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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Derivative [Line Items]          
Increase (Decrease) to Earnings Related to Change in Methodology for Calculating Derivative Valuation Adjustments     $ 72,000,000    
Net Credit Valuation Adjustment Gain (Loss), Excluding Impact of Change in Calculation Methodology     128,000,000    
Net Debit Valuation Adjustment (Gain) Loss, Excluding Impact of Change in Calculation Methodology     15,000,000    
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets 143,000,000 [1] (313,000,000) [1] 12,000,000 [1] 200,000,000 [1]  
Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits For Counterparty Credit Risk 62,000,000 [1] 13,000,000 [1] (233,000,000) [1] 162,000,000 [1]  
Decrease in Derivative Asset Value Related to Cumulative Counterparty Credit Risk Valuation 2,300,000,000   2,300,000,000   2,400,000,000
Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity's Credit Quality 77,000,000 [2] 67,000,000 [2] 452,000,000 [2] (1,293,000,000) [2]  
Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits Losses 39,000,000 (158,000,000) 418,000,000 (1,617,000,000)  
Decrease in Derivative Liability Value Related to Cumulative Counterparty Credit Risk Valuation 1,300,000,000   1,300,000,000   807,000,000
CVA Change in Calculation Methodology [Member]
          
Derivative [Line Items]          
Credit Valuation Gains (Losses) in Derivative Asset Value Related to Change in Calculation Methodology     361,000,000    
DVA Change in Calculation Methodology [Member]
          
Derivative [Line Items]          
Increase (Decrease) in Derivative Valuation Adjustment Related to Change in Calculation Methodology     $ 433,000,000    
[1] At June 30, 2013 and December 31, 2012, the cumulative CVA reduced the derivative assets balance by $2.3 billion and $2.4 billion.
[2] At June 30, 2013 and December 31, 2012, the cumulative DVA reduced the derivative liabilities balance by $1.3 billion and $807 million.