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Fair Value Measurement - Credit Adjustments Reflected on Balance Sheet (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Credit adjustments    
Derivative receivables balance $ 73,751 $ 74,983
Derivative payables 64,385 70,656
Structured Notes Balance Net Of DVA 47,630 48,112
Structured notes balance 46,759 47,012
Credit Valuation Adjustment [Member]
   
Credit adjustments    
Derivative receivables balance (3,357) (4,238)
Debit Valuation Adjustment
   
Credit adjustments    
Derivative payables (929) (830)
Structured notes balance (2,094) (1,712)
Plain Vanilla Financial Instruments [Member]
   
Credit adjustments    
Structured Notes Balance Net Of DVA $ 871 $ 1,100