Quarterly report pursuant to Section 13 or 15(d)

Securities Financing Transactions (Details)

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Securities Financing Transactions (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Collateral Received that Can be Resold or Repledged [Abstract]    
Fair value of securities received as collateral that can be resold or repledged $ 475,000,000,000 $ 500,000,000,000
Fair value of securities received as collateral that have been resold or repledged 376,000,000,000 405,000,000,000
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 39,498,000,000 70,059,000,000
Equities and convertible debentures
    
Collateral Received that Can be Resold or Repledged [Abstract]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 11,169,000,000 11,732,000,000
Corporate debt and preferred stock
    
Collateral Received that Can be Resold or Repledged [Abstract]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 5,867,000,000 8,368,000,000
U.S. Government and agencies
    
Collateral Received that Can be Resold or Repledged [Abstract]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 17,481,000,000 41,236,000,000
Non-U.S. governments and agencies
    
Collateral Received that Can be Resold or Repledged [Abstract]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 2,056,000,000 1,707,000,000
Mortgages, mortgage-backed, and asset-backed securities
    
Collateral Received that Can be Resold or Repledged [Abstract]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 2,190,000,000 4,547,000,000
Municipals and money markets
    
Collateral Received that Can be Resold or Repledged [Abstract]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty $ 735,000,000 $ 2,469,000,000