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Segment Information (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Assets      
Total assets: $ 8,410 $ 8,598 $ 8,834
Reportable Segment Totals
     
Assets      
Total assets: 8,154 8,360 8,500
Europe
     
Assets      
Total assets: 3,452 3,362 3,544
North America
     
Assets      
Total assets: 2,029 1,994 2,055
South America
     
Assets      
Total assets: 1,495 1,655 1,583
Asia Pacific
     
Assets      
Total assets: 1,178 1,349 1,318
Other
     
Assets      
Total assets: $ 256 $ 238 $ 334