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
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
On-balance sheet assets        
Trading account assets $ 178,987,000,000   $ 176,527,000,000  
Debt securities carried at fair value 302,333,000,000   322,380,000,000  
Held-to-maturity securities 97,978,000,000   84,625,000,000  
Loans and leases 901,113,000,000   896,983,000,000  
Allowance for loan and lease losses (12,069,000,000) $ (13,676,000,000) (12,234,000,000) $ (14,419,000,000)
All other assets 109,913,000,000   114,600,000,000  
Total assets 2,185,498,000,000 2,143,545,000,000 2,144,316,000,000  
On-balance sheet liabilities        
Short-term borrowings 219,841,000,000   202,389,000,000  
Long-term debt 232,849,000,000   236,764,000,000  
Total liabilities 1,922,722,000,000   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    
Home equity | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 3,791,000,000   3,988,000,000  
On-balance sheet assets        
All other assets 0   0  
Total assets 54,000,000   57,000,000  
Home equity | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 224,000,000   231,000,000  
On-balance sheet assets        
Trading account assets 0   0  
Loans and leases 304,000,000   321,000,000  
Allowance for loan and lease losses (17,000,000)   (18,000,000)  
All other assets 20,000,000   20,000,000  
Total assets 307,000,000   323,000,000  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 169,000,000   183,000,000  
All other liabilities (includes $12 and $20 of non-recourse liabilities) 0   0  
Total liabilities 169,000,000   183,000,000  
Home equity | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 54,000,000   57,000,000  
Held-to-maturity securities 0   0  
Home equity | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 0   0  
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 26,842,000,000   32,678,000,000  
On-balance sheet assets        
Trading account assets 0   0  
Loans and leases 35,956,000,000   43,194,000,000  
Allowance for loan and lease losses (1,126,000,000)   (1,293,000,000)  
All other assets 314,000,000   342,000,000  
Total assets 35,144,000,000   42,243,000,000  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 8,293,000,000   9,550,000,000  
All other liabilities (includes $12 and $20 of non-recourse liabilities) 9,000,000   15,000,000  
Total liabilities 8,302,000,000   9,565,000,000  
Credit Card Receivable | Consolidated VIEs | Loans and leases        
On-balance sheet liabilities        
Residual interests held 19,100,000,000   24,700,000,000  
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 11,973,000,000   13,043,000,000  
On-balance sheet assets        
All other assets 0   0  
Total assets 11,973,000,000   13,043,000,000  
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 308,000,000   354,000,000  
On-balance sheet assets        
Trading account assets 743,000,000   771,000,000  
Loans and leases 0   0  
Allowance for loan and lease losses 0   0  
All other assets 0   0  
Total assets 743,000,000   771,000,000  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 435,000,000   417,000,000  
All other liabilities (includes $12 and $20 of non-recourse liabilities) 0   0  
Total liabilities 435,000,000   417,000,000  
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 1,350,000,000   1,248,000,000  
Debt securities carried at fair value 3,330,000,000   4,341,000,000  
Held-to-maturity securities 7,207,000,000   7,367,000,000  
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 16,000,000   17,000,000  
Debt securities carried at fair value 70,000,000   70,000,000  
Municipal Bond Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,536,000,000   1,572,000,000  
On-balance sheet assets        
All other assets 0   0  
Total assets 53,000,000   2,000,000  
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,977,000,000   1,973,000,000  
On-balance sheet assets        
Trading account assets 1,980,000,000   1,984,000,000  
Loans and leases 0   0  
Allowance for loan and lease losses 0   0  
All other assets 9,000,000   1,000,000  
Total assets 1,989,000,000   1,985,000,000  
On-balance sheet liabilities        
Short-term borrowings 665,000,000   681,000,000  
Long-term debt 12,000,000   12,000,000  
All other liabilities (includes $12 and $20 of non-recourse liabilities) 4,000,000   0  
Total liabilities 681,000,000   693,000,000  
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 53,000,000   2,000,000  
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 60,000,000   63,000,000  
On-balance sheet assets        
All other assets 9,000,000   10,000,000  
Total assets 60,000,000   63,000,000  
Automobile and Other Securitization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 0   0  
On-balance sheet assets        
Trading account assets 0   0  
Loans and leases 0   0  
Allowance for loan and lease losses 0   0  
All other assets 0   0  
Total assets 0   0  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 0   0  
All other liabilities (includes $12 and $20 of non-recourse liabilities) 0   0  
Total liabilities 0   0  
Automobile and Other Securitization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 51,000,000   53,000,000  
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        
On-balance sheet assets        
Unconsolidated total assets of VIEs 5,619,000,000   5,883,000,000  
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 34,669,000,000   35,362,000,000  
Unconsolidated VIEs | Municipal Bond Trusts        
On-balance sheet assets        
Unconsolidated total assets of VIEs 2,374,000,000   2,518,000,000  
Unconsolidated VIEs | Automobile and Other Securitization Trusts        
On-balance sheet assets        
Unconsolidated total assets of VIEs $ 183,000,000   $ 314,000,000