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Acquisitions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Business Acquisitions Information    
Purchased finite-lived intangible assets $ 95  
Supplemental information:    
Cash paid, net of cash acquired 248 531
Maximum [Member]
   
Finite Lived Intangible Assets    
Acquired finite-lived intangible assets, life 15 years  
Minimum [Member]
   
Finite Lived Intangible Assets    
Acquired finite-lived intangible assets, life 2 years  
Weighted Average [Member]
   
Finite Lived Intangible Assets    
Acquired finite-lived intangible assets, life 12 years  
Federal Signal Technologies Group
   
Supplemental information:    
Purchase price 104  
Ceradyne Inc.
   
Supplemental information:    
Estimated future purchase price 860  
Estimated future purchase price net of cash, cash equivalents, short term investments and debt acquired $ 670  
Business acquisition share price (in dollars per share) $ 35.00