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Inventories
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Inventories
7.      Inventories

Inventories comprise the following (in millions):
 
June 30,
2012
 
December 31,
2011
Finished goods
$
326
 
$
312
Work in process
  
234
 
  
199
Raw materials and accessories
  
230
 
  
268
Supplies and packing materials
  
209
 
  
196
Total inventories
$
999
 
$
975