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, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
On-balance sheet assets        
Trading account assets $ 198,477 $ 209,358    
Debt securities carried at fair value 303,298 315,117    
Held-to-maturity securities 123,539 125,013    
Securities 426,837 440,130    
Loans and leases 934,078 936,749    
Allowance for loan and lease losses (10,260) (10,393) $ (11,112) $ (11,237)
All other assets 128,833 135,043    
Total assets 2,328,478 2,281,234 $ 2,247,794  
On-balance sheet liabilities        
Long-term debt 232,256 227,402    
Total liabilities 2,062,254 2,014,088    
Consolidated VIEs        
On-balance sheet assets        
Trading account assets 6,065 6,521    
Loans and leases 46,590 48,929    
Allowance for loan and lease losses (984) (1,016)    
All other assets 399 1,694    
Total assets 52,083 56,155    
On-balance sheet liabilities        
Long-term debt 10,051 9,873    
All other liabilities 38 37    
Total liabilities 10,375 10,222    
Home equity lines of credit | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,350 1,522    
On-balance sheet assets        
Total assets 32 36    
Unconsolidated total assets of VIEs 2,238 2,432    
Home equity lines of credit | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 104 112    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 165 177    
Allowance for loan and lease losses (9) (9)    
All other assets 6 6    
Total assets 162 174    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 70 76    
All other liabilities 0 0    
Total liabilities 70 76    
Home equity lines of credit | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 0    
Debt securities carried at fair value 32 36    
Held-to-maturity securities 0 0    
Home equity lines of credit | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Securities 0 0    
Credit Card Receivable | 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 Receivable | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 20,873 24,337    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 30,764 32,554    
Allowance for loan and lease losses (968) (988)    
All other assets 137 1,385    
Total assets 29,933 32,951    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 9,043 8,598    
All other liabilities 17 16    
Total liabilities 9,060 8,614    
Residual interests 13,300 15,600    
Credit Card Receivable | 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 Receivable | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Securities 0 0    
Resecuritization Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 8,680 8,204    
On-balance sheet assets        
Total assets 8,680 8,204    
Unconsolidated total assets of VIEs 19,073 19,281    
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 457 628    
On-balance sheet assets        
Trading account assets 1,053 1,557    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
All other assets 0 0    
Total assets 1,053 1,557    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 596 929    
All other liabilities 0 0    
Total liabilities 596 929    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 1,660 869    
Debt securities carried at fair value 1,557 1,661    
Held-to-maturity securities 5,463 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 1,614 1,631    
On-balance sheet assets        
Total assets 0 33    
Unconsolidated total assets of VIEs 2,249 2,287    
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,436 1,453    
On-balance sheet assets        
Trading account assets 1,447 1,452    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
All other assets 1 1    
Total assets 1,448 1,453    
On-balance sheet liabilities        
Short-term borrowings 286 312    
Long-term debt 12 0    
All other liabilities 0 0    
Total liabilities 298 312    
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