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Operating Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Leases.      
Rent expense attributable to warehouse, office buildings and equipment operating leases $ 89 $ 115 $ 110
Minimum future rentals under operating leases      
2012 59    
2013 45    
2014 31    
2015 19    
2016 15    
2017 and thereafter $ 26