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 ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
On-balance sheet assets                
Trading account assets $ 187,849,000,000   $ 187,849,000,000     $ 176,527,000,000    
Debt securities carried at fair value 322,505,000,000   322,505,000,000     322,380,000,000    
Held-to-maturity securities 112,409,000,000   112,409,000,000     84,508,000,000    
Loans and leases 905,008,000,000   905,008,000,000     896,983,000,000    
Allowance for loan and lease losses (11,692,000,000) $ (12,657,000,000) (11,692,000,000) $ (12,657,000,000) $ (11,837,000,000) (12,234,000,000) $ (13,068,000,000) $ (14,419,000,000)
All other assets 111,365,000,000   111,365,000,000     114,688,000,000    
Total assets 2,195,314,000,000 2,152,962,000,000 2,195,314,000,000 2,152,962,000,000   2,144,287,000,000    
On-balance sheet liabilities                
Long-term debt 225,136,000,000   225,136,000,000     236,764,000,000    
Total liabilities 1,925,231,000,000   1,925,231,000,000     1,888,111,000,000    
Home Equity Loan, Credit Card and Other Asset-backed Securitization Trusts | Unconsolidated VIEs | Available-for-Sale and Held-to-Maturity Securities                
On-balance sheet liabilities                
Other than temporary impairment losses recorded on debt securities 0 $ 0 0 $ 0        
Home equity | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 3,338,000,000   3,338,000,000     3,988,000,000    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 48,000,000   48,000,000     57,000,000    
Home equity | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 163,000,000   163,000,000     231,000,000    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 263,000,000   263,000,000     321,000,000    
Allowance for loan and lease losses (16,000,000)   (16,000,000)     (18,000,000)    
All other assets 6,000,000   6,000,000     20,000,000    
Total assets 253,000,000   253,000,000     323,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 123,000,000   123,000,000     183,000,000    
All other liabilities 0   0     0    
Total liabilities 123,000,000   123,000,000     183,000,000    
Home equity | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 48,000,000   48,000,000     57,000,000    
Held-to-maturity securities 0   0     0    
Home equity | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 0   0     0    
Credit Card Receivable | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 0   0     0    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 0   0     0    
Credit Card Receivable | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 25,101,000,000   25,101,000,000     32,678,000,000    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 34,872,000,000   34,872,000,000     43,194,000,000    
Allowance for loan and lease losses (1,060,000,000)   (1,060,000,000)     (1,293,000,000)    
All other assets 283,000,000   283,000,000     342,000,000    
Total assets 34,095,000,000   34,095,000,000     42,243,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 8,977,000,000   8,977,000,000     9,550,000,000    
All other liabilities 17,000,000   17,000,000     15,000,000    
Total liabilities 8,994,000,000   8,994,000,000     9,565,000,000    
Credit Card Receivable | Consolidated VIEs | Loans and leases                
On-balance sheet liabilities                
Residual interests held 17,300,000,000   17,300,000,000     24,700,000,000    
Credit Card Receivable | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 0   0     0    
Held-to-maturity securities 0   0     0    
Credit Card Receivable | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 0   0     0    
Resecuritization Trusts | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 10,200,000,000   10,200,000,000     13,046,000,000    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 10,201,000,000   10,201,000,000     13,046,000,000    
Resecuritization Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 180,000,000   180,000,000     354,000,000    
On-balance sheet assets                
Trading account assets 456,000,000   456,000,000     771,000,000    
Loans and leases 0   0     0    
Allowance for loan and lease losses 0   0     0    
All other assets 0   0     0    
Total assets 456,000,000   456,000,000     771,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 276,000,000   276,000,000     417,000,000    
All other liabilities 0   0     0    
Total liabilities 276,000,000   276,000,000     417,000,000    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 670,000,000   670,000,000     1,248,000,000    
Debt securities carried at fair value 2,585,000,000   2,585,000,000     4,341,000,000    
Held-to-maturity securities 6,820,000,000   6,820,000,000     7,370,000,000    
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 55,000,000   55,000,000     17,000,000    
Debt securities carried at fair value 71,000,000   71,000,000     70,000,000    
Municipal Bond Trusts | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 1,760,000,000   1,760,000,000     1,572,000,000    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 26,000,000   26,000,000     2,000,000    
Municipal Bond Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 1,770,000,000   1,770,000,000     1,973,000,000    
On-balance sheet assets                
Trading account assets 1,797,000,000   1,797,000,000     1,984,000,000    
Loans and leases 0   0     0    
Allowance for loan and lease losses 0   0     0    
All other assets 0   0     1,000,000    
Total assets 1,797,000,000   1,797,000,000     1,985,000,000    
On-balance sheet liabilities                
Short-term borrowings 546,000,000   546,000,000     681,000,000    
Long-term debt 12,000,000   12,000,000     12,000,000    
All other liabilities 15,000,000   15,000,000     0    
Total liabilities 573,000,000   573,000,000     693,000,000    
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 26,000,000   26,000,000     2,000,000    
Debt securities carried at fair value 0   0     0    
Held-to-maturity securities 0   0     0    
Municipal Bond Trusts | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 0   0     0    
Automobile and Other Securitization Trusts | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 49,000,000   49,000,000     63,000,000    
On-balance sheet assets                
All other assets 0   0     10,000,000    
Total assets 49,000,000   49,000,000     63,000,000    
Automobile and Other Securitization Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 0   0     0    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 0   0     0    
Allowance for loan and lease losses 0   0     0    
All other assets 0   0     0    
Total assets 0   0     0    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 0   0     0    
All other liabilities 0   0     0    
Total liabilities 0   0     0    
Automobile and Other Securitization Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 49,000,000   49,000,000     53,000,000    
Held-to-maturity securities 0   0     0    
Automobile and Other Securitization Trusts | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 0   0     0    
Unconsolidated VIEs | Home equity                
On-balance sheet assets                
Unconsolidated total assets of VIEs 4,999,000,000   4,999,000,000     5,883,000,000    
Unconsolidated VIEs | Credit Card Receivable                
On-balance sheet assets                
Unconsolidated total assets of VIEs 0   0     0    
Unconsolidated VIEs | Resecuritization Trusts                
On-balance sheet assets                
Unconsolidated total assets of VIEs 24,489,000,000   24,489,000,000     35,362,000,000    
Unconsolidated VIEs | Municipal Bond Trusts                
On-balance sheet assets                
Unconsolidated total assets of VIEs 2,626,000,000   2,626,000,000     2,518,000,000    
Unconsolidated VIEs | Automobile and Other Securitization Trusts                
On-balance sheet assets                
Unconsolidated total assets of VIEs $ 179,000,000   $ 179,000,000     $ 314,000,000