Quarterly report pursuant to Section 13 or 15(d)

Derivatives - Derivative Valuation Adjustments (Details)

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Derivatives - Derivative Valuation Adjustments (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]          
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets $ 525,000,000 [1] $ (1,570,000,000) [1] $ 725,000,000 [1] $ (2,014,000,000) [1]  
Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits For Counterparty Credit Risk 75,000,000 [1] (81,000,000) [1] 237,000,000 [1] (698,000,000) [1]  
Decrease in Derivative Asset Value Related to Cumulative Counterparty Credit Risk Valuation 2,700,000,000   2,700,000,000   2,800,000,000
Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity's Credit Quality (606,000,000) [2] 1,767,000,000 [2] (1,899,000,000) [2] 1,664,000,000 [2]  
Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits Losses (583,000,000) [2] 1,710,000,000 [2] (2,200,000,000) [2] 1,474,000,000 [2]  
Decrease in Derivative Liability Value Related to Cumulative Counterparty Credit Risk Valuation 1,100,000,000   1,100,000,000   2,400,000,000
Counterparty Credit Risk Valuation Adjustment [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets 175,000,000        
Debit Valuation Adjustment [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity's Credit Quality 171,000,000        
Net Earnings Impact Of Refinement of Estimate [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets $ 4,000,000        
[1] At September 30, 2012 and December 31, 2011, the cumulative CVA reduced the derivative assets balance by $2.7 billion and $2.8 billion.
[2] At September 30, 2012 and December 31, 2011, the Corporation’s cumulative DVA reduced the derivative liabilities balance by $1.1 billion and $2.4 billion.