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Property and Equipment
12 Months Ended
Dec. 31, 2011
Property and Equipment [Abstract]  
Property and Equipment
(5) Property and Equipment
 
Property and equipment included in other assets were as follows:
 
                 
    December 31  
    2011     2010  
    (in millions)  
 
Cost
  $ 589     $ 634  
Accumulated depreciation
    306       337  
                 
    $ 283     $ 297  
                 
 
Depreciation expense related to property and equipment was $58 million, $63 million and $69 million for 2011, 2010 and 2009, respectively.