Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans held-for-sale $ 11,659 $ 7,630  
Other Assets, Fair Value Disclosure 40,983 37,084  
Derivative assets 53,497 73,023  
Other assets [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
More significant transfers into Level 3 0 [1],[2] 375 [1],[2] 0
More significant transfers out of Level 3 (11) [1],[2] (1,975) [1],[2] (299) [1],[3]
Trading Account Assets [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
More significant transfers into Level 3 1,370 [1] 1,910 [1] 3,241 [1]
More significant transfers out of Level 3 (1,221) [1] (1,589) [1] (3,357) [1]
Available-for-sale Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
More significant transfers into Level 3 0 [1] 548 [1] 3,500
More significant transfers out of Level 3 (771) [1] (6,338) [1] (445) [1]
Loans and leases [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
More significant transfers into Level 3 450 [1],[4],[5] 5 [1],[4],[6] 0
More significant transfers out of Level 3 (11) [1],[4],[5] (4,386) [1],[4],[6] 0 [1],[7]
Derivative assets [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
More significant transfers into Level 3 (269) [1],[8] 1,199 [1],[9] 1,067 [1],[9]
More significant transfers out of Level 3 (461) [1],[8] (180) [1],[9] (525) [1],[9]
Fair Value, Measurements, Recurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans And Leases Fair Value Disclosure 9,002 8,804  
Loans held-for-sale 11,659 7,630  
Other Assets, Fair Value Disclosure 40,983 37,084  
Derivative assets 53,497 [10] 73,023 [10]  
Derivative liabilities included in net derivatives 46,016 [10] 59,520 [10]  
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Account Assets - Corporate Securities, Trading Loans and Other, Fair Value Disclosure 3,700    
Trading Account Assets - Mortgage Trading Loans and ABS, Fair Value Disclosure 4,900    
Available For Sale Securities - Other Taxable Securities, Fair Value Disclosure 3,900    
Available For Sale Debt Securities - Tax Exempt Securities, Fair Value Disclosure 1,100    
Loans And Leases Fair Value Disclosure 2,287 2,744  
Loans held-for-sale 2,733 3,387  
Other Assets, Fair Value Disclosure 3,129 4,235  
Derivative assets 8,073 [10] 14,366 [10] 18,800
Derivative liabilities included in net derivatives 6,605 [10] 8,500 [10] 11,000
Accrued Liabilities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gross Transfers into Level 3     0
Gross Transfers out of Level 3 4 [1],[5] (761) [1],[6]  
Long-term Debt [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gross Transfers into Level 3 2,040 [1],[5] 2,111 [1],[6] 1,881 [1],[6]
Gross Transfers out of Level 3 1,752 [1],[5] (1,576) [1],[6] 1,784 [1],[7]
Instruments Backed by Commercial Real Estate Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other Assets, Fair Value Disclosure 1,900    
Private Equity Investments and Funds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other Assets, Fair Value Disclosure $ 1,200    
[1] Assets (liabilities). For assets, increase / (decrease) to Level 3 and for liabilities, (increase) / decrease to Level 3.
[2] Other assets is primarily comprised of net monoline exposure to a single counterparty and private equity investments.
[3] Other assets is primarily comprised of AFS marketable equity securities.
[4] Issuances represent loan originations and mortgage servicing rights retained following securitizations or whole loan sales.
[5] During 2012, approximately $900 million was reclassified from Trading account assets - Corporate securities, trading loans and other to Trading account assets - Mortgage trading loans and ABS. In the table above, this reclassification is presented as a sale of Trading account assets - Corporate securities, trading loans and other and as a purchase of Trading account assets - Mortgage trading loans and ABS.
[6] Net derivatives include derivative assets of $14.4 billion and derivative liabilities of $8.5 billion.
[7] Net derivatives include derivative assets of $18.8 billion and derivative liabilities of $11.0 billion.
[8] Amounts represent instruments that are accounted for under the fair value option.
[9] Amounts represent instruments that are accounted for under the fair value option
[10] For further disaggregation of derivative assets and liabilities, see Note 3 – Derivatives.