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Fair Value Measurement - Credit Adjustments Reflected on Balance Sheet (Details 5) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Credit adjustments    
Derivative receivables balance $ 85,010 $ 92,477
Derivative Liabilities 74,767 74,977
Structured notes balance 50,894 49,229
Credit Valuation Adjustment [Member]
   
Credit adjustments    
Derivative receivables balance (5,475) (6,936)
Debit Valuation Adjustment [Member]
   
Credit adjustments    
Derivative Liabilities (981) (1,420)
Structured notes balance $ (1,584) $ (2,052)