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 ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
On-balance sheet assets        
Trading account assets $ 176,527,000,000 $ 191,785,000,000    
Debt securities carried at fair value 322,380,000,000 320,695,000,000    
Held-to-maturity securities 84,625,000,000 59,766,000,000    
Loans and leases 903,001,000,000 881,391,000,000    
Allowance for loan and lease losses (12,234,000,000) (14,419,000,000) $ (17,428,000,000) $ (24,179,000,000)
Loans held-for-sale 7,453,000,000 12,836,000,000    
All other assets 108,582,000,000 112,063,000,000    
Total assets 2,144,316,000,000 2,104,534,000,000    
On-balance sheet liabilities        
Long-term debt 236,764,000,000 243,139,000,000    
Total liabilities 1,888,111,000,000 1,861,063,000,000    
Other than temporary impairment losses recorded on debt securities 81,000,000 16,000,000 $ 20,000,000  
Unconsolidated VIEs        
On-balance sheet liabilities        
Other than temporary impairment losses recorded on debt securities 0 0    
Home equity lines of credit | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 3,988,000,000 4,801,000,000    
On-balance sheet assets        
All other assets 0 0    
Total assets 57,000,000 53,000,000    
Home equity lines of credit | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 231,000,000 991,000,000    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 321,000,000 1,014,000,000    
Allowance for loan and lease losses (18,000,000) (56,000,000)    
Loans held-for-sale 0 0    
All other assets 20,000,000 33,000,000    
Total assets 323,000,000 991,000,000    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 183,000,000 1,076,000,000    
All other liabilities 0 0    
Total liabilities 183,000,000 1,076,000,000    
Home equity lines of credit | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 12,000,000    
Debt securities carried at fair value 0 0    
Held-to-maturity securities 0 0    
Home equity lines of credit | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 2,000,000    
Debt securities carried at fair value 57,000,000 39,000,000    
Credit Card Receivable | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 0 0    
On-balance sheet assets        
All other assets 0 0    
Total assets 0 0    
Credit Card Receivable | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 32,678,000,000 43,139,000,000    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 43,194,000,000 53,068,000,000    
Allowance for loan and lease losses (1,293,000,000) (1,904,000,000)    
Loans held-for-sale 0 0    
All other assets 342,000,000 392,000,000    
Total assets 42,243,000,000 51,556,000,000    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 9,550,000,000 8,401,000,000    
All other liabilities 15,000,000 16,000,000    
Total liabilities 9,565,000,000 8,417,000,000    
Residual interests held 24,700,000,000 36,900,000,000    
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        
Trading account assets 0 0    
Debt securities carried at fair value 0 0    
Resecuritization Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 13,043,000,000 8,569,000,000    
On-balance sheet assets        
All other assets 0 0    
Total assets 13,043,000,000 8,569,000,000    
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 354,000,000 654,000,000    
On-balance sheet assets        
Trading account assets 771,000,000 1,295,000,000    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
Loans held-for-sale 0 0    
All other assets 0 0    
Total assets 771,000,000 1,295,000,000    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 417,000,000 641,000,000    
All other liabilities 0 0    
Total liabilities 417,000,000 641,000,000    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 1,248,000,000 767,000,000    
Debt securities carried at fair value 4,341,000,000 6,945,000,000    
Held-to-maturity securities 7,367,000,000 740,000,000    
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 17,000,000 44,000,000    
Debt securities carried at fair value 70,000,000 73,000,000    
Municipal Bond Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,572,000,000 2,100,000,000    
On-balance sheet assets        
All other assets 0 0    
Total assets 2,000,000 25,000,000    
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,973,000,000 2,440,000,000    
On-balance sheet assets        
Trading account assets 1,984,000,000 2,452,000,000    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
Loans held-for-sale 0 0    
All other assets 1,000,000 0    
Total assets 1,985,000,000 2,452,000,000    
On-balance sheet liabilities        
Short-term borrowings 681,000,000 1,032,000,000    
Long-term debt 12,000,000 12,000,000    
All other liabilities 0 0    
Total liabilities 693,000,000 1,044,000,000    
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 2,000,000 25,000,000    
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        
Trading account assets 0 0    
Debt securities carried at fair value 0 0    
Automobile and Other Securitization Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 63,000,000 77,000,000    
On-balance sheet assets        
All other assets 10,000,000 10,000,000    
Total assets 63,000,000 77,000,000    
Automobile and Other Securitization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 0 92,000,000    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
Loans held-for-sale 0 555,000,000    
All other assets 0 54,000,000    
Total assets 0 609,000,000    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 0 516,000,000    
All other liabilities 0 1,000,000    
Total liabilities 0 517,000,000    
Automobile and Other Securitization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 6,000,000    
Debt securities carried at fair value 53,000,000 61,000,000    
Held-to-maturity securities 0 0    
Automobile and Other Securitization Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 0    
Debt securities carried at fair value 0 0    
Unconsolidated VIEs | Home equity lines of credit        
On-balance sheet assets        
Unconsolidated total assets of VIEs 5,883,000,000 6,362,000,000    
Unconsolidated VIEs | Credit Card Receivable        
On-balance sheet assets        
Unconsolidated total assets of VIEs 0 0    
Unconsolidated VIEs | Resecuritization Trusts        
On-balance sheet assets        
Unconsolidated total assets of VIEs 35,362,000,000 28,065,000,000    
Unconsolidated VIEs | Municipal Bond Trusts        
On-balance sheet assets        
Unconsolidated total assets of VIEs 2,518,000,000 3,314,000,000    
Unconsolidated VIEs | Automobile and Other Securitization Trusts        
On-balance sheet assets        
Unconsolidated total assets of VIEs $ 314,000,000 $ 1,276,000,000