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Business Developments, Risks and Uncertainties, and Liquidity (Tables)
6 Months Ended
Jun. 30, 2012
Change In Credit Spreads (Asset/Liability Products Business)
                                           
     Change in Credit Spreads (Asset/Liability Products Business)  

In millions

   200 Basis Point
Decrease
     50 Basis Point
Decrease
     50 Basis Point
Increase
     200 Basis Point
Increase
 

Estimated change in fair value

   $ 174       $ 54       $ (49)       $ (173)