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Segment Information (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Assets      
Total assets: $ 8,591 $ 8,419 $ 8,410
Reportable Segment Totals
      
Assets      
Total assets: 8,317 8,121 8,154
Europe
      
Assets      
Total assets: 3,667 3,509 3,452
North America
      
Assets      
Total assets: 2,087 1,995 2,029
South America
      
Assets      
Total assets: 1,436 1,467 1,495
Asia Pacific
      
Assets      
Total assets: 1,127 1,150 1,178
Other
      
Assets      
Total assets: $ 274 $ 298 $ 256