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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
On-balance sheet assets        
Trading account assets $ 209,358 $ 180,209    
Debt securities carried at fair value 315,117 313,660    
Held-to-maturity securities 125,013 117,071    
Securities 440,130 430,731    
Loans and leases 936,749 906,683    
Allowance for loan and lease losses (10,393) (11,237) $ (12,234) $ (14,419)
All other assets 132,741 123,996    
Total assets 2,281,234 2,188,067    
On-balance sheet liabilities        
Long-term debt 227,402 216,823    
Total liabilities 2,014,088 1,921,872    
Consolidated VIEs        
On-balance sheet assets        
Trading account assets 6,521 5,773    
Loans and leases 48,929 56,001    
Allowance for loan and lease losses (1,016) (1,032)    
All other assets 1,694 1,596    
Total assets 56,155 62,526    
On-balance sheet liabilities        
Long-term debt 9,873 10,646    
All other liabilities 37 41    
Total liabilities 10,222 11,035    
Home equity lines of credit | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,522 2,732    
On-balance sheet assets        
Total assets 36 46    
Unconsolidated total assets of VIEs 2,432 4,274    
Home equity lines of credit | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 112 149    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 177 244    
Allowance for loan and lease losses (9) (16)    
All other assets 6 7    
Total assets 174 235    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 76 108    
All other liabilities 0 0    
Total liabilities 76 108    
Home equity lines of credit | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 0    
Debt securities carried at fair value 36 46    
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 24,337 25,859    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 32,554 35,135    
Allowance for loan and lease losses (988) (1,007)    
All other assets 1,385 793    
Total assets 32,951 34,921    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 8,598 9,049    
All other liabilities 16 13    
Total liabilities 8,614 9,062    
Residual interests 15,600 17,600    
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 8,204 9,906    
On-balance sheet assets        
Total assets 8,204 9,906    
Unconsolidated total assets of VIEs 19,281 22,155    
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 628 420    
On-balance sheet assets        
Trading account assets 1,557 1,428    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
All other assets 0 0    
Total assets 1,557 1,428    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 929 1,008    
All other liabilities 0 0    
Total liabilities 929 1,008    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 869 902    
Debt securities carried at fair value 1,661 2,338    
Held-to-maturity securities 5,644 6,569    
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Securities 30 97    
Municipal Bond Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,631 1,635    
On-balance sheet assets        
Total assets 33 0    
Unconsolidated total assets of VIEs 2,287 2,406    
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,453 1,442    
On-balance sheet assets        
Trading account assets 1,452 1,454    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
All other assets 1 0    
Total assets 1,453 1,454    
On-balance sheet liabilities        
Short-term borrowings 312 348    
Long-term debt 0 12    
All other liabilities 0 0    
Total liabilities 312 360    
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 33 0    
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