   32,951      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 9,071   8,598      
All other liabilities 28   16      
Total liabilities 9,099   8,614      
Residual interests 13,000   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            
Securities 0   0      
Resecuritization Trusts | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 8,025   8,204      
On-balance sheet assets            
Total assets 8,025   8,204      
Unconsolidated total assets of VIEs 19,975   19,281      
Resecuritization Trusts | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 264   628      
On-balance sheet assets            
Trading account assets 622   1,557      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 0   0      
Total assets 622   1,557      
On-balance sheet liabilities            
Short-term borrowings 0   0      
Long-term debt 358   929      
All other liabilities 0   0      
Total liabilities 358   929      
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 1,297   869      
Debt securities carried at fair value 1,471   1,661      
Held-to-maturity securities 5,257   5,644      
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Securities 0   30      
Municipal Bond Trusts | Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,726   1,631      
On-balance sheet assets            
Total assets 0   33      
Unconsolidated total assets of VIEs 2,378   2,287      
Municipal Bond Trusts | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Maximum loss exposure 1,480   1,453      
On-balance sheet assets            
Trading account assets 1,492   1,452      
Loans and leases 0   0      
Allowance for loan and lease losses 0   0      
All other assets 1   1      
Total assets 1,493   1,453      
On-balance sheet liabilities            
Short-term borrowings 396   312      
Long-term debt 12   0      
All other liabilities 0   0      
Total liabilities 408   312      
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs            
On-balance sheet assets            
Trading account assets 0   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            
Securities $ 0   $ 0