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Acquisitions and Dispositions (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Business
Dec. 31, 2010
Business
Feb. 06, 2012
Oct. 28, 2011
Sep. 17, 2010
Jan. 30, 2009
Acquisitions and Dispositions (Textual)            
Aggregate purchase price of acquisition $ 18 $ 755 $ 210      
Amount of goodwill recognized 19 533       56
Number of businesses acquired 2 4        
Goodwill deductible for income tax purposes 14 474        
Maximum contingent consideration related to acquisition       10 11  
Fair value of the contingent consideration 16 9   7 9  
Purchase price of acquisition of all outstanding stock of CSC           91
Net working capital adjustment (of which $6 million was for cash acquired)           7
Cash acquired           6
Certain tax benefits acquired           4
Amount of loss on sale of business 2 1        
Annual revenue from business $ 8 $ 4