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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Y
Acquisition
Jun. 30, 2011
Dec. 31, 2011
Avery Dennison Corp
Jun. 30, 2012
Federal Signal Technologies Group
Business Acquisitions Information        
Purchased finite-lived intangible assets $ 60      
Supplemental information:        
Cash paid, net of cash acquired 144 487    
Acquired finite-lived intangible assets, weighted-average life (in years) 14      
Acquired finite-lived intangible assets life, low end of range (in years) 2      
Acquired finite-lived intangible assets life, high end of range (in years) 15      
Expected purchase price     $ 550 $ 110
Number of acquisitions announced that are expected to be completed in remainder of current year 2