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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
On-balance sheet assets                
Trading account assets $ 216,369,000,000   $ 216,369,000,000     $ 180,209,000,000    
Debt securities carried at fair value 315,509,000,000   315,509,000,000     313,660,000,000    
Held-to-maturity securities 119,008,000,000   119,008,000,000     117,071,000,000    
Loans and leases 916,666,000,000   916,666,000,000     906,683,000,000    
Allowance for loan and lease losses (10,875,000,000) $ (11,837,000,000) (10,875,000,000) $ (11,837,000,000) $ (11,112,000,000) (11,237,000,000) $ (12,069,000,000) $ (12,234,000,000)
All other assets 124,397,000,000   124,397,000,000     120,709,000,000    
Total assets 2,254,529,000,000 2,186,966,000,000 2,254,529,000,000 2,186,966,000,000   2,187,702,000,000    
On-balance sheet liabilities                
Long-term debt 223,923,000,000   223,923,000,000     216,823,000,000    
Total liabilities 1,983,542,000,000   1,983,542,000,000     1,920,862,000,000    
Other than temporary impairment losses recorded on debt securities 6,000,000 5,000,000 33,000,000 12,000,000        
Home equity lines of credit | Unconsolidated VIEs                
On-balance sheet assets                
Unconsolidated total assets of VIEs 3,142,000,000   3,142,000,000     4,274,000,000    
Home equity lines of credit | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 2,283,000,000   2,283,000,000     2,732,000,000    
On-balance sheet assets                
Total assets 41,000,000   41,000,000     46,000,000    
Home equity lines of credit | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 128,000,000   128,000,000     149,000,000    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 208,000,000   208,000,000     244,000,000    
Allowance for loan and lease losses (14,000,000)   (14,000,000)     (16,000,000)    
All other assets 6,000,000   6,000,000     7,000,000    
Total assets 200,000,000   200,000,000     235,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 90,000,000   90,000,000     108,000,000    
All other liabilities 0   0     0    
Total liabilities 90,000,000   90,000,000     108,000,000    
Home equity lines of credit | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 0   0     0    
Debt securities carried at fair value 41,000,000   41,000,000     46,000,000    
Held-to-maturity securities 0   0     0    
Home equity lines of credit | 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                
On-balance sheet assets                
Unconsolidated total assets of VIEs 0   0     0    
Credit Card Receivable | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 0   0     0    
On-balance sheet assets                
Total assets 0   0     0    
Credit Card Receivable | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 23,557,000,000   23,557,000,000     25,859,000,000    
On-balance sheet assets                
Trading account assets 0   0     0    
Loans and leases 32,873,000,000   32,873,000,000     35,135,000,000    
Allowance for loan and lease losses (982,000,000)   (982,000,000)     (1,007,000,000)    
All other assets 687,000,000   687,000,000     793,000,000    
Total assets 32,578,000,000   32,578,000,000     34,921,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 8,998,000,000   8,998,000,000     9,049,000,000    
All other liabilities 23,000,000   23,000,000     13,000,000    
Total liabilities 9,021,000,000   9,021,000,000     9,062,000,000    
Residual interests held 15,400,000,000   15,400,000,000     17,600,000,000    
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                
On-balance sheet assets                
Unconsolidated total assets of VIEs 19,645,000,000   19,645,000,000     22,155,000,000    
Resecuritization Trusts | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 9,561,000,000   9,561,000,000     9,906,000,000    
On-balance sheet assets                
Total assets 9,561,000,000   9,561,000,000     9,906,000,000    
Resecuritization Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 256,000,000   256,000,000     420,000,000    
On-balance sheet assets                
Trading account assets 723,000,000   723,000,000     1,428,000,000    
Loans and leases 0   0     0    
Allowance for loan and lease losses 0   0     0    
All other assets 0   0     0    
Total assets 723,000,000   723,000,000     1,428,000,000    
On-balance sheet liabilities                
Short-term borrowings 0   0     0    
Long-term debt 467,000,000   467,000,000     1,008,000,000    
All other liabilities 0   0     0    
Total liabilities 467,000,000   467,000,000     1,008,000,000    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 1,312,000,000   1,312,000,000     902,000,000    
Debt securities carried at fair value 2,036,000,000   2,036,000,000     2,338,000,000    
Held-to-maturity securities 6,115,000,000   6,115,000,000     6,569,000,000    
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 26,000,000   26,000,000     27,000,000    
Debt securities carried at fair value 72,000,000   72,000,000     70,000,000    
Municipal Bond Trusts | Unconsolidated VIEs                
On-balance sheet assets                
Unconsolidated total assets of VIEs 2,340,000,000   2,340,000,000     2,406,000,000    
Municipal Bond Trusts | Unconsolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 1,617,000,000   1,617,000,000     1,635,000,000    
On-balance sheet assets                
Total assets 9,000,000   9,000,000     0    
Municipal Bond Trusts | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Maximum loss exposure 1,210,000,000   1,210,000,000     1,442,000,000    
On-balance sheet assets                
Trading account assets 1,213,000,000   1,213,000,000     1,454,000,000    
Loans and leases 0   0     0    
Allowance for loan and lease losses 0   0     0    
All other assets 1,000,000   1,000,000     0    
Total assets 1,214,000,000   1,214,000,000     1,454,000,000    
On-balance sheet liabilities                
Short-term borrowings 97,000,000   97,000,000     348,000,000    
Long-term debt 0   0     12,000,000    
All other liabilities 4,000,000   4,000,000     0    
Total liabilities 101,000,000   101,000,000     360,000,000    
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs                
On-balance sheet assets                
Trading account assets 9,000,000   9,000,000     0    
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    
Home Equity Loan, Credit Card and Other Asset-backed Securitization Trusts | Unconsolidated VIEs                
On-balance sheet liabilities                
Other than temporary impairment losses recorded on debt securities 0 2,000,000 1,000,000 2,000,000        
Other than temporary impairment losses recorded on held-to-maturity securities $ 0 $ 0 $ 0 $ 0