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Segment Information (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Assets      
Total assets: $ 8,488 $ 8,419 $ 8,517
Reportable Segment Totals
     
Assets      
Total assets: 8,235 8,121 8,225
Europe
     
Assets      
Total assets: 3,585 3,509 3,263
North America
     
Assets      
Total assets: 2,055 1,995 2,030
South America
     
Assets      
Total assets: 1,453 1,467 1,638
Asia Pacific
     
Assets      
Total assets: 1,142 1,150 1,294
Other
     
Assets      
Total assets: $ 253 $ 298 $ 292