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Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other intangible assets      
Gross Cost $ 1,914 $ 1,797  
Accumulated Amortization (1,269) (1,066)  
Net Cost 645 731  
Estimated amortization expense of the existing intangible assets      
2012   184  
2013   109  
2014   84  
2015   60  
2016   53  
Thereafter   155  
Total   645  
Other Intangible Assets (Textual) [Abstract]      
Amortization expense on capitalized software costs 33 30 20
Amortization expense 211 207 208
Technologies and licenses [Member]
      
Other intangible assets      
Gross Cost 882 827  
Accumulated Amortization (723) (609)  
Net Cost 159 218  
Contractual customer relationships [Member]
      
Other intangible assets      
Gross Cost 488 488  
Accumulated Amortization (171) (122)  
Net Cost 317 366  
Purchased software [Member]
      
Other intangible assets      
Gross Cost 358 309  
Accumulated Amortization (291) (256)  
Net Cost 67 53  
Construction in progress [Member]
      
Other intangible assets      
Gross Cost 87 82  
Accumulated Amortization 0 0  
Net Cost 87 82  
Other intangible assets [Member]
      
Other intangible assets      
Gross Cost 99 91  
Accumulated Amortization (84) (79)  
Net Cost $ 15 $ 12