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Contingencies and commitments (Tables)
12 Months Ended
Dec. 31, 2011
Contingencies and commitments [Abstract]  
Minimum future rental commitments under non-cancelable operating leases
         

2012

  $ 116  

2013

    104  

2014

    85  

2015

    76  

2016

    65  

Thereafter

    328  
   

 

 

 

Total minimum operating lease commitments

  $ 774