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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
On-balance sheet assets                
Trading account assets $ 175,365,000,000   $ 175,365,000,000     $ 176,527,000,000    
Debt securities carried at fair value 309,670,000,000   309,670,000,000     322,380,000,000    
Held-to-maturity securities 102,279,000,000   102,279,000,000     84,625,000,000    
Loans and leases 903,153,000,000   903,153,000,000     896,983,000,000    
Allowance for loan and lease losses (11,837,000,000) $ (13,068,000,000) (11,837,000,000) $ (13,068,000,000) $ (12,069,000,000) (12,234,000,000) $ (13,676,000,000) $ (14,419,000,000)
All other assets 108,700,000,000   108,700,000,000     114,600,000,000    
Total assets 2,186,609,000,000 2,149,034,000,000 2,186,609,000,000 2,149,034,000,000   2,144,316,000,000    
On-balance sheet liabilities                
Short-term borrowings 211,113,000,000   211,113,000,000     202,389,000,000    
Long-term debt 229,617,000,000   229,617,000,000     236,764,000,000    
Total liabilities 1,919,540,000,000   1,919,540,000,000     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 3,585,000,000   3,585,000,000     3,988,000,000    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 51,000,000   51,000,000     57,000,000    
Home equity | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 176,000,000   176,000,000     231,000,000    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 284,000,000   284,000,000     321,000,000    
Allowance for loan and lease losses (17,000,000)   (17,000,000)     (18,000,000)    
All other assets 8,000,000   8,000,000     20,000,000    
Total assets 275,000,000   275,000,000     323,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 140,000,000   140,000,000     183,000,000    
All other liabilities 0   0     0    
Total liabilities 140,000,000   140,000,000     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 51,000,000   51,000,000     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 25,708,000,000   25,708,000,000     32,678,000,000    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 35,587,000,000   35,587,000,000     43,194,000,000    
Allowance for loan and lease losses (1,101,000,000)   (1,101,000,000)     (1,293,000,000)    
All other assets 287,000,000   287,000,000     342,000,000    
Total assets 34,773,000,000   34,773,000,000     42,243,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 9,044,000,000   9,044,000,000     9,550,000,000    
All other liabilities 21,000,000   21,000,000     15,000,000    
Total liabilities 9,065,000,000   9,065,000,000     9,565,000,000    
Credit Card Receivable | Consolidated VIEs | Loans and leases                
On-balance sheet liabilities                
Residual interests held 17,900,000,000   17,900,000,000     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 11,460,000,000   11,460,000,000     13,043,000,000    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 11,460,000,000   11,460,000,000     13,043,000,000    
Resecuritization Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 224,000,000   224,000,000     354,000,000    
On-balance sheet assets                
Trading account assets 616,000,000   616,000,000     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 616,000,000   616,000,000     771,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 392,000,000   392,000,000     417,000,000    
All other liabilities 0   0     0    
Total liabilities 392,000,000   392,000,000     417,000,000    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 1,496,000,000   1,496,000,000     1,248,000,000    
Debt securities carried at fair value 2,835,000,000   2,835,000,000     4,341,000,000    
Held-to-maturity securities 7,008,000,000   7,008,000,000     7,367,000,000    
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 51,000,000   51,000,000     17,000,000    
Debt securities carried at fair value 70,000,000   70,000,000     70,000,000    
Municipal Bond Trusts | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 1,508,000,000   1,508,000,000     1,572,000,000    
On-balance sheet assets                
All other assets 0   0     0    
Total assets 11,000,000   11,000,000     2,000,000    
Municipal Bond Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 1,860,000,000   1,860,000,000     1,973,000,000    
On-balance sheet assets                
Trading account assets 1,862,000,000   1,862,000,000     1,984,000,000    
Loans and leases 0   0     0    
Allowance for loan and lease losses 0   0     0    
All other assets 18,000,000   18,000,000     1,000,000    
Total assets 1,880,000,000   1,880,000,000     1,985,000,000    
On-balance sheet liabilities                
Short-term borrowings 639,000,000   639,000,000     681,000,000    
Long-term debt 12,000,000   12,000,000     12,000,000    
All other liabilities 8,000,000   8,000,000     0    
Total liabilities 659,000,000   659,000,000     693,000,000    
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 11,000,000   11,000,000     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 50,000,000   50,000,000     63,000,000    
On-balance sheet assets                
All other assets 0   0     10,000,000    
Total assets 50,000,000   50,000,000     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 50,000,000   50,000,000     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 5,325,000,000   5,325,000,000     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 36,190,000,000   36,190,000,000     35,362,000,000    
Unconsolidated VIEs | Municipal Bond Trusts                
On-balance sheet assets                
Unconsolidated total assets of VIEs 2,286,000,000   2,286,000,000     2,518,000,000    
Unconsolidated VIEs | Automobile and Other Securitization Trusts                
On-balance sheet assets                
Unconsolidated total assets of VIEs $ 184,000,000   $ 184,000,000     $ 314,000,000