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Acquisitions and Divestitures (Divestitures) (Details Textual) (LinkedIn [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
LinkedIn [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Pretax gain related to sale of business $ 13 $ 13