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Business Developments, Risks And Uncertainties, And Liquidity (Tables)
9 Months Ended
Sep. 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

   $ 149       $ 41       $ (37)       $ (130)