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Mortgage Servicing Assets (Tables)
6 Months Ended
Jun. 30, 2012
Mortgage Servicing Assets [Abstract]  
Changes in the carrying amount of mortgage servicing assets
                 
              Six months ended June  30,  
in millions   2012     2011  

 

 

Balance at beginning of period

    $ 173        $ 196   

Servicing retained from loan sales

    20        11   

Purchases

    24         

Amortization

    (29)       (29)  

Impairments

    (2)       —   

 

 

Balance at end of period

    $ 186        $ 180   
   

 

 

   

 

 

 

 

 

Fair value at end of period

    $             237        $             247